Article: 95428 of rec.radio.amateur.homebrew From: "Paul M0EME" Subject: HF Linear Date: Mon, 12 Dec 2005 20:44:28 -0000 Message-ID: <439de12d_4@mk-nntp-2.news.uk.tiscali.com> Im building a HF linear using four PL519's. Can i use 2oz copper PCB for the base to fit the valves too?????? as Im not very good at cutting and messing with metal. -- Thanks and 73's de Paul M0EME 432MHz EME 4 times FO19, FT847, MGF1302, 100 Watts at feed, Spectran. Initials 432MHz #2 CW #4 JT65 http://myweb.tiscali.co.uk/m0eme Article: 95429 of rec.radio.amateur.homebrew From: "Salvador Ferrairo" References: <439bfed0_2@x-privat.org> <439cb3be$1_3@x-privat.org> Subject: Re: Marker precision on a HB8592B (HP859xb series) Message-ID: <439e1a51$1_1@x-privat.org> Date: 13 Dec 2005 01:48:17 +0100 Rigth, so if in doing the measurement of frecuency at 300 Mhz with a span of 500Khz I get say 299.870 my unit is OK, rigth ? I don't see those big errors of 5 Mhz. Any pointers to the user manualfor that unit ? Salva "John Miles" escribió en el mensaje news:MPG.1e077b6cfe284b5b989710@news-central.giganews.com... > In article , folder0735@hotmail.com > says... >> >> "Salvador Ferrairo" wrote in message >> news:439cb3be$1_3@x-privat.org... >> > Rigth, I have seen that info, (0.01% of center freqency + 2% of >> > freqency >> > span + 5 x N MHz), but I quite don't understand it ... >> > >> > If say I am measuring a 300 Mhz signal, and I have a span of say 500 >> > Khz.. >> > >> > - What is the precision or error that I can expect ? >> > >> > Any hands on experience with that spectrum analizer, and in special >> > regarding frecuency marker precision, will be welcomed. >> > > > N is the 1st LO harmonic used for the front-end conversion. It is > always 1 for any frequency in the first band of coverage, so the > tolerance at 300 MHz would be +/- 5.055 MHz. > > -- jm > > ------------------------------------------------------ > http://www.qsl.net/ke5fx > Note: My E-mail address has been altered to avoid spam > ------------------------------------------------------ Article: 95430 of rec.radio.amateur.homebrew From: "KC0EH" Subject: WTB: 222MHz. TRANSVERTER Message-ID: Date: Mon, 12 Dec 2005 18:56:00 -0600 I am interested in buying a 222 transverter to get on SSB/CW. Also interested in amplifier and antennas. Please state price and condition. Thanks, ...Charlie...KC0EH... Article: 95431 of rec.radio.amateur.homebrew From: "Dale Parfitt" Subject: Test Equipment F.A. Message-ID: Date: Tue, 13 Dec 2005 01:33:19 GMT HP 3200B 10-500 MHz Signal generator: http://cgi.ebay.com/HEWLETT-PACKARD-HP-HP-3200B-SIGNAL-GENERATOR_W0QQitemZ7571603260QQcategoryZ97198QQssPageNameZWDVWQQrdZ1QQcmdZViewItem Systron Donner 3 GHz Freq Counter: http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&ssPageName=ADME:L:LCA:US:31&item=7571706367 Tektronix 60 MHz dual trace Scope: http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&ssPageName=ADME:L:LCA:US:31&item=7571701396 Article: 95432 of rec.radio.amateur.homebrew From: Allodoxaphobia Subject: Re: Linear amplifier chain choices Date: 13 Dec 2005 02:52:02 GMT Message-ID: References: <1134379854.649360.281900@o13g2000cwo.googlegroups.com> <1134438708.307256.144980@g43g2000cwa.googlegroups.com> On 12 Dec 2005 17:51:48 -0800, eternalsquire@comcast.net wrote: > Have you put up a page for the design? Does *who* have *what* page up for *which* design. SHEESH!! These sloppy-assed Goggle followups will be the death of usenet. http://oakroadsystems.com/genl/unice.htm#quote http://groups.google.com/googlegroups/posting_style.html#summarize Article: 95433 of rec.radio.amateur.homebrew Message-ID: <439E66AB.F529BA9D@earthlink.net> From: "Michael A. Terrell" Subject: Re: Linear amplifier chain choices References: <1134379854.649360.281900@o13g2000cwo.googlegroups.com> <1134438708.307256.144980@g43g2000cwa.googlegroups.com> Date: Tue, 13 Dec 2005 06:14:15 GMT Allodoxaphobia wrote: > > On 12 Dec 2005 17:51:48 -0800, eternalsquire@comcast.net wrote: > > Have you put up a page for the design? > > Does *who* have *what* page up for *which* design. > > SHEESH!! > These sloppy-assed Goggle followups will be the death of usenet. > > http://oakroadsystems.com/genl/unice.htm#quote > http://groups.google.com/googlegroups/posting_style.html#summarize You can always killfile everything from Google groups. -- ? Michael A. Terrell Central Florida Article: 95434 of rec.radio.amateur.homebrew Message-ID: <439E6768.63163AD@earthlink.net> From: "Michael A. Terrell" Subject: Re: can a picture tube be used as an RF amplifier? References: <1134439035.590187.148060@z14g2000cwz.googlegroups.com> Date: Tue, 13 Dec 2005 06:17:24 GMT eternalsquire@comcast.net wrote: > > Hi, > > I get a lot of broken TV's for scrapping from time to time, and it > seems that just getting > rid of the tube in the trash is a shameful waste. But I do know that > these are about the > only remaining vaccum tubes still in manufacture in this country. I > understand that most > of the power is supposed to go through the electron gun of the tube, > but I wonder if the > electron gun could be reconfigured as a linear final? Bad idea? > > The Eternal Squire Based on the filament power, how much output do you expect to get? -- ? Michael A. Terrell Central Florida Article: 95435 of rec.radio.amateur.homebrew From: "Reg Edwards" Subject: Re: How high Q can we expect from a coax? Date: Tue, 13 Dec 2005 14:43:58 +0000 (UTC) Message-ID: References: <1134471484.165479.119440@g43g2000cwa.googlegroups.com> > Anyone has any information on how high Q can we expect from an open or > a short quater wavelength coaxial stub? How can we achieve moderately > high (200-300) Q by using a coax stub? ============================================ Program COAXTUNE calculates Q when the line is tuned to resonance by a capacitor across the open end. For practical purposes this is the same as Q when off-resonance at the same frequency. Open-circuit and-short circuit stub lines have the same Q. As a check on dimensions of the inner and outer conductors the program calculates line impedance Zo. If you are uncertain of dimensions then vary them to make Zo equal to what particular type of line you have in mind. The velocity factor of solid polyethylene coax is 0.665 The program allows physical line length to be adjusted for resonance at any frequency, and for any length in wavelengths. At HF, for typical types and sizes of coax, you will find Q to be very much lower than 200 or 300. High values of Q are obtainable only at UHF and above on large diameter lines. Download program COAXTUNE from website below. It is very simple to use. Program TWINTUNE does similar things with balanced pair lines. For design of a complete impedance matching system using a stub-line, coax or balanced-twin, between main line and antenna, program STUMATCH may be of interest. ---- ........................................................... Regards from Reg, G4FGQ For Free Radio Design Software go to http://www.btinternet.com/~g4fgq.regp ........................................................... Article: 95436 of rec.radio.amateur.homebrew From: nospam@nouce.bellatlantic.net Subject: Re: How high Q can we expect from a coax? Message-ID: <7jptp1d16mek1onbhe15b450ed32grhp33@4ax.com> References: <1134471484.165479.119440@g43g2000cwa.googlegroups.com> Date: Tue, 13 Dec 2005 15:21:21 GMT On 13 Dec 2005 02:58:04 -0800, "somphopv@yahoo.com" wrote: >Anyone has any information on how high Q can we expect from an open or >a short quater wavelength coaxial stub? How can we achieve moderately >high (200-300) Q by using a coax stub? the uncomplicate answer is "depends on the COAX losses which is related to inner conductor diameter and insulator used". Example RG58 is a poorer than UT141 but 1" Hardline will be better. Tools like coaxtune and others will get you a better ide of what will achieve your specific goals. Allison Article: 95437 of rec.radio.amateur.homebrew Message-ID: <439EF3AF.CB09B286@earthlink.net> From: "Michael A. Terrell" Subject: Re: can a picture tube be used as an RF amplifier? References: <1134439035.590187.148060@z14g2000cwz.googlegroups.com> <1134475164.205755.24290@g47g2000cwa.googlegroups.com> Date: Tue, 13 Dec 2005 16:16:12 GMT "Saandy , 4Z5KS" wrote: > > usualy the electron gun is designed to generate a few tens of > microamperes of current. i don't suppose you'll get the full legal > power from it! I doubt that he would get more than a couple watts out of a CRT, even if it has 30 KV on the second anode. The ICs used to drive a computer monitor's CRT, on the other hand? Some will work on two meters, and higher frequencies and can be found in dead monitors all over the place. -- ? Michael A. Terrell Central Florida Article: 95438 of rec.radio.amateur.homebrew From: Allodoxaphobia Subject: Re: Linear amplifier chain choices Date: 13 Dec 2005 19:53:10 GMT Message-ID: References: <1134379854.649360.281900@o13g2000cwo.googlegroups.com> <1134438708.307256.144980@g43g2000cwa.googlegroups.com> <439E66AB.F529BA9D@earthlink.net> On Tue, 13 Dec 2005 06:14:15 GMT, Michael A. Terrell wrote: > Allodoxaphobia wrote: >> >> On 12 Dec 2005 17:51:48 -0800, eternalsquire@comcast.net wrote: >> > Have you put up a page for the design? >> >> Does *who* have *what* page up for *which* design. >> >> SHEESH!! >> These sloppy-assed Goggle followups will be the death of usenet. >> >> http://oakroadsystems.com/genl/unice.htm#quote >> http://groups.google.com/googlegroups/posting_style.html#summarize > > You can always killfile everything from Google groups. Iive started doing that -- on a ng-by-ng basis -- when it appears to Get Out Of Control. Now it looks like I need to start killfiling the google followups in the rec.radio.amateur.* collection. It's so frustrating to follow some 'interesting' thread over a period of days and be forced to stumble through a number of thoughtless, disembodied followups. sigh... Article: 95439 of rec.radio.amateur.homebrew From: Allodoxaphobia Subject: Re: How high Q can we expect from a coax? Date: 13 Dec 2005 19:55:52 GMT Message-ID: References: <1134471484.165479.119440@g43g2000cwa.googlegroups.com> On 13 Dec 2005 02:58:04 -0800, somphopv@yahoo.com wrote: > Anyone has any information on how high Q can we expect from an open or > a short quater wavelength coaxial stub? How can we achieve moderately > high (200-300) Q by using a coax stub? Something like a 2" copper pipe centered in a metal garbage can? Or, 19" of RG-174? Jonesy Article: 95440 of rec.radio.amateur.homebrew Message-ID: <439F3E0D.38B686C3@earthlink.net> From: "Michael A. Terrell" Subject: Re: Linear amplifier chain choices References: <1134379854.649360.281900@o13g2000cwo.googlegroups.com> <1134438708.307256.144980@g43g2000cwa.googlegroups.com> <439E66AB.F529BA9D@earthlink.net> Date: Tue, 13 Dec 2005 21:33:40 GMT Allodoxaphobia wrote: > > I've started doing that -- on a ng-by-ng basis -- when it appears to Get > Out Of Control. Now it looks like I need to start killfiling the google > followups in the rec.radio.amateur.* collection. > > It's so frustrating to follow some 'interesting' thread over a period of > days and be forced to stumble through a number of thoughtless, > disembodied followups. > > sigh... I know what you mean. Take a look at news:sci.electronics.design sometime at all the off topic questions and flame wars. -- ? Michael A. Terrell Central Florida Article: 95441 of rec.radio.amateur.homebrew From: "Dale Parfitt" References: <1134520239.071671.96720@g44g2000cwa.googlegroups.com> Subject: Re: What Does Your Electronics Workshop Look Like? Message-ID: Date: Wed, 14 Dec 2005 01:10:56 GMT "Too_Many_Tools" wrote in message news:1134520239.071671.96720@g44g2000cwa.googlegroups.com... > With the holiday season here it is time to redo the workshop and the > workbench in particular. > > So, what suggestions do you have for setting up a good efficient > workspace for electronics? > > Here's an example that I found.... > > http://www.stevenjohnson.com/workbench.htm > > So what does your workspace, test bench and layout look like? > > Pictures and links would be great. > > What has worked for you?...what hasn't? > > Benches, racks, cabinets, tables, carts.... > > Any particular test equipment that you would recommend for or against? > > Thanks > > TMT Here's a couple pix of my shop. For test equipment- stick with the knowns- HP/Agielnt, Tektronix etc. http://www.w4dex.com/gallery/Dale-Parfitt/Dale_Parfitt_W4OP http://www.w4dex.com/gallery/Dale-Parfitt/Dale_Parfitt_W4OP_3 W4OP > Article: 95442 of rec.radio.amateur.homebrew Message-ID: <439F781E.5B795175@earthlink.net> From: "Michael A. Terrell" Subject: Re: What Does Your Electronics Workshop Look Like? References: <1134520239.071671.96720@g44g2000cwa.googlegroups.com> <439F7477.9ECE0621@shaw.ca> Date: Wed, 14 Dec 2005 01:41:39 GMT Irv Finkleman wrote: > > If I ever manage to get to the point where I can find the bench > underneath the clutter I will be more than happy to send you a photo > of it. I should have taken one when it was new for sentimental > reasons! :-) > > Irv VE6BP > > P.S. If you think the bench is bad, you should see the shack! news:alt.binary.pictures.radio has a contest from time to time with pictures of workbenches and home shops. Its about time for someone to post another "My bench" photo and start another round over there. -- ? Michael A. Terrell Central Florida Article: 95443 of rec.radio.amateur.homebrew From: "Arfa Daily" References: <1134520239.071671.96720@g44g2000cwa.googlegroups.com> Subject: Re: What Does Your Electronics Workshop Look Like? Message-ID: Date: Wed, 14 Dec 2005 01:46:30 GMT "Tim Wescott" wrote in message news:gLydnT-cMZJR7ALeRVn-vA@web-ster.com... > Too_Many_Tools wrote: >> With the holiday season here it is time to redo the workshop and the >> workbench in particular. >> >> So, what suggestions do you have for setting up a good efficient >> workspace for electronics? >> >> Here's an example that I found.... >> >> http://www.stevenjohnson.com/workbench.htm >> >> So what does your workspace, test bench and layout look like? >> >> Pictures and links would be great. >> >> What has worked for you?...what hasn't? >> >> Benches, racks, cabinets, tables, carts.... >> >> Any particular test equipment that you would recommend for or against? >> >> Thanks >> >> TMT >> > My workbench looks like an absolute fright unless I've been very > unproductive (and therefore have had time to clean), or I've reached a > standstill (and therefore must clean). > > Otherwise I just look at the pile and ask myself how long ago I used a > particular tool, then I look that far down to find it. > > -- > > Tim Wescott > Wescott Design Services > http://www.wescottdesign.com Oh deep joy !!! That is a perfect description of my workshop. I wish I could keep it looking like the pictures in the post above. I have as much benchspace, but on an average day, probably about 18" to 2 foot available ... On another similar sized bench behind me, I have one of the workshop computers, the weather sat receiving equipment, and my amateur radio station. On that bench, on a good day, there's just about room for the station logbook ! Arfa Article: 95444 of rec.radio.amateur.homebrew From: "Jeff L" References: <1134520239.071671.96720@g44g2000cwa.googlegroups.com> Subject: Re: What Does Your Electronics Workshop Look Like? Message-ID: <8vLnf.139159$Ph4.4254769@ursa-nb00s0.nbnet.nb.ca> Date: Wed, 14 Dec 2005 02:32:36 GMT "Spehro Pefhany" wrote in message news:sqvup15ojgkave2s0seqhbf9tka5b2fqsn@4ax.com... > On Wed, 14 Dec 2005 01:10:56 GMT, the renowned "Dale Parfitt" > wrote: > > > >Here's a couple pix of my shop. For test equipment- stick with the knowns- > >HP/Agielnt, Tektronix etc. > >http://www.w4dex.com/gallery/Dale-Parfitt/Dale_Parfitt_W4OP > >http://www.w4dex.com/gallery/Dale-Parfitt/Dale_Parfitt_W4OP_3 > > > >W4OP > > Nice and neat. What are those cool vertical outlet boxes-- a > commercial product? > Those look like part of the bench - I know some of the brands of benches available used to have the plugs there. My benches have a 6' strip with plugs every 3 - 4" that we bought from I believe Tripp Lite last summer. They were quite reasonable with a lighted, covered switch, circuit breaker, a 10 to 15' long heavy grounded cord, with a nice extruded aluminum housing for ~$70 CND @ something like 7 qty. They make many styles and lengths. Jeff > What kind of a critter lives in that bed beside the Tek scope? > > > Best regards, > Spehro Pefhany > -- > "it's the network..." "The Journey is the reward" > speff@interlog.com Info for manufacturers: http://www.trexon.com > Embedded software/hardware/analog Info for designers: http://www.speff.com Article: 95445 of rec.radio.amateur.homebrew From: jpero@sympatico.ca (Jason D.) Subject: Re: What Does Your Electronics Workshop Look Like? Message-ID: <439f8780.198399453@news1.on.sympatico.ca> References: <1134520239.071671.96720@g44g2000cwa.googlegroups.com> Date: Wed, 14 Dec 2005 02:57:16 GMT On 13 Dec 2005 16:30:39 -0800, "Too_Many_Tools" wrote: >With the holiday season here it is time to redo the workshop and the >workbench in particular. > >So, what suggestions do you have for setting up a good efficient >workspace for electronics? > Size of stuff to fix upon determines the design of bench and tools. I'm TV tech; Big ones like 36'ers demands at least 5 feet by 10 even more feet bench to allow for tools to lay besides the unit. I have wished I had that because of few CTC210/DTV306/etc that needed the depth so I can push the unit way forward so I can eagle spread the crowded chassis that weighs a tonne and clumsy to handle just to freaking replace 10 parts in worst places. Lot of chassis flipping just to see as you put new parts in and remove and resolder transformer for that R14609 tiny 10 ohm resistor that's now a black crater, that D14611 did to components in standby SMPS. Be make sure the bench is high enough so you don't bend over so low but not too high to heft heavy TV up there. Flat CRTs are heavy! Cheers, Wizard Article: 95446 of rec.radio.amateur.homebrew Message-ID: <439FA234.396EE28E@earthlink.net> From: "Michael A. Terrell" Subject: Re: What Does Your Electronics Workshop Look Like? References: <1134520239.071671.96720@g44g2000cwa.googlegroups.com> <1134534650.642653.280610@g14g2000cwa.googlegroups.com> Date: Wed, 14 Dec 2005 04:41:22 GMT meow2222@care2.com wrote: > > The one thing I avoided like the plague, and still do, is those plastic > drawer racks with often open top drawer boxes. You've only got to move > one once to see what I mean! One spill and you'll never ever buy one > again. Small parts containers must have burst proof latches, I wont use > any that dont. I moved over 1000 miles in 1987 and I had 24 50 drawer Akro-Mills cabinets full of parts. I cut pieces of cardboard to cover the front and placed two of them face to face, then taped them together. I didn't have even one part out of place when I arrived at my new place and set up my shop. The move was done with my shop's step van and I hauled over 17,000 pounds of tools, parts, manuals and test equipment in two trips. there is nothing wrong with parts cabinets, if you know how to pack them. -- ? Michael A. Terrell Central Florida Article: 95447 of rec.radio.amateur.homebrew From: "Mr Fed UP" References: <1134520239.071671.96720@g44g2000cwa.googlegroups.com> <439f8780.198399453@news1.on.sympatico.ca> Subject: Re: What Does Your Electronics Workshop Look Like? Message-ID: Date: Tue, 13 Dec 2005 23:10:21 -0600 Gee Whizz this 36 inch I have weighs in at 200 pounds. Maybe you need to think about a motor hoist with straps or something. I know by myself this TV will never be moved. Maybe it can sell with the house some day. Good luck with the hernias. I have a 12 X 24 patio I am thinking of enclosing and making a shop... so I am following this thread too. lol where ever it goes K4TWO Gary "Jason D." wrote in message news:439f8780.198399453@news1.on.sympatico.ca... > On 13 Dec 2005 16:30:39 -0800, "Too_Many_Tools" > wrote: > >>With the holiday season here it is time to redo the workshop and the >>workbench in particular. >> >>So, what suggestions do you have for setting up a good efficient >>workspace for electronics? >> > > Size of stuff to fix upon determines the design of bench and tools. > > I'm TV tech; > Big ones like 36'ers demands at least 5 feet by 10 even more feet > bench to allow for tools to lay besides the unit. I have wished I had > that because of few CTC210/DTV306/etc that needed the depth so I can > push the unit way forward so I can eagle spread the crowded chassis > that weighs a tonne and clumsy to handle just to freaking replace 10 > parts in worst places. Lot of chassis flipping just to see as you put > new parts in and remove and resolder transformer for that R14609 tiny > 10 ohm resistor that's now a black crater, that D14611 did to > components in standby SMPS. > > Be make sure the bench is high enough so you don't bend over so low > but not too high to heft heavy TV up there. Flat CRTs are heavy! > > Cheers, Wizard Article: 95448 of rec.radio.amateur.homebrew Message-ID: <439FAFDB.4ABD655A@earthlink.net> From: "Michael A. Terrell" Subject: Re: What Does Your Electronics Workshop Look Like? References: <1134520239.071671.96720@g44g2000cwa.googlegroups.com> Date: Wed, 14 Dec 2005 05:39:44 GMT COLIN LAMB wrote: > > The last time my bench was clean was over a decade ago - after I learned I > had a very aggressive form of cancer. I reluctantly cleaned off the bench > to save my wife from having to do it. > > But, through the miracles of drugs, the cancer went away. Now, my desks are > all cluttered again. My wife fondly talks about how good life was when my > desk was clean and I had sold much of my junk. I think she is kidding, but > would not bet my life on it. > > When I clean an area, it is only temporary. > > At the constant prodding of my wife, I spend 3 months cleaning up the floor > of my darkroom. I found things that had been missing for years. But, I > could not clean up the desk, for it has all the little parts for which I do > not have a place for. > > In the end, messiness is really just the product of someone who has so much > order that he insists upon a place for each item before he puts it away. > > Colin K7FM A workbench is meant to be a living example of the moving hole theory. ;-) -- ? Michael A. Terrell Central Florida Article: 95449 of rec.radio.amateur.homebrew From: James Sweet Subject: Re: What Does Your Electronics Workshop Look Like? References: <1134520239.071671.96720@g44g2000cwa.googlegroups.com> Message-ID: Date: Wed, 14 Dec 2005 08:07:03 GMT Too_Many_Tools wrote: > With the holiday season here it is time to redo the workshop and the > workbench in particular. > > So, what suggestions do you have for setting up a good efficient > workspace for electronics? > > Here's an example that I found.... > > http://www.stevenjohnson.com/workbench.htm > > So what does your workspace, test bench and layout look like? > > Pictures and links would be great. > > What has worked for you?...what hasn't? > > Benches, racks, cabinets, tables, carts.... > > Any particular test equipment that you would recommend for or against? > > Thanks > > TMT > That's an amazing shop. My own is unfortunately nothing like it, far more cluttered with junk piled all over the place, I suspect it's typical of other hobby techs here. Article: 95450 of rec.radio.amateur.homebrew From: xray Subject: Re: What Does Your Electronics Workshop Look Like? Date: Wed, 14 Dec 2005 02:54:57 -0800 Message-ID: References: <1134520239.071671.96720@g44g2000cwa.googlegroups.com> On Wed, 14 Dec 2005 01:10:56 GMT, "Dale Parfitt" wrote: > >"Too_Many_Tools" wrote in message >news:1134520239.071671.96720@g44g2000cwa.googlegroups.com... >> With the holiday season here it is time to redo the workshop and the >> workbench in particular. >> >> So, what suggestions do you have for setting up a good efficient >> workspace for electronics? >> >> Here's an example that I found.... >> >> http://www.stevenjohnson.com/workbench.htm >> >> So what does your workspace, test bench and layout look like? >> >> Pictures and links would be great. >> >> What has worked for you?...what hasn't? >> >> Benches, racks, cabinets, tables, carts.... >> >> Any particular test equipment that you would recommend for or against? >> >> Thanks >> >> TMT > >Here's a couple pix of my shop. For test equipment- stick with the knowns- >HP/Agielnt, Tektronix etc. >http://www.w4dex.com/gallery/Dale-Parfitt/Dale_Parfitt_W4OP >http://www.w4dex.com/gallery/Dale-Parfitt/Dale_Parfitt_W4OP_3 > >W4OP >> > Wow. You guys are amazingly neat. I always liked the cover of this book... http://www.kelvin.com/Merchant2/merchant.mv?Screen=PROD&Product_Code=651162 (Best picture of the cover that I could find quickly.) Probably hard to make out the details in that web picture, but the bench comes equipped with a crushed can of Mr. Pibb, and empty bag of Chips, and a tipped cup of Coffee (and a bunch of electronic stuff.) That's more like what my benches usually look like. Article: 95451 of rec.radio.amateur.homebrew From: fmmck@aol.com (Fred McKenzie) Subject: Re: Is magnetic field affected by metal conductor? Date: Tue, 13 Dec 2005 14:16:10 -0500 Message-ID: References: <1134395344.665561.302220@f14g2000cwb.googlegroups.com> In article , "Steve Nosko" wrote: > A changing magnetic field induces current in a conductor which in > turn causes a magnetic field that opposes the original magnetic field. This > new magnetic field sums with the original to form a completely new magnetic > field. Conversely, a moving conductor interacts with a static magnetic field. Fred Article: 95452 of rec.radio.amateur.homebrew From: cas@w-sherwood.ih.lucent.com (Chuck Sherwood) Subject: Help with Heath SB200 Date: 14 Dec 2005 15:04:47 GMT Message-ID: I have a Heath SB200 that has been modified a bit too much. Someone replaced the stock fan with a muffin fan and they cut a big hole for the fan in the RF chamber. I want to replace the muffin fan with a fan resembling the stock fan. Grainger sells motor and fan blades for appliances that look close enough. I just need some data to choose the right one. Most import is the fan blade size. Second would be any specs for the motor. Stock motors range from 1/500Hp to 1/20 HP. I suspect one of the smallers one based on physical size. Also the meter seems to stick in a couple spots. I don't see anything obvious like a bent needle. Any hope of finding a similar meter that I can move the faceplate? Any place that can repair meters? All help appreciated. thanks chuck Article: 95453 of rec.radio.amateur.homebrew From: "Mike Andrews" Subject: Re: What Does Your Electronics Workshop Look Like? Date: Wed, 14 Dec 2005 16:40:41 +0000 (UTC) Message-ID: References: <1134520239.071671.96720@g44g2000cwa.googlegroups.com> In rec.radio.amateur.boatanchors Dale Parfitt wrote: > Here's a couple pix of my shop. For test equipment- stick with the knowns- > HP/Agielnt, Tektronix etc. > http://www.w4dex.com/gallery/Dale-Parfitt/Dale_Parfitt_W4OP > http://www.w4dex.com/gallery/Dale-Parfitt/Dale_Parfitt_W4OP_3 In W4OP_2, what's the rightmost gadget? The one in the gray case, with the meter(?), some gray knobs, and 2 toggle switches on the front, and a black box on top of it? There's a printer behind it. Looks like you've got good taste in CAD tablets, too. -- Mike Andrews, W5EGO mikea@mikea.ath.cx Tired old sysadmin Article: 95454 of rec.radio.amateur.homebrew From: John Hudak Subject: Re: What Does Your Electronics Workshop Look Like? Date: Wed, 14 Dec 2005 11:44:23 -0500 Message-ID: References: <1134520239.071671.96720@g44g2000cwa.googlegroups.com> While I haven't built my bench yet, I've been planning it a Looooong time. I've assembled this list from having lived in my dads shop for 15 years and worked at various research labs for 20.... 1. Desktop - I prefer a deep top, on the order of 40" or more. Reason being that when test equipment becomes attached to larger devices (i.e., TVs), space becomes a premium, and laying a schematic on a hot chassis is not a good idea ;). 2. I like the top shelf idea but would use it for test gear that doesn't need to be watched or interacted with a lot while in use. Scope and logic analyzer on the bottom, Frequency generators, PS, etc on the top. A verticle shelf of test gear along the side works good for me. 3. Lots of outlets/wire mold. Wiremold along the back with 1" x1" panduit wireway to keep the power cords routed. 4. Power cut off switches for parts of the bench. 5. power conditioning for all of the bench (CV transformer/harmonic neutralizer), Also GFI protected. 6. Work lights - magnifier, fluorescent and incandescent. Why incandescent? Floursecent are such great RF radiators and influence some of the gear I design/work on. 7. VTVM and DMM (I am old fashioned - Depending on what I am measuring, I like a meter that can withstand "hitting the wrong testpoint" 8. Test lead, jumper clips hanger - Use 1"x1" panduit with one side cut off for hanging test leads. 9. storage shelves. For components, I like 6-9" deep, for test gear, etc., I like 24" deep. 10. IC storage. I tend to keep lots of ICs around. I like to keep them in the plastic carrier strips, cut a hole in one end and hang them. 11. PC and inventory control. I know this sounds a bit overboard but...print out barcode and attach to every spare part before stored. Scan when used. Keeps an inventory in a DB of parts. You have no idea how many times it was my job in my dads store to look for a part that he 'knew' he had. Also, since I collect old computer 'stuff', It is nice to have an inventory list. 12. A separate section or separate bench for 'fabrication' that would contain drills, hammers, vise, etc. 13. One idea that I saw for a woodwork bench that I like is a number of verticle, slide out, pegboard pieces (about 2-3' high and 2' deep that sit under the bench. The are verticle, perhaps tilted back slightly, and can slide out. Organize tools, whatever. Keeps them from being piled in drawers and saves time hunting them. 14. Get service data in electronic format. Get a scanner and PC. I grew up with and still have tons of service manuals and data books. Using PDF versions of all this stuff saves time and space. If I could only get my 15 yo data books on DVDs I'd be soooo happy... 15. Antistaic mat on benchtop and also floor pad (or paint, depending on situation) 16. I have often found the need for a hefty heat gun (in lieu of a reflow furnace, and also to remove components in mass...lol) 17. A 'L' shaped bench works better for me than a long one. Also, ppl sometimes put pegboard on the back of benches to hang stuff..I don't like that because I don't like reaching across my work. Personal preference. 18. If you do serious work, I recommend mainstream test gear (HP, Tek, Fluke, etc.). You can trust what you measure. I know cost is an issue, which is why I'd get good used gear. For example, I'd get a good used Tek 465B, 475 or 485 over the newer DSOs. Most of the time, I don't need color, I don't need it connected to my network, etc. (But I do have one just in case...) I've build this bench many times in my head and even started it in my basement, but never time to finish. Good luck John Too_Many_Tools wrote: > With the holiday season here it is time to redo the workshop and the > workbench in particular. > > So, what suggestions do you have for setting up a good efficient > workspace for electronics? > > Here's an example that I found.... > > http://www.stevenjohnson.com/workbench.htm > > So what does your workspace, test bench and layout look like? > > Pictures and links would be great. > > What has worked for you?...what hasn't? > > Benches, racks, cabinets, tables, carts.... > > Any particular test equipment that you would recommend for or against? > > Thanks > > TMT > Article: 95455 of rec.radio.amateur.homebrew From: Rich Grise Subject: Re: What Does Your Electronics Workshop Look Like? Message-ID: References: <1134520239.071671.96720@g44g2000cwa.googlegroups.com> <1134562449.096696.326280@o13g2000cwo.googlegroups.com> <43A01E55.4C1DD7C3@shaw.ca> Date: Wed, 14 Dec 2005 17:19:13 GMT On Wed, 14 Dec 2005 13:29:50 +0000, Irv Finkleman wrote: > "Saandy , 4Z5KS" wrote: >> >> YOU CALL THIS A WORKBENCH!?!?!? >> my Goodness, if the mess on mine is les than 5 inches deep I feel I >> didn't do anything on that table! You know, I trained myself to >> identify location of things by the sound they make when they fall on >> something else when I throw it aside. If I were now to mop it up , I >> wouldn't be able to find anything! >> In any case I wish you good luck and I congratulate you for the >> initiative. >> Saandy 4Z5KS > > Reminds me of one guy who complained that he could never find the chuck > key for his drill, so begin buying them by the dozen -- that way, he said, > they normally last for a week or two! :-) > You're supposed to ty-wrap it to the cord, out at the plug end, so that you can't use it while the drill is plugged in. (Keeps your hands in one piece.) :-) Cheers! Rich Article: 95456 of rec.radio.amateur.homebrew From: "Dale Parfitt" References: <1134520239.071671.96720@g44g2000cwa.googlegroups.com> Subject: Re: What Does Your Electronics Workshop Look Like? Message-ID: <%FZnf.16500$OK6.7497@trnddc03> Date: Wed, 14 Dec 2005 18:39:55 GMT "Mike Andrews" wrote in message news:dnphu8$9au$5@puck.litech.org... > In rec.radio.amateur.boatanchors Dale Parfitt > wrote: > >> Here's a couple pix of my shop. For test equipment- stick with the >> knowns- >> HP/Agielnt, Tektronix etc. >> http://www.w4dex.com/gallery/Dale-Parfitt/Dale_Parfitt_W4OP >> http://www.w4dex.com/gallery/Dale-Parfitt/Dale_Parfitt_W4OP_3 > > In W4OP_2, what's the rightmost gadget? The one in the gray case, > with the meter(?), some gray knobs, and 2 toggle switches on the > front, and a black box on top of it? There's a printer behind it. > > Looks like you've got good taste in CAD tablets, too. > > -- > Mike Andrews, W5EGO > mikea@mikea.ath.cx > Tired old sysadmin Hi Mike, That's a General Radio 1236 meter I use for measuring sun and moon noise on my 1296MHz moonbounce station. It is a 30MHz IF amp with decibel meter. In the extended mode, I can easily resolve 0.05dB changes. Sun noise measurements are an excellent standard by which we judge system efficiency. On 10GHz I can see about a dB of moon noise- which is also handy to keep the dish trained on the moon. That pix is pretty dated at this point- the 746 has been replaced by a 756PRO II and the SSB transverter has been replaced by a DEMI 1296-->28 MHz transverter. Dale W4OP Article: 95457 of rec.radio.amateur.homebrew From: "David G. Nagel" Subject: Re: What Does Your Electronics Workshop Look Like? References: <1134520239.071671.96720@g44g2000cwa.googlegroups.com> <439FAFDB.4ABD655A@earthlink.net> Message-ID: Date: Wed, 14 Dec 2005 23:14:40 GMT Michael A. Terrell wrote: > COLIN LAMB wrote: > >>The last time my bench was clean was over a decade ago - after I learned I >>had a very aggressive form of cancer. I reluctantly cleaned off the bench >>to save my wife from having to do it. >> >>But, through the miracles of drugs, the cancer went away. Now, my desks are >>all cluttered again. My wife fondly talks about how good life was when my >>desk was clean and I had sold much of my junk. I think she is kidding, but >>would not bet my life on it. >> >>When I clean an area, it is only temporary. >> >>At the constant prodding of my wife, I spend 3 months cleaning up the floor >>of my darkroom. I found things that had been missing for years. But, I >>could not clean up the desk, for it has all the little parts for which I do >>not have a place for. >> >>In the end, messiness is really just the product of someone who has so much >>order that he insists upon a place for each item before he puts it away. >> >>Colin K7FM > > > > A workbench is meant to be a living example of the moving hole > theory. ;-) > A clean work bench like a clear desk is a sign of a sick mind. ;^) Dave WD9BDZ Article: 95458 of rec.radio.amateur.homebrew From: Rich Grise Subject: Re: What Does Your Electronics Workshop Look Like? Message-ID: References: <1134520239.071671.96720@g44g2000cwa.googlegroups.com> <1134562449.096696.326280@o13g2000cwo.googlegroups.com> <43A01E55.4C1DD7C3@shaw.ca> <43A0AA0B.F1EB2614@earthlink.net> Date: Thu, 15 Dec 2005 01:52:06 GMT On Wed, 14 Dec 2005 23:26:10 +0000, Michael A. Terrell wrote: > Rich Grise wrote: >> >> You're supposed to ty-wrap it to the cord, out at the plug end, so that >> you can't use it while the drill is plugged in. (Keeps your hands in >> one piece.) :-) > > That doesn't work on my drill press. Its chained to the wiring cover > on the motor and only has a couple inches of slack to keep it out of the > way. Hmm, then maybe you need a little bungee for it. :-) Hey! I just had an invention! The chuck key plugs into a dead-man switch socket! It's right there on the drill press, and you pull it out, it kills the power, you use it, and you have to poke the chuck key back into its socket or the drill press won't turn on! ;-) Nah, they'd defeat it with a nail or something. Good Luck! Rich Article: 95459 of rec.radio.amateur.homebrew From: Ron in Radio Heaven Subject: Re: What Does Your Electronics Workshop Look Like? References: <1134520239.071671.96720@g44g2000cwa.googlegroups.com> <1134562449.096696.326280@o13g2000cwo.googlegroups.com> <43A01E55.4C1DD7C3@shaw.ca> <43A0AA0B.F1EB2614@earthlink.net> Message-ID: Date: Thu, 15 Dec 2005 02:56:16 GMT John Popelish wrote: > Rich Grise wrote: >> Hey! I just had an invention! The chuck key plugs into a dead-man switch >> socket! Not new, I installed one of those on the drill press where I used to work, more than 20 years ago. Guys kept leaving the key stuck in the chuck and then turning to motor on... Not good. Ron Article: 95460 of rec.radio.amateur.homebrew From: matt vk3zmw Subject: Re: To build or not to build References: <1134614180.793472.212750@g44g2000cwa.googlegroups.com> Message-ID: <8c8of.2805$V7.414@news-server.bigpond.net.au> Date: Thu, 15 Dec 2005 06:39:00 GMT yzordderrex@verizon.net wrote: > If everything works out this weekend I should have about 10w or so to > drive into a linear. My friend here in town thinks I should buy used > Dentron Clipperton or Heathkit. I don't think 10watts would do either > justice. If 10w would give me a KW out with a commercial unit I would > consider buying a good used unit. > > Plan bravo is to build. I would have to do tubes in keeping with the > theme of that side of the shack. CW, AM, & SSB are all modes that I > would operate. I only need to operate 160m - 40m. I am experienced > transistor engineer and my early schooling was in tubes , so not beyond > my reach for this type of a project. I have plenty of other homebrew > projects to keep me busy if this one gets scratched. > > I need help picking a topology and a tube set. Price and likelyhood of > getting the thing working are two top runners. From the 1965 ARRL > Handbook I see a few different tubes that might qualify. A Pair of 813 > in parallel, 3-400Z, 3-1000Z. I am soliciting some opinions on the > topology. Again, all I got is about 10w am going into. I would like > to do a kw or so pep. I am not looking to buy any parts at this time, > so not looking for any 'sales calls'. I need comments like - look at > this tube with this plate voltage kinda thing. Or try driving this toob > with a such and such to get a kw out. I would like to keep the design > required to a minimum and would consider some 'reverse engineering' a > plus at this point. If I can get most of the design out of an old ARRL > handbook then that would please me. > > 73 > Bob > N9NEO > 4CX1000. Parts *relativly* easy to obtain. Mechanically strong. Complete plans in ARRL handbook. KW+ all day on less than 10W drive. Wants a bit under 1Amp at 2.5 - 3kV If possible, get the 'K' model rather than the 'A'. Not so much for the frequency response as for the more robust screen. If your budget doesn't stretch to the genuine Eimac, try a copy such as Svetlana's 4CX1600. Article: 95461 of rec.radio.amateur.homebrew From: "Paul P" References: <1134574359.575250.129800@z14g2000cwz.googlegroups.com> Subject: Re: Help with Heath SB200 Message-ID: Date: Thu, 15 Dec 2005 13:59:48 GMT Lick your finder and draw an X of "saliva" on the face. Works great! PP "Tim Shoppa" wrote in message news:1134574359.575250.129800@z14g2000cwz.googlegroups.com... >> Also the meter seems to stick in a couple spots. > > Often, especially in the winter months, due to static electricity. > > See if wiping it with water or an anti-static cloth helps. > > Tim. > Article: 95462 of rec.radio.amateur.homebrew From: cas@w-sherwood.ih.lucent.com (Chuck Sherwood) Subject: Re: To build or not to build Date: 15 Dec 2005 15:38:56 GMT Message-ID: References: <1134614180.793472.212750@g44g2000cwa.googlegroups.com> Frankly I don't think 10W will drive any linear to 1kW. You will get the most gain from a Tetrode but I still don't think it will go 20db. I suggest you search for richard measures web page and read some of his articles about the merits of GG vs grid driven amplifiers. I think you will need an intermediate stage to get enough drive. Then you might as well pick up an old Heath SB200 or SB220 for the final stage. The SB200 will give you 500-600 watts out with a pair of 572s and you can buy them for 300 bucks. Plus the tubes are not too expensive if you need new ones. chuck Article: 95463 of rec.radio.amateur.homebrew From: "nobody" References: Subject: Re: Help with Heath SB200 Message-ID: Date: Thu, 15 Dec 2005 16:53:35 GMT Hi Chuck. I have a SB-200, but I don't have the time to take it apart and measure the size of the fan right now. Maybe this weekend. In the meantime, you might load and/or ask here: http://www.harbachelectronics.com/ He sells replace parts for SB-200, SB-220 and others. Ronnie, N5CSE "Chuck Sherwood" wrote in message news:dnpcaf$r9s@netnews.net.lucent.com... >I have a Heath SB200 that has been modified a bit too much. > Someone replaced the stock fan with a muffin fan and they > cut a big hole for the fan in the RF chamber. > > I want to replace the muffin fan with a fan resembling the > stock fan. Grainger sells motor and fan blades for appliances > that look close enough. I just need some data to choose the > right one. Most import is the fan blade size. Second would > be any specs for the motor. Stock motors range from 1/500Hp > to 1/20 HP. I suspect one of the smallers one based on physical > size. > > Also the meter seems to stick in a couple spots. I don't > see anything obvious like a bent needle. Any hope of finding > a similar meter that I can move the faceplate? Any place that > can repair meters? > > All help appreciated. > thanks > chuck Article: 95464 of rec.radio.amateur.homebrew From: Bill Turner Subject: Re: To build or not to build Date: Thu, 15 Dec 2005 11:20:51 -0800 Message-ID: References: <1134614180.793472.212750@g44g2000cwa.googlegroups.com> On Thu, 15 Dec 2005 04:42:33 +0000, Highland Ham wrote: >That's a 20dB amplification ...a bit much for a single stage amp. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ That's true in grounded grid mode, but quite doable for grid driven. According to the Amperex data sheet, a pair of 3-1000Zs in class B grid driven mode will give 3560 watts out for 28 watts of drive. For a single tube, that scales down to 127 watts out per watt in. 10 watts in will give 1270 watts out, a power gain of 21 dB. That's the only tube I've looked at so there may be others that will give a full 1500 out for 10 in. On the other hand, 1270 is close enough to 1500 that you'll probably never notice the difference. You will have to neutralize it of course, lest you end up with a high power VFO. :-) 73, Bill W6WRT Article: 95465 of rec.radio.amateur.homebrew From: "Joel Kolstad" Subject: Re: What Does Your Electronics Workshop Look Like? Date: Thu, 15 Dec 2005 11:48:11 -0800 Message-ID: <11q3i3qrhb08g2d@corp.supernews.com> References: <1134520239.071671.96720@g44g2000cwa.googlegroups.com> <1134562449.096696.326280@o13g2000cwo.googlegroups.com> <43A01E55.4C1DD7C3@shaw.ca> <43A0AA0B.F1EB2614@earthlink.net> "Rich Grise" wrote in message news:pan.2005.12.15.19.27.21.337730@example.net... > Then again, people pay for explosives inside their car in the name of > "safety"; why not add fifteen or twenty bucks to the cost of a power > tool if you can tout it as a "safety" feature? ;-P Because people are convinced that air bags are there to protect them when OTHERS crash into them, whereas few people are willing to pay for extra protective measures to protect them from THEMSELVES! :-) Article: 95466 of rec.radio.amateur.homebrew Message-ID: <43A1CCE3.FCBFCB30@earthlink.net> From: "Michael A. Terrell" Subject: Re: What Does Your Electronics Workshop Look Like? References: <1134520239.071671.96720@g44g2000cwa.googlegroups.com> <1134562449.096696.326280@o13g2000cwo.googlegroups.com> <43A01E55.4C1DD7C3@shaw.ca> <43A0AA0B.F1EB2614@earthlink.net> Date: Thu, 15 Dec 2005 20:07:07 GMT Rich Grise wrote: > > On Wed, 14 Dec 2005 23:26:10 +0000, Michael A. Terrell wrote: > > > Rich Grise wrote: > >> > >> You're supposed to ty-wrap it to the cord, out at the plug end, so that > >> you can't use it while the drill is plugged in. (Keeps your hands in > >> one piece.) :-) > > > > That doesn't work on my drill press. Its chained to the wiring cover > > on the motor and only has a couple inches of slack to keep it out of the > > way. > > Hmm, then maybe you need a little bungee for it. :-) I prefer the small chain. If someone turns the drill press on with it in the chuck there is a weak link that will snap and not whip the chain all over the place. > Hey! I just had an invention! The chuck key plugs into a dead-man switch > socket! It's right there on the drill press, and you pull it out, it kills > the power, you use it, and you have to poke the chuck key back into its > socket or the drill press won't turn on! ;-) > > Nah, they'd defeat it with a nail or something. > > Good Luck! > Rich I've got a scrap bench top drill press that was built with a switch lick that. Its the second one my dad has killed in the last seven years. You couldn't flip the power switch on the first one, till the chuck key was wedged into the hole. -- ? Michael A. Terrell Central Florida Article: 95467 of rec.radio.amateur.homebrew From: cas@w-sherwood.ih.lucent.com (Chuck Sherwood) Subject: Re: To build or not to build Date: 15 Dec 2005 20:41:56 GMT Message-ID: References: <1134614180.793472.212750@g44g2000cwa.googlegroups.com> <3ivV1UEZgcoDFADL@ifwtech.co.uk> In article <3ivV1UEZgcoDFADL@ifwtech.co.uk>, Ian White GM3SEK wrote: >73 from Ian GM3SEK 'In Practice' columnist for RadCom (RSGB) >http://www.ifwtech.co.uk/g3sek Damn you guys are good. I need to hang out here more often! chuck Article: 95468 of rec.radio.amateur.homebrew Date: Thu, 15 Dec 2005 21:50:08 +0100 From: Zak Subject: Re: What Does Your Electronics Workshop Look Like? References: <1134520239.071671.96720@g44g2000cwa.googlegroups.com> <1134562449.096696.326280@o13g2000cwo.googlegroups.com> <43A01E55.4C1DD7C3@shaw.ca> <43A0AA0B.F1EB2614@earthlink.net> Message-ID: <43a1d681$0$10823$6c4159fb@news.tweaknews.nl> Rich Grise wrote: > Not much industry experience, huh? ;-) I only mention it because almost > every major industrial-grade tool I've seen has "ON" and "OFF" buttons, > and a latching contactor. If power goes down, or the "OFF" button is > pressed, or the "EMERGENCY STOP" button is pressed, the machine turns > off, and doesn't restart when you reset the breaker - you have to > overtly press the green "ON" (or sometimes "START") button. This gives > you a chance to clear the scrap out of the machine before you reset > and restart whatever process got stopped in the middle. > > Probably cost-prohibitive for a consumer-level garage or basement > drill press. Well, the one I got at the supermarket for some 40 euros has one. They're actually simple devices: a switch where the latch is a tiny coil. Not expensive at all, if made in sufficient volume. Thomas Article: 95469 of rec.radio.amateur.homebrew From: Ignoramus8558 Subject: Re: What Does Your Electronics Workshop Look Like? References: <1134520239.071671.96720@g44g2000cwa.googlegroups.com> <1134562449.096696.326280@o13g2000cwo.googlegroups.com> <43A01E55.4C1DD7C3@shaw.ca> <43A0AA0B.F1EB2614@earthlink.net> Message-ID: Date: Thu, 15 Dec 2005 21:00:20 GMT On Thu, 15 Dec 2005 19:23:14 GMT, Rich Grise wrote: > > Probably cost-prohibitive for a consumer-level garage or basement > drill press. that stuff is pretty cheap these days. Nice ON/OFF buttons are about $13 at surpluscenter.com, and contactors cost next to nothing on ebay. i Article: 95470 of rec.radio.amateur.homebrew From: Al Subject: Re: What Does Your Electronics Workshop Look Like? References: <1134520239.071671.96720@g44g2000cwa.googlegroups.com> <1134562449.096696.326280@o13g2000cwo.googlegroups.com> <43A01E55.4C1DD7C3@shaw.ca> <43A0AA0B.F1EB2614@earthlink.net> <11q3i3qrhb08g2d@corp.supernews.com> Message-ID: Date: Thu, 15 Dec 2005 21:11:21 GMT In article <11q3i3qrhb08g2d@corp.supernews.com>, "Joel Kolstad" wrote: > "Rich Grise" wrote in message > news:pan.2005.12.15.19.27.21.337730@example.net... > > Then again, people pay for explosives inside their car in the name of > > "safety"; why not add fifteen or twenty bucks to the cost of a power > > tool if you can tout it as a "safety" feature? ;-P > > Because people are convinced that air bags are there to protect them when > OTHERS crash into them, whereas few people are willing to pay for extra > protective measures to protect them from THEMSELVES! :-) > > A little off topic, but air bags don't protect anything. People have air bags and now think they can drive more aggressively as they are "protected." Four-wheel drive also makes people drive in conditions they normally would not; but four-wheel stop is the same for both. Al Article: 95471 of rec.radio.amateur.homebrew From: "Heytubeguy" Subject: FA:JENNINGS FIXED GLASS CAPS 20KV Message-ID: Date: Thu, 15 Dec 2005 22:29:47 GMT Jennings fixed vac caps (glass) rated at 20kv, 100PF and 140PF + a few more items too; see at http://search.ebay.com/_W0QQfgtpZ1QQfrppZ25QQsassZheytubeguy tnx Merry Christmas, Happy New Year, Happy Hanukkak, 73 heytubeguy Article: 95472 of rec.radio.amateur.homebrew Message-ID: <43A220A9.1080406@bogus.net> Date: Thu, 15 Dec 2005 19:04:25 -0700 From: hayseed Subject: Re: "Standard parts" for rf amps? References: <438262c8$0$27904$9b4e6d93@newsread4.arcor-online.net> <11o4q89q7708kcd@corp.supernews.com> <11o5jngnvqrqmcb@corp.supernews.com> <4382ffe2$0$27884$9b4e6d93@newsread4.arcor-online.net> <4394cac3$0$9646$9b4e6d93@newsread2.arcor-online.net> <43957f44$0$9636$9b4e6d93@newsread2.arcor-online.net> <439943f3$0$27890$9b4e6d93@newsread4.arcor-online.net> Henry Kiefer wrote: > (Snippage) > Building a 32KHz oscillator with a clock crystal and having sinus output is > really simple with CMOS buffers. Like snot??? (more snippage) Sorry. I couldn't resist it. Merry Christmas to all!!! -Bob Article: 95473 of rec.radio.amateur.homebrew From: novatech@eskimo.com (Steven Swift) Subject: Re: MESA Quartz Crystals Date: 16 Dec 2005 03:39:44 GMT Message-ID: References: <43942f33$0$16208$4fafbaef@reader3.news.tin.it> "Steve Nosko" writes: >Do you know what load they are cut for? That osc is for overtone operation >and those usually run the crystal in series mode. If he doesn't care about absolute accuracy, series or parallel mode is not a concern. The LC tank will reduce phase noise, but shouldn't have a Q of more than about 10-20. If you tune the tank for max amplitude, you are sure to be at the right operating point for the xtal. Steve (part of AN419) -- Steven D. Swift, novatech@eskimo.com, http://www.novatech-instr.com NOVATECH INSTRUMENTS, INC. P.O. Box 55997 206.301.8986, fax 206.363.4367 Seattle, Washington 98155 USA From The Faerie Queen aka ZPK Sat Dec 17 22:55:06 EST 2005 Article: 95482 of rec.radio.amateur.homebrew From: Walter Raleigh Newsgroups: uk.radio.amateur,rec.radio.amateur.homebrew Subject: Re: Recommended reading for _REAL_ Radio Hams Organization: Raleigh Potato and Tobacco Farms Inc. Reply-To: The Faerie Queen aka ZPK Message-ID: References: <1126951418.730335.258350@g14g2000cwa.googlegroups.com> X-Newsreader: Forte Agent 3.1/32.783 X-No-Archive: yes MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Lines: 10 Date: Fri, 16 Dec 2005 20:12:15 +0000 NNTP-Posting-Host: 86.41.152.52 X-Complaints-To: abuse@eircom.net X-Trace: news.indigo.ie 1134763917 86.41.152.52 (Fri, 16 Dec 2005 20:11:57 GMT) NNTP-Posting-Date: Fri, 16 Dec 2005 20:11:57 GMT Path: news1.isis.unc.edu!canoe.uoregon.edu!hammer.uoregon.edu!news.wind.surfnet.nl!surfnet.nl!surfnet.nl!feeder.news.heanet.ie!news.indigo.ie!not-for-mail Xref: news1.isis.unc.edu uk.radio.amateur:257110 rec.radio.amateur.homebrew:95482 On Fri, 16 Dec 2005 20:09:28 +0000, Walt Davidson blurted forth into cyberspace: >Oh my ...... Sorry Walt, seems that other post wasn't irony after all. -- 73s de Walter R. Article: 95483 of rec.radio.amateur.homebrew From: "tox" References: <43a3294a.15803484@news.blueyonder.co.uk> Subject: Re: Tool Talk Message-ID: Date: Fri, 16 Dec 2005 21:29:01 GMT "Walter Raleigh" wrote in message news:a3c6q1l34l4c20n0fqdj2drcvvqsfcijfm@4ax.com... > > > Excellent! > > MattD, I think you'll like this :) Who's going to explain this to ZZZZZZZZZZZZzzzzzzzzzzzzzzzzzzzzzzzzzzzzzpk, Walter? Regards tox Article: 95484 of rec.radio.amateur.homebrew From: fmmck@aol.com (Fred McKenzie) Subject: Re: w.band new car Date: Fri, 16 Dec 2005 16:43:37 -0500 Message-ID: References: <1134522734.633635.175030@g14g2000cwa.googlegroups.com> In article <1134522734.633635.175030@g14g2000cwa.googlegroups.com>, "Gene" wrote: > New car yesterday, noticed today that it has weather > band....umnmn...any chance to re tune to the local railroad? 160.515... > or a local 2m repeater? Gene- Converting a modern frequency-synthesized radio to receive different frequencies may be possible, but quite a neat trick. A simpler approach would be to buy or build an external tuner. It could be crystal-controlled, switching between crystals for different frequencies. It could use only one crystal and use the existing radio's tuner to select different frequencies. 73, Fred, K4DII Article: 95485 of rec.radio.amateur.homebrew From: "DieSea" References: <43a3294a.15803484@news.blueyonder.co.uk> Subject: Re: Tool Talk Date: Fri, 16 Dec 2005 21:47:18 -0000 Message-ID: <43a335de$0$29561$da0feed9@news.zen.co.uk> >>Peter, G3PHO > > > Excellent! > > MattD, I think you'll like this :) > -- > > 73s de Walter R. Sprang to my mind as well More suitable for the Mech. in HIS kitchen I would have thought Wonder what he does his chips in Sump Oil Perhaps !! ? DieSea Article: 95486 of rec.radio.amateur.homebrew From: Korbin Dallas Subject: Re: What Does Your Electronics Workshop Look Like? Message-ID: References: <1134520239.071671.96720@g44g2000cwa.googlegroups.com> <1134562449.096696.326280@o13g2000cwo.googlegroups.com> <43A01E55.4C1DD7C3@shaw.ca> Date: Fri, 16 Dec 2005 21:51:05 GMT On Wed, 14 Dec 2005 17:19:13 +0000, Rich Grise wrote: > On Wed, 14 Dec 2005 13:29:50 +0000, Irv Finkleman wrote: > >> "Saandy , 4Z5KS" wrote: >>> >>> YOU CALL THIS A WORKBENCH!?!?!? >>> my Goodness, if the mess on mine is les than 5 inches deep I feel I >>> didn't do anything on that table! You know, I trained myself to >>> identify location of things by the sound they make when they fall on >>> something else when I throw it aside. If I were now to mop it up , I >>> wouldn't be able to find anything! >>> In any case I wish you good luck and I congratulate you for the >>> initiative. >>> Saandy 4Z5KS >> >> Reminds me of one guy who complained that he could never find the chuck >> key for his drill, so begin buying them by the dozen -- that way, he said, >> they normally last for a week or two! :-) >> > > You're supposed to ty-wrap it to the cord, out at the plug end, so that > you can't use it while the drill is plugged in. (Keeps your hands in > one piece.) :-) > > Cheers! > Rich A Clean Workbench is the sign of a person who is not doing anything... -- Korbin Dallas The name was changed to protect the guilty. Article: 95487 of rec.radio.amateur.homebrew From: "Ken Ward" References: <43a3294a.15803484@news.blueyonder.co.uk> Subject: Re: Tool Talk Message-ID: Date: Fri, 16 Dec 2005 22:01:16 GMT "Walter Raleigh" wrote in message news:a3c6q1l34l4c20n0fqdj2drcvvqsfcijfm@4ax.com... > On Fri, 16 Dec 2005 20:58:53 GMT, microwaves@blueyonder.co.uk (Peter) > blurted forth into cyberspace: > >>Just got this from my pal in Texas... >>It hits the nail on the head :-) >> >>Peter, G3PHO > > > Excellent! > > MattD, I think you'll like this :) I certainly did! KW Article: 95488 of rec.radio.amateur.homebrew From: class-a-pkearn-zuuzpk@multi-band-cb-is-here---its-as-easy-as-they-say.br.eircom.ie.net (zYYPK) Subject: Re: Tool Talk Date: Fri, 16 Dec 2005 22:53:18 GMT Message-ID: <43a343c4.1039495@news.iol.ie> References: <43a3294a.15803484@news.blueyonder.co.uk> "tox" wrote: > Regards > tox for your info dear tox. apart from _TWO_ , i have used all of those somewhere. including the dammit tool when i was trying to line up the chassis-end of the upper engine mount on an old mini-850 and the other tool broke (known in certain dublin circles as a PODGER or POJJER ) allowing my knuckles to go at 'lightning speed' straight into the shelf&bodywork behind it. now if you want to take a shot at me,,, then please TRY do it with some sort of STYLE rather than doing a very good impression of that well known cb'er MEGHERTZ. Article: 95489 of rec.radio.amateur.homebrew From: Micky Taker Subject: Re: Pepper And Salt - Re Gareth Alun Evans G4ASW References: <1134752578.139108.150450@g49g2000cwa.googlegroups.com> Message-ID: Date: Fri, 16 Dec 2005 23:32:30 GMT Pierian Spring wrote: > A number of potential recruits are in great danger of being > misled into thinking that they are Radio Hams when, in fact, > they are nothing of the kind! As it is the season of goodwill, > let us show our goodwill by saving these poor deluded fools > from the mischievous ne-er-do-wells who will attempt to > mislead them. (Radio Hams are technically-motivated people > and not merely turnip-brained button pushers like CBers and > like M3/CBers) > > What is Ham Radio? _On Aug 9 1996, at 7:00 am_ Gareth Alun Evans - G4ASW Published this message to the Public Domain G.A.Evans, Director, Out And About Systems Ltd Software Consultancy for Telecommunications, Real Time and ATE 13 Hardens Close, Chippenham, Wiltshire, SN15 3AA (01249) 651897 Yes morse is obsolete, but also useful. The former is no basis for banning it. The latter is no basis for using it as a passport to the HF Bands. Why do we need a further exam for incentive licensing? Do we not have enough already?.... (1) CB licence as an appetite whetter (2) Novice licence (3) RAE. (Perversely, the Novice RAE is a higher technical challenge than the RAE!) Restore the RAE to its technical status, and we have a sufficient and complete incentive licensing scheme, without anything to do with the Morse (Sorry, Vail) Code. Arguments relating to international requirements are redundant - laws change. Amateur Radio is dying, and this is due IMHO in no small part to the consumerism CBish activities of today, QSLing as an end in itself, WAB, contest operating other than as a means of evaluating one's technical equipment, squeakies on repeaters, walts on URA, and inane discussions about the turnips growing in one's garden. 72's de Gareth G4SDW GQRP 3339 ________________ Regards Micky Article: 95490 of rec.radio.amateur.homebrew Date: Fri, 16 Dec 2005 20:26:58 -0400 From: Bill Subject: Question regarding the AADE L/C meter Message-ID: <27c36$43a35b55$4232bd07$32385@COQUI.NET> Scratching my head again... This is specific to the AADE unit. I've got a coil of about 5mH. If I use the C function of the AADE I get a reading in the range of 25 pf. Am I seeing the actual interwinding capacitance here or is the combination with inductance goofing on the measurement circuit that this device utilizes? If it helps anyone get a "feel" for the amount of capacitance of this coil its about 175 turns, #37-ish loosely scatterwound in about 1.5" diameter, 1/8" wide and high. TIA, Bill WX4A/KP4 Article: 95491 of rec.radio.amateur.homebrew From: "xpyttl" References: <1134522734.633635.175030@g14g2000cwa.googlegroups.com> Subject: Re: w.band new car Message-ID: Date: Fri, 16 Dec 2005 20:39:37 -0500 "Fred McKenzie" wrote in message news:fmmck-1612051643370001@aca44713.ipt.aol.com... > Converting a modern frequency-synthesized radio to receive different > frequencies may be possible, but quite a neat trick. Actually, in theory it is pretty easy, in practice, darned near impossible. Given that the railroad and 2 meters are neither very far from the weather band, you probably could get reasonable performance without any front end changes. But here is the problem ... in the old days that tuning knob was attached to a variable capacitor and a slight change in the L and C values could move the radio. Today, however, that knob is attached to an encoder that is read by a microprocessor. The micro then tells a synthesizer what frequency to make. So, it is a simple matter of reprogramming the micro. There's the rub. Even if you had the capability to reprogram the micro (really not all that unreasonable) you would need to get the source code (not bloody likely). And if you had the code, simply understanding it would be a major challenge; I was visiting one auto manufacturer a few months ago and was surprised to learn they have over a million lines of code in the radio! > A simpler approach would be to buy or build an external tuner. It could > be crystal-controlled, switching between crystals for different > frequencies. It could use only one crystal and use the existing radio's > tuner to select different frequencies. This, actually, could be pretty simple. You are only a couple MHz away from the railroad frequency, so some sort of front end filter, a 602 with an appropriate crystal, and a whopping attenuator on the output of the 602 and you should be good to go. You could do something similar for a repeater, the rock would be more like 20 MHz instead of 2, but you couldn't cover much of the 2 meter band with the tuning from the weather band. But for one repeater... The ugliest part would be switching it in and out if you wanted to listen to the FM Broadcast band. .. Article: 95492 of rec.radio.amateur.homebrew Date: Fri, 16 Dec 2005 23:10:53 -0400 From: Bill Subject: Re: Question regarding the AADE L/C meter References: <27c36$43a35b55$4232bd07$32385@COQUI.NET> <1134785206.166528.296300@g49g2000cwa.googlegroups.com> Message-ID: <3b7d7$43a381bf$4232bd07$27029@COQUI.NET> K7ITM wrote: > You might pose > the question to AADE. > > Cheers, > Tom > I certainly will do so later. Their December vacation schedule conflicts with mine :) Tnx -Bill Article: 95493 of rec.radio.amateur.homebrew Date: Fri, 16 Dec 2005 23:25:09 -0400 From: Bill Subject: Re: w.band new car References: <1134522734.633635.175030@g14g2000cwa.googlegroups.com> Message-ID: xpyttl wrote: > "Fred McKenzie" wrote in message > news:fmmck-1612051643370001@aca44713.ipt.aol.com... > > >>Converting a modern frequency-synthesized radio to receive different >>frequencies may be possible, but quite a neat trick. > > > Actually, in theory it is pretty easy, in practice, darned near impossible. > Given that the railroad and 2 meters are neither very far from the weather > band, you probably could get reasonable performance without any front end > changes. I had a Nissan/Clarion radio that was stock for models exported to the "English Caribbean". It was set for 9 kc AM-BC channels and had no switch as an option. No importa that the Caribbean doesn't use 9kc channel spacing. The switch placement markings were on the multi-use PCB but it wasn't there. I'm sure there was a workaround but without supporting documentation it wasn't to be done...at least not by me. In the case of the Weather Band....since there is more than one freq in use, do you have any channel option there (WX1 or WX2) or is it just so broad that it will receive any Wx-band channels? I also suspect that this LO freq is programmed into the chip. They don't really make them "hobbyist-friendly" do they? -Bill in the old days that tuning knob was attached to > a variable capacitor and a slight change in the L and C values could move > the radio. Today, however, that knob is attached to an encoder that is read > by a microprocessor. The micro then tells a synthesizer what frequency to > make. So, it is a simple matter of reprogramming the micro. > > There's the rub. Even if you had the capability to reprogram the micro > (really not all that unreasonable) you would need to get the source code > (not bloody likely). And if you had the code, simply understanding it would > be a major challenge; I was visiting one auto manufacturer a few months ago > and was surprised to learn they have over a million lines of code in the > radio! > > >>A simpler approach would be to buy or build an external tuner. It could >>be crystal-controlled, switching between crystals for different >>frequencies. It could use only one crystal and use the existing radio's >>tuner to select different frequencies. > > > This, actually, could be pretty simple. You are only a couple MHz away from > the railroad frequency, so some sort of front end filter, a 602 with an > appropriate crystal, and a whopping attenuator on the output of the 602 and > you should be good to go. You could do something similar for a repeater, > the rock would be more like 20 MHz instead of 2, but you couldn't cover much > of the 2 meter band with the tuning from the weather band. But for one > repeater... > > The ugliest part would be switching it in and out if you wanted to listen to > the FM Broadcast band. > > .. > > Article: 95494 of rec.radio.amateur.homebrew From: Ken Scharf Subject: damaged collins filter? Message-ID: <27Mof.1557$aS5.297@bignews4.bellsouth.net> Date: Fri, 16 Dec 2005 23:06:46 -0500 I have a new in the original box F455N20 collins filter (from R390A) that I got at a hamfest many years ago and stored it away for a 'future project'. I dug it out recently and was examining it when I noticed that as I rotated it in my hand I could feel something inside shifting back and forth. I never noticed this before (the filter was NEVER dropped in my care and has remained packed in the original packing material all this time). Is this normal for this type of filter or might the unit be defective? Article: 95495 of rec.radio.amateur.homebrew From: Ken Scharf Subject: Re: To build or not to build References: <1134614180.793472.212750@g44g2000cwa.googlegroups.com> Message-ID: Date: Fri, 16 Dec 2005 23:15:24 -0500 yzordderrex@verizon.net wrote: > If everything works out this weekend I should have about 10w or so to > drive into a linear. My friend here in town thinks I should buy used > Dentron Clipperton or Heathkit. I don't think 10watts would do either > justice. If 10w would give me a KW out with a commercial unit I would > consider buying a good used unit. > > Plan bravo is to build. I would have to do tubes in keeping with the > theme of that side of the shack. CW, AM, & SSB are all modes that I > would operate. I only need to operate 160m - 40m. I am experienced > transistor engineer and my early schooling was in tubes , so not beyond > my reach for this type of a project. I have plenty of other homebrew > projects to keep me busy if this one gets scratched. > > I need help picking a topology and a tube set. Price and likelyhood of > getting the thing working are two top runners. From the 1965 ARRL > Handbook I see a few different tubes that might qualify. A Pair of 813 > in parallel, 3-400Z, 3-1000Z. I am soliciting some opinions on the > topology. Again, all I got is about 10w am going into. I would like > to do a kw or so pep. I am not looking to buy any parts at this time, > so not looking for any 'sales calls'. I need comments like - look at > this tube with this plate voltage kinda thing. Or try driving this toob > with a such and such to get a kw out. I would like to keep the design > required to a minimum and would consider some 'reverse engineering' a > plus at this point. If I can get most of the design out of an old ARRL > handbook then that would please me. > > 73 > Bob > N9NEO > As others have pointed out you will need a tetrode amp to get 20db of gain in one stage. The old warhorse 4cx1000a will do it, but this is an expensive tube with an expensive socket to match! Look for a Svetlana 4cx800 tube. The sockets for this are not too costly and the tube itself is in the $100-$150 range. A single 4cx800 will get you close to the legal limit. You can drive this tube as a conventional grid driven with tuned input, or use an impedance matching transformer with a 450 ohm swamping resistor. Yet another way is to run the tube cathode driven, but with normal grid bias and screen voltage, both grids bypassed to ground for rf. I'm not sure how much drive will be required in the cathode driven mode, but if operated in AB1 it will be much less than a conventional grounded grid circuit. Article: 95496 of rec.radio.amateur.homebrew From: "§|ª®T?ߪRt?@$t" <§|ª®T?ߪRt?@$t@norway_coastline.net> Subject: Re: Tool Talk Date: Sat, 17 Dec 2005 15:14:00 +0700 Message-ID: References: <43a3294a.15803484@news.blueyonder.co.uk> I see you cross posted this to 3 groups, none of which are relevant, I suggest you read the terms & conditions from Blueyonder about off-topic posting, it can result in termination of your service if enough people complain. BTW the address, for anyone interested, is abuse@blueyonder.co.uk Article: 95497 of rec.radio.amateur.homebrew From: "Ken Ward" References: <43a3294a.15803484@news.blueyonder.co.uk> Subject: Re: Tool Talk Message-ID: <9sQof.15897$b4.4435@newsfe1-win.ntli.net> Date: Sat, 17 Dec 2005 08:59:49 GMT "§|ª®T?ߪRt?@$t" <§|ª®T?ߪRt?@$t@norway_coastline.net> wrote in message news:do0hcf$v68$1@domitilla.aioe.org... >I see you cross posted this to 3 groups, none of which are relevant, I > suggest you read the terms & conditions from Blueyonder about off-topic > posting, it can result in termination of your service if enough people > complain. > > BTW the address, for anyone interested, is abuse@blueyonder.co.uk What a complete and utter miserable whinging bastard you alledgedly are! KW Article: 95498 of rec.radio.amateur.homebrew From: Micky Taker Subject: Re: Pepper And Salt - Re Gareth Alun Evans G4ASW References: <1134752578.139108.150450@g49g2000cwa.googlegroups.com> Message-ID: Date: Sat, 17 Dec 2005 09:53:46 GMT Walt Davidson wrote: > On Fri, 16 Dec 2005 23:32:30 GMT, Micky Taker > wrote: > >>Published this message to the Public Domain > G4ASW My humble apologies to G4ASW. Don't know where that came from, but I'm going to play the dyslexia card here. Either that or I was pi**ed. Regards, Micky Article: 95499 of rec.radio.amateur.homebrew From: Eric 2E0ECW Subject: Re: Pepper And Salt - Re Eric Williams M3EJO References: <1134752578.139108.150450@g49g2000cwa.googlegroups.com> <1134794232.231717.65710@g47g2000cwa.googlegroups.com> Message-ID: Date: Sat, 17 Dec 2005 10:46:02 GMT Pierian Spring wrote: > Going for an M3/CB Fools' Licence and then posting personal attacks in > the way that Eric did is a sure sign of lack of such dedication. Please quote said personal attack. > Eric - you are a stupid boy and should grow up. It may well > be that you wear long trousers but it is certain that your > mind is still in nappies. > One up to you then, looks like! Regards Eric 2E0ECW "Perversely, the Novice RAE is a higher technical challenge than the RAE!" - (C) Gareth Alun Evans 1996 Article: 95500 of rec.radio.amateur.homebrew From: class-a-pkearn-zuuzpk@multi-band-cb-is-here---its-as-easy-as-they-say.br.eircom.ie.net (zYYPK) Subject: Re: Pepper And Salt - Re Gareth Alun Evans G4ASW Date: Sat, 17 Dec 2005 12:12:13 GMT Message-ID: <43a4007e.569807@news.iol.ie> References: <1134752578.139108.150450@g49g2000cwa.googlegroups.com> Micky Taker wrote: > Gareth ____ _____ - G4ASW i'm sure g4asw will have something to say ! Article: 95501 of rec.radio.amateur.homebrew From: class-a-pkearn-zuuzpk@multi-band-cb-is-here---its-as-easy-as-they-say.br.eircom.ie.net (zYYPK) Subject: Re: Pepper And Salt - Re Gareth Alun Evans G4ASW Date: Sat, 17 Dec 2005 12:13:28 GMT Message-ID: <43a400bc.631862@news.iol.ie> References: <1134752578.139108.150450@g49g2000cwa.googlegroups.com> Micky Taker wrote: > My humble apologies to G4ASW. Don't know where that came from, but I'm > going to play the dyslexia card here. Either that or I was pi**ed. doh! mickey taker takes a nose dive. which is hard to do when flying so low in the first place ! Article: 95502 of rec.radio.amateur.homebrew From: Micky Taker Subject: Re: Pepper And Salt - Re Gareth Alun Evans G4ASW References: <1134752578.139108.150450@g49g2000cwa.googlegroups.com> <43a4007e.569807@news.iol.ie> Message-ID: <4QUof.10459$iz3.8136@text.news.blueyonder.co.uk> Date: Sat, 17 Dec 2005 13:58:24 GMT zYYPK, AKA - PAUL KEARNEY EI7GM, wrote: > Micky Taker wrote: > > >>Gareth ____ _____ - G4ASW > > > i'm sure g4asw will have something to say ! > Yes, I posted that through beer-tinted spectacles and realised the mistake in the cold light of day. Cheers, Micky Article: 95503 of rec.radio.amateur.homebrew From: "tox" References: <1134752578.139108.150450@g49g2000cwa.googlegroups.com> <43a4007e.569807@news.iol.ie> <4QUof.10459$iz3.8136@text.news.blueyonder.co.uk> Subject: Re: Pepper And Salt - Re Gareth Alun Evans G4ASW Message-ID: Date: Sat, 17 Dec 2005 14:51:19 GMT "Micky Taker" wrote in message news:4QUof.10459$iz3.8136@text.news.blueyonder.co.uk... >> > > Yes, I posted that through beer-tinted spectacles and realised the mistake > in the cold light of day. > No worse than DSP, heat bands, polarised resistors, fettling, slope detection, big k and of course, lol...unclear emissions! tox Article: 95504 of rec.radio.amateur.homebrew From: "Epsilon" References: <1134752578.139108.150450@g49g2000cwa.googlegroups.com> <1134755202.370913.241940@z14g2000cwz.googlegroups.com> <1134761643.625666.203100@g44g2000cwa.googlegroups.com> Subject: Re: Pepper And Salt (Seasoned Greetings) to all our readers - the Xmas FAQ Message-ID: <36Wof.3412$Og1.1741@fe2.news.blueyonder.co.uk> Date: Sat, 17 Dec 2005 15:25:51 GMT Here we go again.......... Blah blah blah blah blah. "Pierian Spring" wrote in message news:1134761643.625666.203100@g44g2000cwa.googlegroups.com... > If you publish Childish Broadcasts (CB) such as you > do below, then you will be perceived as a CBer. > > Ham Radio is a technical pursuit for which it is > important to maintain standards. There is no > bigotry in seeking to maintain educational > standards. > > We do ourselves no favours if we associate > with the non-technical turnip-brains. > > Grow up, Mike Gathergood! > > mike@g4kfk.co.uk wrote: > > Pierian Spring wrote: > > > A number of potential recruits are in great danger of being > > > misled into thinking that they are Radio Hams when, in fact, > > > they are nothing of the kind! As it is the season of goodwill, > > > let us show our goodwill by saving these poor deluded fools > > > from the mischievous ne-er-do-wells who will attempt to > > > mislead them. (Radio Hams are technically-motivated people > > > and not merely turnip-brained button pushers like CBers and > > > like M3/CBers) > > > > > > > The Pierian Spring, from Greek mythology, was a source of inspiration. > > > > I see nothing inspiring in the bigoted drivel you just posted. > > > > 73 > > Mike > > G4KFK > Article: 95505 of rec.radio.amateur.homebrew From: "Epsilon" References: <1134752578.139108.150450@g49g2000cwa.googlegroups.com> <66f6f$43a311ae$d1cc7a0b$8179@snip.allthenewsgroups.com> <1134761828.028673.59640@g49g2000cwa.googlegroups.com> Subject: Re: Pepper And Salt (Seasoned Greetings) to all our readers - the Xmas FAQ Message-ID: <36Wof.3413$Og1.854@fe2.news.blueyonder.co.uk> Date: Sat, 17 Dec 2005 15:25:51 GMT Do you cut and paste your messages. Is that how lazy you are. "Pierian Spring" wrote in message news:1134761828.028673.59640@g49g2000cwa.googlegroups.com... > If you wish to be perceived as a Childish Broadcaster (CBer) > then continue to publish Childish Broadcasts (CB) as you > do below. > > Ham Radio is a technical pursuit with gentlemanly > traditions, traditions which seem to be lost on you. > > Rooooooodney wrote: > > You should check into the Liberty Net at 10:00 PM > > saturday night (3.955 (+/- 10 kc) A real collection > > of crakns, grumpy old men, kooks and weirdoes. > > You would fit right in like lime jell-o into a piehole.... > From The Faerie Queen aka ZPK Sat Dec 17 22:55:11 EST 2005 Article: 95506 of rec.radio.amateur.homebrew From: Walter Raleigh Newsgroups: rec.radio.amateur.homebrew,uk.radio.amateur Subject: Re: Tool Talk Organization: Raleigh Potato and Tobacco Farms Inc. Reply-To: The Faerie Queen aka ZPK Message-ID: References: <43a3294a.15803484@news.blueyonder.co.uk> <9sQof.15897$b4.4435@newsfe1-win.ntli.net> <1134810616.633328.172820@g44g2000cwa.googlegroups.com> X-Newsreader: Forte Agent 3.1/32.783 X-No-Archive: yes MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Lines: 12 Date: Sat, 17 Dec 2005 18:29:21 +0000 NNTP-Posting-Host: 86.41.152.52 X-Complaints-To: abuse@eircom.net X-Trace: news.indigo.ie 1134844139 86.41.152.52 (Sat, 17 Dec 2005 18:28:59 GMT) NNTP-Posting-Date: Sat, 17 Dec 2005 18:28:59 GMT Path: news1.isis.unc.edu!arclight.uoregon.edu!hammer.uoregon.edu!logbridge.uoregon.edu!feed3.jnfs.ja.net!feed4.jnfs.ja.net!jnfs.ja.net!feeder.news.heanet.ie!news.indigo.ie!not-for-mail Xref: news1.isis.unc.edu rec.radio.amateur.homebrew:95506 uk.radio.amateur:257220 On 17 Dec 2005 01:10:16 -0800, "Pierian Spring" blurted forth into cyberspace: >You should be aware that >1. Common abuse is not libel. >2. Use of the word, "allegedly", however spelt, does not >give you a defence in a libel case. Well, you should know, O libellous (?) one. -- 73s de Walter R. From The Faerie Queen aka ZPK Sat Dec 17 22:55:11 EST 2005 Article: 95507 of rec.radio.amateur.homebrew From: Walter Raleigh Newsgroups: rec.radio.amateur.homebrew,uk.radio.amateur Subject: Re: Tool Talk Organization: Raleigh Potato and Tobacco Farms Inc. Reply-To: The Faerie Queen aka ZPK Message-ID: References: <43a3294a.15803484@news.blueyonder.co.uk> X-Newsreader: Forte Agent 3.1/32.783 X-No-Archive: yes MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Lines: 11 Date: Sat, 17 Dec 2005 18:30:18 +0000 NNTP-Posting-Host: 86.41.152.52 X-Complaints-To: abuse@eircom.net X-Trace: news.indigo.ie 1134844196 86.41.152.52 (Sat, 17 Dec 2005 18:29:56 GMT) NNTP-Posting-Date: Sat, 17 Dec 2005 18:29:56 GMT Path: news1.isis.unc.edu!canoe.uoregon.edu!hammer.uoregon.edu!logbridge.uoregon.edu!feed3.jnfs.ja.net!feed4.jnfs.ja.net!jnfs.ja.net!feeder.news.heanet.ie!news.indigo.ie!not-for-mail Xref: news1.isis.unc.edu rec.radio.amateur.homebrew:95507 uk.radio.amateur:257221 On Fri, 16 Dec 2005 21:29:01 GMT, "tox" blurted forth into cyberspace: >Who's going to explain this to ZZZZZZZZZZZZzzzzzzzzzzzzzzzzzzzzzzzzzzzzzpk, >Walter? I gather that Z is something of an authority on tools ;-) -- 73s de Walter R. Article: 95508 of rec.radio.amateur.homebrew From: Ken Scharf Subject: Re: To build or not to build References: <1134614180.793472.212750@g44g2000cwa.googlegroups.com> Message-ID: Date: Sat, 17 Dec 2005 15:56:30 -0500 Ian White GM3SEK wrote: > Ken Scharf wrote: > >> A single 4cx800 will get you close to the legal limit. > > > That's being over-ambitious. The manufacturer's data (Svetlana) says > that a single 4CX800A "will conservatively produce 750 watts PEP SSB, > and 750 watts Key Down CW in any of the three modes: grid-driven, > grid-driven passive input, and cathode-driven." > http://www.g8wrb.org/data/Svetlana/pdf/4CX800A.pdf > > You can certainly screw more power from the tube, but intermodulation > levels will rise rapidly. When selecting a tube, a good rule of thumb is > to expect an RF output equal to the tube's anode dissipation. > > If the original aim was for something "in the region of" a kilowatt, it > would be well worth considering a single 4CX800 at slightly reduced output. > > > I didn't have the data sheet in front of me, but I just assumed that with a plate rating of 800w it would max out near 1200w out. The 3cx800 tube will put out this much and there are single tube amps using this bottle that will do that. Guess the 4cx800 is a bit short on the plate voltage or max cathode current rating to make it to 1200w. Well you could use a pair of 4cx800's to get to 1500w out if that is your goal. A pair of these are STILL cheaper than a single 4cx1000a or 8877 (especially with the cost of the sockets figured in). Article: 95509 of rec.radio.amateur.homebrew From: "Samuel Hunt" Subject: BF964S noise - alternatives?? Date: Sat, 17 Dec 2005 23:15:24 +0000 (UTC) Message-ID: I'm looking at getting a preamp that's based around a BF964S. These appear to have about 1dB noise figure at 200mhz. It's to be used on 2m. Does anyone know of a suitable alternative that I could swap it with that has less noise? Sam Article: 95510 of rec.radio.amateur.homebrew From: Casual Fool Subject: Re: damaged collins filter? Date: Sat, 17 Dec 2005 18:14:05 -0500 Message-ID: References: <27Mof.1557$aS5.297@bignews4.bellsouth.net> On Fri, 16 Dec 2005 23:06:46 -0500, Ken Scharf wrote: >I have a new in the original box F455N20 collins filter >(from R390A) that I got at a hamfest many years ago >and stored it away for a 'future project'. > >I dug it out recently and was examining it when I noticed >that as I rotated it in my hand I could feel something >inside shifting back and forth. I never noticed this >before (the filter was NEVER dropped in my care and >has remained packed in the original packing material >all this time). Is this normal for this type of filter >or might the unit be defective? Hi Ken, I had a similar problem with an F455 XXXX 05 mechanical filter for a 75S-3B/C receiver. When I would switch it in, the insertion loss was 20 dB plus. Since I figured I had nothing to lose, I carefully took the filter apart, and as I recall, there are three wires that are spot welded to a row of resonating discs, and my filter had some busted connections on one row of the resonating discs. I knew I could not fix the filter, per say, but since I bought the 75S3-B from the original owner, he could have very well dropped the filter, and then installed it... I propose this for your filter. Since I haven't taken apart a R390A filter, plug the thing in, and see if there is any insertion loss. It may be that in your filter, which I presume is in a round package, like a 75A-4, was affixed on either end, where the input and output transformer(s) connect to the resonating discs, may have been held in place with some foam or glue to keep the discs from moving. I have seen in some Japanese mechanical filters they use a foam substance that degrades over the years, however, I'm not sure on the R390A filter.. So, plug the darn thing in a good working receiver, and see if it works.. If its busted, then you've only wasted a few minutes.. If your in dire straits, and need a new filter, or a used NOS filter, there are plenty out there.. BTW, I haven't known or heard of anyone that has really fixed a Collins Mechanical Filter with busted resonating discs where the stadia wire has broken loose from the discs... Good Luck OM es Best 73.. Tony WB8MLA, near Cleveland, OH... Article: 95511 of rec.radio.amateur.homebrew From: Ken Scharf Subject: Re: damaged collins filter? References: <27Mof.1557$aS5.297@bignews4.bellsouth.net> Message-ID: <9B2pf.4536$Qa1.176@bignews1.bellsouth.net> Date: Sat, 17 Dec 2005 20:07:44 -0500 Casual Fool wrote: > On Fri, 16 Dec 2005 23:06:46 -0500, Ken Scharf > wrote: > > >>I have a new in the original box F455N20 collins filter >>(from R390A) that I got at a hamfest many years ago >>and stored it away for a 'future project'. >> >>I dug it out recently and was examining it when I noticed >>that as I rotated it in my hand I could feel something >>inside shifting back and forth. I never noticed this >>before (the filter was NEVER dropped in my care and >>has remained packed in the original packing material >>all this time). Is this normal for this type of filter >>or might the unit be defective? > > > > Hi Ken, I had a similar problem with an F455 XXXX 05 mechanical filter > for a 75S-3B/C receiver. When I would switch it in, the insertion loss > was 20 dB plus. Since I figured I had nothing to lose, I carefully > took the filter apart, and as I recall, there are three wires that are > spot welded to a row of resonating discs, and my filter had some > busted connections on one row of the resonating discs. I knew I could > not fix the filter, per say, but since I bought the 75S3-B from the > original owner, he could have very well dropped the filter, and then > installed it... I propose this for your filter. Since I haven't taken > apart a R390A filter, plug the thing in, and see if there is any > insertion loss. It may be that in your filter, which I presume is in a > round package, like a 75A-4, was affixed on either end, where the > input and output transformer(s) connect to the resonating discs, may > have been held in place with some foam or glue to keep the discs from > moving. I have seen in some Japanese mechanical filters they use a > foam substance that degrades over the years, however, I'm not sure on > the R390A filter.. So, plug the darn thing in a good working receiver, > and see if it works.. If its busted, then you've only wasted a few > minutes.. If your in dire straits, and need a new filter, or a used > NOS filter, there are plenty out there.. BTW, I haven't known or heard > of anyone that has really fixed a Collins Mechanical Filter with > busted resonating discs where the stadia wire has broken loose from > the discs... Good Luck OM es Best 73.. Tony WB8MLA, near Cleveland, > OH... Thanks for the info. This filter is from the R390a and is normally soldered into the circuit. It does not have terminals that can 'plug in', the filter is mounted under the chassis in a bulkhead that shields the input from the output. The unit I have came in the original Collins box and was sold as a spare. I have another Collins filter, I think the part number is FA455N27 that is the usual plug in package with three pins on each end, probably from an S line rig. This filter makes no internal sound when handled, so it is still in good shape. I was going to use one of them in a homebrew rig and the older R390 type has a 2.0khz bandwidth vs the 2.7khz bandwidth of the newer filter. If these filters can go bad just sitting in the original box in a low humidity environment, I wonder how many R390A's now have rotting filters? Article: 95512 of rec.radio.amateur.homebrew From: "Paul P" Subject: Need a UHF tube - link Message-ID: <48apf.167149$qk4.131983@bgtnsc05-news.ops.worldnet.att.net> Date: Sun, 18 Dec 2005 09:40:16 GMT http://www.burle.com/comtube.htm Dream and Enjoy Article: 95513 of rec.radio.amateur.homebrew From: "Paul P" References: <48apf.167149$qk4.131983@bgtnsc05-news.ops.worldnet.att.net> Subject: AM xmtr Message-ID: Date: Sun, 18 Dec 2005 10:07:09 GMT http://www.amwindow.org/tech/htm/pw.htm You will need a license for these. "Paul P" wrote in message news:48apf.167149$qk4.131983@bgtnsc05-news.ops.worldnet.att.net... > http://www.burle.com/comtube.htm > > Dream and Enjoy > Article: 95514 of rec.radio.amateur.homebrew From: class-a-pkearn-zuuzpk@multi-band-cb-is-here---its-as-easy-as-they-say.br.eircom.ie.net (zYYPK) Subject: Re: Pepper And Salt - Re Gareth Alun Evans G4ASW Date: Sun, 18 Dec 2005 11:30:32 GMT Message-ID: <43a54827.84463036@news.iol.ie> References: <1134752578.139108.150450@g49g2000cwa.googlegroups.com> <43a4007e.569807@news.iol.ie> <4QUof.10459$iz3.8136@text.news.blueyonder.co.uk> "tox" wrote: > No worse than DSP, heat bands, polarised resistors, fettling, slope > detection, big k and > of course, lol...unclear emissions! if i didnt know any better i'd swear you have bits of twine attached to your wrists and the othr ends of the twine lead to somewhere in kent. Article: 95515 of rec.radio.amateur.homebrew From: class-a-pkearn-zuuzpk@multi-band-cb-is-here---its-as-easy-as-they-say.br.eircom.ie.net (zYYPK) Subject: Re: Tool Talk Date: Sun, 18 Dec 2005 11:31:02 GMT Message-ID: <43a5486d.84532956@news.iol.ie> References: <43a3294a.15803484@news.blueyonder.co.uk> Walter Raleigh wrote: > I gather that Z is something of an authority on tools ;-) 1. please publish your name + callsign in a similar manner to the way you have published my name + callsign. I want this reply as a simple FIRST NAME SECOND NAME and then CALLSIGN. 2. please state quite clearly if your reference to "automatics" and "jackeen ethnic cleansing" was a threat or not. I want this reply as a simple but definite YES or NO. I will continue to request above until you fully satisfy my requests. You have yet to answer EITHER request to my satisfaction as all previous replies have been so vague and wooly to a point of being useless. Article: 95516 of rec.radio.amateur.homebrew From: Leigh Preece Subject: Re: Pepper And Salt (Seasoned Greetings) to all our readers - the References: <1134752578.139108.150450@g49g2000cwa.googlegroups.com> <1134824498.223987.230200@g49g2000cwa.googlegroups.com> <4gYof.33615$Cj5.25484@newsfe6-win.ntli.net> <1134846819.893201.322730@o13g2000cwo.googlegroups.com> <1134884822.788286.296710@z14g2000cwz.googlegroups.com> <1134914296.290359.215880@g14g2000cwa.googlegroups.com> <1134916632.333413.24000@g14g2000cwa.googlegroups.com> <1134917216.802214.114720@g49g2000cwa.googlegroups.com> Message-ID: Date: Sun, 18 Dec 2005 16:18:37 GMT Pierian Spring wrote: > I mean, in this report you seem to be the bee's knees,..... > > http://www.holdthefrontpage.co.uk/news/2003/12dec/031222med.shtml > > But now you're suggesting that you're persona non grata? > > What happened? > > Or is this merely your attempt at FUD/Disinformation, and you > were given an official warning the last time that you brought > Maryhill High School into disrepute? Old news. Article: 95517 of rec.radio.amateur.homebrew From: Leigh Preece Subject: Re: Pepper And Salt (Seasoned Greetings) to all our readers - the References: <1134752578.139108.150450@g49g2000cwa.googlegroups.com> <1134824498.223987.230200@g49g2000cwa.googlegroups.com> <4gYof.33615$Cj5.25484@newsfe6-win.ntli.net> <1134846819.893201.322730@o13g2000cwo.googlegroups.com> <1134884822.788286.296710@z14g2000cwz.googlegroups.com> <1134914296.290359.215880@g14g2000cwa.googlegroups.com> <1134916632.333413.24000@g14g2000cwa.googlegroups.com> Message-ID: Date: Sun, 18 Dec 2005 16:20:22 GMT Pierian Spring wrote: > I suggest that you learn something about computers - the > qsl web site was working well in the 5 minutes immediately before > I wrote my original post (the one that got lost). It's a not a site - but a page. > And, on checking now, it is still working; I wouldn't follow > if the roles were reversed, but you > may like to try the following.... > > http://www.qsl.net/m5gwh/about%20me.htm Ermm - that's a webpage from a defunct site - an orphan page with no parent - so literally just existing and not referenced. Article: 95518 of rec.radio.amateur.homebrew From: Bill Turner Subject: Re: Question regarding the AADE L/C meter Date: Sun, 18 Dec 2005 08:42:00 -0800 Message-ID: References: <27c36$43a35b55$4232bd07$32385@COQUI.NET> <1134893594.569491.60600@g49g2000cwa.googlegroups.com> I don't believe that is correct. What you are measuring is the net result of the interwinding capacitance PLUS the reactance of the coil, but it is only correct at the frequency of the test. Change the frequency and you will get a different answer. You are NOT measuring the interwinding capacitance alone. 73, Bill W6WRT ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ORIGINAL MESSAGE: On 18 Dec 2005 00:13:14 -0800, "Saandy , 4Z5KS" wrote: >Yes, what you actually measure is the interwinding capacitance pf the >coil. Article: 95519 of rec.radio.amateur.homebrew From: toor@iquest.net (John S. Dyson) Subject: Re: BF964S noise - alternatives?? Date: Sun, 18 Dec 2005 17:15:17 +0000 (UTC) Message-ID: References: In article <1134922656.246374.46970@o13g2000cwo.googlegroups.com>, "K7ITM" writes: > I'm curious, what sorts of things do amateurs do that really need > better than a 1dB noise figure on 2 meters? I can understand it on > higher frequencies, but I'd have thought that galactic noise, at least, > would be a limiting factor on 2 meters. > > Looking to be educated, > I also question (a little) the need for better than a true 1dB NF when using a terrestrial antenna in the 2M band. On the other hand, if the transistor is speced to be able to supply 1dB NF, but isn't working as well as desired because of preamp design, high return loss, etc. It isn't really HARD to get 1dB NF at frequencies below 1GHz (or even higher), but it is sometimes tricky to get a good real world NF while also providing good return losses (good impedance match), at high signal levels, especially while trying to minimize DC power usage. My own high-end jelly bean for near-ultimate performance below 1GHz, moderately high power for reception (10mw - 100mw), reasonable noise match in the 50-75Ohm range, but perhaps a little tricky due to high frequency behavior would be the HP f54143 (Hi IP3, reasonable noise match, it has lots/too much of UHF or higher freq gain, but is moderately well behaved). This part costs less than $2... (I bought my supply for between $1.50 and $2.00 each.) I'd also consider using moderate current SiGe transistors while biasing them at about 10ma to 20ma (which is generally a reasonable range for a good 50-75ohm noise match.) Either the SiGe transistors NESG2101 or the PHEMT (54143) will give better than 1dB NF with a generally fairly wide noise match. (SiGe is generally better than most alternatives for oscillators -- off subject -- also, due to their generally very good 1/f characteristics and generally high Beta, which translates to generally low current noise -- esp in the low freqs where part of the AM/PM noise comes from.) Given the very wide signal strength range, I'd definitely consider OIP3 of at least 25-30dBm, and try to design for no more than 10-15dB gain. It is very possible that even a very highly performing preamp will work worse than no preamp at all!!! John Article: 95520 of rec.radio.amateur.homebrew From: Spike Subject: Re: Hi Just Saying Hello Date: Sun, 18 Dec 2005 18:24:58 +0000 Message-ID: References: <1134928535.537050.129240@g49g2000cwa.googlegroups.com> Harry wrote: > >"Pierian Spring of very dull water" wrote: > >> Ham Radio is not a hobby, it is a technical pursuit. ITHM "it is technically a pursuit of the uneatable by the unspeakable". It has one proponent on ukra. An even cursory study of the gospel by which it is promulgated will reveal it is built on sand rather than rock; 'operating' was once decried, but is now elevated to the highest level. Or has it changed yet again? Who knows? Who cares? >Why the personal attack? You have entered the pastime by the easiest means possible. Some, who did the same in their time, cover their embarrassment by attacking those who came later and did the same thing. They are evident by their bluster, self-importance, and technical pomposity. Take no notice of them. from Aero Spike Article: 95521 of rec.radio.amateur.homebrew From: " Harry" Subject: Re: Hi Just Saying Hello Date: Sun, 18 Dec 2005 18:36:26 -0000 Message-ID: References: <1134928535.537050.129240@g49g2000cwa.googlegroups.com> "Spike" wrote in message news:th9bq1ts3sc3a5fomeg0924nq3hl0jgjlh@4ax.com... > > Harry wrote: > >> >>"Pierian Spring of very dull water" wrote: >> >>> Ham Radio is not a hobby, it is a technical pursuit. > > ITHM "it is technically a pursuit of the uneatable by the > unspeakable". > > It has one proponent on ukra. > > An even cursory study of the gospel by which it is promulgated will > reveal it is built on sand rather than rock; 'operating' was once > decried, but is now elevated to the highest level. Or has it changed > yet again? Who knows? Who cares? > >>Why the personal attack? > > You have entered the pastime by the easiest means possible. > > Some, who did the same in their time, cover their embarrassment by > attacking those who came later and did the same thing. They are > evident by their bluster, self-importance, and technical pomposity. > > Take no notice of them. Thank you Spike, it sounds like good advice. Harry Article: 95522 of rec.radio.amateur.homebrew From: Leigh Preece Subject: Re: Pepper And Salt (Seasoned Greetings) to all our readers - the References: <1134752578.139108.150450@g49g2000cwa.googlegroups.com> <1134824498.223987.230200@g49g2000cwa.googlegroups.com> <4gYof.33615$Cj5.25484@newsfe6-win.ntli.net> <1134846819.893201.322730@o13g2000cwo.googlegroups.com> <1134884822.788286.296710@z14g2000cwz.googlegroups.com> <1134914296.290359.215880@g14g2000cwa.googlegroups.com> <1134916632.333413.24000@g14g2000cwa.googlegroups.com> <1134926670.660726.238160@g43g2000cwa.googlegroups.com> Message-ID: Date: Sun, 18 Dec 2005 18:46:33 GMT Pierian Spring wrote: > No, you are quite wrong on two counts..... > 1. The qsl web site is definitely a site and not a page. I insist that it is simply a page - maybe you should learn the rudiments of website assembly as there is no identifiable index or homepage but a collection of orpan pages or what would have been 'parent/child' pages. > 2. "http://www.qsl.net/m5gwh/about%20me.htm" is not > an orphan at all, because if you try for "http://www.qsl.net/m5gwh", > you get access to a fairly extensive directory. Yes - correct - but again this is a directory listing and not a website as, I state above, a website requires a definate 'index' or 'home' page. > I suggest that you learn something about computers. I suggest you learn something about website construction and the heirarchy system of website structure. Article: 95523 of rec.radio.amateur.homebrew Date: Sun, 18 Dec 2005 15:41:11 -0400 From: Bill Subject: Re: Question regarding the AADE L/C meter References: <27c36$43a35b55$4232bd07$32385@COQUI.NET> <1134893594.569491.60600@g49g2000cwa.googlegroups.com> Message-ID: Bill Turner wrote: > I don't believe that is correct. > > What you are measuring is the net result of the interwinding > capacitance PLUS the reactance of the coil, but it is only correct at > the frequency of the test. Change the frequency and you will get a > different answer. You are NOT measuring the interwinding capacitance > alone. > > 73, Bill W6WRT I partially agree, Bill. After looking at the schematic and crunching some numbers I see that the added inductance at the 750 kc test freq would have the equivalent 'shift' of about 20pf in this particular example. So taking that into account there's no reason to believe that the remainder of the reading is not the actual capacitance inherent in the coil. -Bill Article: 95524 of rec.radio.amateur.homebrew Date: Sun, 18 Dec 2005 21:33:52 +0100 From: Rolf_B Subject: Re: Unusual functions of cheap parts References: <4385b3b1$1$27887$9b4e6d93@newsread4.arcor-online.net> Message-ID: <43a5c7b1$1_1@news.bluewin.ch> John Larkin wrote: > > A 1N4007 can also be used as a drift step-recovery diode and as a > plasma avalanche diode. Together, two can generate a kilovolt edge > with a 100 ps risetime. Very interesting. The 1N4007 seem to be very versatile devices. They are available with a SOD-57 glass envelope, too (1N4007G?). These are fairly well photoconductive. When illuminated by a high efficiency IR LED (HSDL-4230 or so) current transfer ratios of 0.001 can be achieved. Not too much, but with two LEDs 100uA of photocurrent is obtainable. This is OK for a pass element in an "electrostatic" power supply for e.g. electron or ion lens systems. -- mfg Rolf Bombach Article: 95525 of rec.radio.amateur.homebrew From: Paul Keinanen Subject: Re: BF964S noise - alternatives?? Message-ID: References: <1134922656.246374.46970@o13g2000cwo.googlegroups.com> Date: Sun, 18 Dec 2005 22:38:06 +0200 On Sun, 18 Dec 2005 17:15:17 +0000 (UTC), toor@iquest.net (John S. Dyson) wrote: >I also question (a little) the need for better than a true 1dB NF >when using a terrestrial antenna in the 2M band. >Given the very wide signal strength range, I'd definitely consider OIP3 >of at least 25-30dBm, and try to design for no more than 10-15dB gain. >It is very possible that even a very highly performing preamp will work >worse than no preamp at all!!! One reason for attempting to get a low noise figure as possible, even for terrestrial working, is that you can then afford a larger loss due to input band-pass filtering. The unloaded Q to loaded Q ratio of the input filter determines the filter loss and the unloaded Q is mainly defined by the filter construction (LC, Helical, 1/4 lines etc.). A 15:1 ratio would give about 0.5 dB loss, while 5:1 ratio attenuates the passband by 1.5 dB. Assuming a unloaded Q of 100 for an LC filter and loaded Q of 20 would produce a 7 MHz bandwidth (at -3 dB points) with 1.5 dB loss in the middle of passband and assuming 0.5 dB preamplifier noise would give a total 2.0 dB noise figure, with a nice attenuation of broadcast FM and VHF TV signals that otherwise might overload the preamplifier. Paul OH3LWR Article: 95526 of rec.radio.amateur.homebrew From: John Larkin Subject: Re: Unusual functions of cheap parts Date: Sun, 18 Dec 2005 13:04:19 -0800 Message-ID: <1bjbq19ncb6bmkrb4v9n85687s3ro2btcc@4ax.com> References: <4385b3b1$1$27887$9b4e6d93@newsread4.arcor-online.net> <43a5c7b1$1_1@news.bluewin.ch> On Sun, 18 Dec 2005 21:33:52 +0100, Rolf_B wrote: >John Larkin wrote: >> >> A 1N4007 can also be used as a drift step-recovery diode and as a >> plasma avalanche diode. Together, two can generate a kilovolt edge >> with a 100 ps risetime. > >Very interesting. The 1N4007 seem to be very versatile devices. >They are available with a SOD-57 glass envelope, too (1N4007G?). >These are fairly well photoconductive. When illuminated by >a high efficiency IR LED (HSDL-4230 or so) current transfer >ratios of 0.001 can be achieved. Not too much, but with >two LEDs 100uA of photocurrent is obtainable. This is OK for >a pass element in an "electrostatic" power supply for e.g. >electron or ion lens systems. A high-voltage optocoupler; cool. I've posted a schematic for a hv opamp (400 v p-p) that uses two optoisolators as the output push-pull stage... it's very cheap and simple. A higher-voltage photodetector, like a glass power diode, sounds useful, too. I worked once with a company in Southern California that had a neat gadget: it was a truncated cone of silicon with gold contacts on the base and the flattened apex. It would stand off something like 5KV until you whacked it from above with a laser, illuminating all the sides of the cone, whence it would conduct hard. I think they went out of business, though; it was pretty obscure. John Article: 95527 of rec.radio.amateur.homebrew Message-ID: <43A5D288.8030009@nospam.com> From: Fred Bloggs Subject: Re: What Does Your Electronics Workshop Look Like? References: <1134520239.071671.96720@g44g2000cwa.googlegroups.com> <1134782992.159432.296340@g44g2000cwa.googlegroups.com> Date: Sun, 18 Dec 2005 21:20:13 GMT > > How much and what type of storage do you have? I take what they give me- but I prefer those big roll around multi-drawer jobs with each drawer user partitioned. > > How are the workbenches laid out most efficiently? L shaped? U shaped? > T shaped? Makes no difference- all lined up against one wall works well, the mobile stuff needs to go in a rack anyway- roll the rack to where it's needed, some people prefer carts. > > How much stationary and how much mobile? Every thing goes mobile at one point or any other. Stationary just means it will be something to make mobile later. > > What do you like for lighting? It can only be flourescent- and built in to the bench in addition to normal room lighting works best. > > Has anyone built power busses into your bench? If so, what was it? A real bench has bussed line voltage with *LOTS* of receptacles. > > How about floor coverings? Ever drop a tiny screw or surface mount part > on the floor and spend hours looking for it? It always has to be thick insulating mats rated for 20KV, any IC dropped on the floor is considered lost and not used, a screw is a different matter, you shouldn't have to hunt for a hard to find screw, you should be able to cut to length any replacement. Better make space for lots of data books and a computer, fire extinguisher, metal working machines, first aid kit, smoke alarm, set-aside projects, file cabinets, and nice-to-get-to-later junk you will accumulate. And make it so that every damned thing can be locked up- especially the door to the lab, and more locks on all the storage cabintes once inside, you may consider touch pad enable of all the room receptacles, and installing an alarm. Article: 95528 of rec.radio.amateur.homebrew From: Jim Thompson Subject: Re: What Does Your Electronics Workshop Look Like? Message-ID: References: <1134520239.071671.96720@g44g2000cwa.googlegroups.com> <1134782992.159432.296340@g44g2000cwa.googlegroups.com> <43A5D288.8030009@nospam.com> Date: Sun, 18 Dec 2005 14:26:33 -0700 On Sun, 18 Dec 2005 21:20:13 GMT, Fred Bloggs wrote: [snip] >you may consider touch pad enable of all the room >receptacles, and installing an alarm. When I was involved in off-line switchers I had a "panic button" installed... one side-of-the-hand punch dropped the whole lab. Plus a rule of no work unless a minimum of two people were there. ...Jim Thompson -- | James E.Thompson, P.E. | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona Voice:(480)460-2350 | | | E-mail Address at Website Fax:(480)460-2142 | Brass Rat | | http://www.analog-innovations.com | 1962 | I love to cook with wine. Sometimes I even put it in the food.