Article: 94192 of rec.radio.amateur.homebrew From: "clf" References: <1124850656.892394.139930@f14g2000cwb.googlegroups.com> Subject: Re: Stable Regen Receiver--Does it Exist?? Message-ID: <_u%Oe.30889$Tf5.16944@newsread1.mlpsca01.us.to.verio.net> Date: Wed, 24 Aug 2005 10:30:02 -1200 "John Ferrell" wrote in message news:opsog1pvvd35he36nrtrio3ifbcsml44cb@4ax.com... > May be I should not post before the second cup of coffee in the > morning, but it seems to me that stable regeneration nets out to a > Q-Multiplier. Don't let me discourage your activities, you would not > be the first to find a new life for an old method. > > Personally, I find myself thinking about Parametric amplifiers a good > bit these days... > > On 23 Aug 2005 19:30:56 -0700, kizerian@xmission.com wrote: > >>I have built a few dozen regen receivers and they all seem to work well >>enough on AM signals--some extremely well--but kind of fall apart when >>it comes to STABLE reception of CW and SSB. >> >>Has anyone ever built a solid state regen that does well with CW and >>SSB? If so I would love to know how you did it (I'd even share my some >>of my massive collection of radio parts with you)...before I go off and >>build another dozen regens. >> >>I have a box full of prototypes affectionately dubbed my radio reject >>graveyard (or dead radio pile)...I just don't want to be up to my neck >>in more prototypes before I finally get a good one. >> >>Seriously thinking of skipping it and building a simple DC or superhet. >> >>Bruce Kizerian kk7zz >>www.elmerdude.com > I have an older - but in reasonably decent condition - Radio Shack Regen receiver which does like 590 KC - 30 MHz - operates on 4 "C" batteries and has a jack for external power - bought it at an estate sale. I was able to scrounge up a manual for it too. I've used it a few times, but Regens are not my idea of a good time. Have thought of putting it out to the public for those who like em - but not sure yet if I'll do that. Maybe I'll give it another shot - let it try to earn it's keep. It is small enough, I thought about using it with a QRP transmitter and have a nice portable set up. Maybe I'll try to tune it up per the manual. I hadn't tried that yet - the radio became a back burner project since I bought it. Tuning "may" make a world of difference! Who knows when the thing was last checked or if it was even done right to start with. The thing is kinda neat looking, so would hate to get rid of it. But, if I"m not going to use it, no sense letting it collect dust. clf Article: 94193 of rec.radio.amateur.homebrew From: Win Subject: Re: Desktop metal shielded PC case? Date: Wed, 24 Aug 2005 10:23:44 -0500 Message-ID: <0s3pg1lmnlk3tqf8d6840lojpl3k1i1rg5@4ax.com> References: <1116180057.598783.160160@g14g2000cwa.googlegroups.com> <11gks2kmtouq3fc@corp.supernews.com> I worked for weeks to get the RFI out of my computer. It was coming >from within a commerical RFI protected case. I had S-9 plus readings on 40 and 80 meters. When I finally turned my attention to AC power cord and filtered it, levels dropped into the normal band noise. win w0lz Article: 94194 of rec.radio.amateur.homebrew Message-ID: <430CAAE7.4C653B22@earthlink.net> From: "Michael A. Terrell" Subject: Re: Desktop metal shielded PC case? References: <1116180057.598783.160160@g14g2000cwa.googlegroups.com> <11gks2kmtouq3fc@corp.supernews.com> <11gnsldr4to7hd0@corp.supernews.com> Date: Wed, 24 Aug 2005 17:14:19 GMT Ron Bean wrote: > > I'm not worried about anything specific, but I know the manufacturers go > to great lengths to pass an rfi test, and yet it seems they are solving > a non-problem. > > I do occasionally run PCs with the covers off, but I seldom have a radio > or TV on, so if I were causing any interference anywhere (eg in the > apartment nextdoor) I wouldn't notice it. I've heard urban legends about > early microcomputers causing interference, were they noisier or were old > TVs more sensitive to it? Early PCs had a lower frequency system clock so there were more harmonics to beat against other signals to cause interference. The original IBM PC had a 4.77 MHz system clock that caused all kinds of problems. There wasn't' a TV channel that didn't have at least one harmonic, and some had two. The interference dropped off as the frequency went up, but some early computers could wipe out the upper UHF TV channels. -- Link to my "Computers for disabled Veterans" project website deleted after threats were telephoned to my church. Michael A. Terrell Central Florida Article: 94195 of rec.radio.amateur.homebrew From: "Roger Conroy" Subject: Re: Material for Flexible Whip antenna Date: Wed, 24 Aug 2005 14:17:14 +0200 Message-ID: References: "David" wrote in message news:S3SOe.8590$FA3.4667@news-server.bigpond.net.au... >I am looking for the Black (Nylon,Polythene ???) tubing around 6mm OD > and wall thickness of 1mm for construction of 900 MHz whip antenna. > It needs to be fairly rigid as it is glued to an SMA plug. > > If anyone can advise what material is typically used and where I could > purchase > a reel of it (maybe it is even pressure tubing for pnuematics ?), it would > be much > appreciated. Australian source would be preferrable. > > Thank in advance > > Regards > > David Try a gardening shop. Drip/micro spray irrigation uses pvc tubing that might fit your requirement. Don't forget to do a microwave oven test on the material because some black plastics are carbon filled. 73 Roger ZR3RC Article: 94196 of rec.radio.amateur.homebrew From: "John A" Subject: Re: HP 8558B Analyser Problem - Help Needed Date: Wed, 24 Aug 2005 20:22:35 +0100 Message-ID: References: See http://homepage.eircom.net/~ei9gq/spec2.jpg for a screen shot. John Article: 94197 of rec.radio.amateur.homebrew From: "DPhil" Subject: Broadband Amplifier Date: Wed, 24 Aug 2005 21:49:39 +0100 Message-ID: <430cdcfe_3@mk-nntp-1.news.uk.worldonline.com> I am trying to build the amplifier in W1FB's QRP Notebook, p.135, Fig 4-18 Capacitors C8, C14 & C18 no value is specified, No other broadband amplifier in this book or EMRFD show a capacitor between collector and ground. Are these capacitors needed, if so what value and what purpose do they serve? TIA Phil G8AAE Article: 94198 of rec.radio.amateur.homebrew From: "Richard W. Solomon, W1KSZ" Subject: Re: Powerpole 180A Connectors Message-ID: <9hnpg15mc8el1keek6gfnbkvbu2in37bgs@4ax.com> References: <6mbng1199dj1p6ji91rf198rrnh99jrr00@4ax.com> Date: Wed, 24 Aug 2005 20:53:45 GMT No, they are the SINGLEPOLE Connectors. http://www.andersonpower.com/products/pp/sp.html 73, Dick, W1KSZ On Tue, 23 Aug 2005 20:59:23 -0500, "gb" wrote: >"Richard W. Solomon, W1KSZ" wrote in message >news:6mbng1199dj1p6ji91rf198rrnh99jrr00@4ax.com... >> The Glenayre Power Supply I got with it's companion Amp uses 180A >> Powerpole Connectors for the 28 vdc output. Anyone got a spare couple >> of these beasties ?? Even better would be the interconnecting power >> cable, there are two ~1/4" pins for the +DC and two ~1/4" jacks for >> the -DC. I found a GR double plug fits the -DC, but the +DC has me >> stumped. I hate to tack solder a lead on them (too tacky !!). >> >> 73, Dick, W1KSZ >> > >I assume you are referring to the Anderson "SB" series PowerPole connectors? >http://www.powerwerx.com/category.asp?CtgID=3579 > >w9gb > Article: 94199 of rec.radio.amateur.homebrew From: Tim Wescott Subject: Re: Broadband Amplifier Date: Wed, 24 Aug 2005 13:59:23 -0700 Message-ID: <11gpnsuppmqv4dd@corp.supernews.com> References: <430cdcfe_3@mk-nntp-1.news.uk.worldonline.com> DPhil wrote: > I am trying to build the amplifier in W1FB's QRP Notebook, p.135, Fig 4-18 > Capacitors C8, C14 & C18 no value is specified, No other broadband > amplifier in this book or EMRFD show a capacitor between collector and > ground. Are these capacitors needed, if so what value and what purpose > do they serve? > > TIA > > Phil G8AAE > > > > Schematic? My edition of "QRP Notebook" only goes to page 77. -- Tim Wescott Wescott Design Services http://www.wescottdesign.com Article: 94200 of rec.radio.amateur.homebrew From: "DPhil" Subject: Re Broadband Amplifier Date: Wed, 24 Aug 2005 22:22:29 +0100 Message-ID: <430ce4af_3@mk-nntp-1.news.uk.worldonline.com> Sorry should have said 2Edn. 1991. This goes to 174 pages. Thanks Phil G8AAE Article: 94201 of rec.radio.amateur.homebrew From: nospam@nouce.bellatlantic.net Subject: Re: Broadband Amplifier Message-ID: References: <430cdcfe_3@mk-nntp-1.news.uk.worldonline.com> Date: Wed, 24 Aug 2005 22:50:56 GMT On Wed, 24 Aug 2005 21:49:39 +0100, "DPhil" wrote: >I am trying to build the amplifier in W1FB's QRP Notebook, p.135, Fig 4-18 >Capacitors C8, C14 & C18 no value is specified, No other broadband >amplifier in this book or EMRFD show a capacitor between collector and >ground. Are these capacitors needed, if so what value and what purpose >do they serve? > >TIA > >Phil G8AAE Not meaning to be rude did you read the caption below the schematic? Extracted text for those that do not have the book: "..C8, C14 and C18 are shown only as optional units if it is desired to roll off the high frequency response for a special application." That should be enough explanation. Allison Article: 94202 of rec.radio.amateur.homebrew From: "Henry Kolesnik" References: <1124850656.892394.139930@f14g2000cwb.googlegroups.com> Subject: Re: Stable Regen Receiver--Does it Exist?? Message-ID: Date: Thu, 25 Aug 2005 01:33:01 GMT There's a good article in Jan/Feb 2004 QEX by WD5HOH for A Cascade Regenerative Receiver with two regen stages. The article covers what must be done to achieve stability with references to other regen articles. -- 73 Hank WD5JFR wrote in message news:1124850656.892394.139930@f14g2000cwb.googlegroups.com... >I have built a few dozen regen receivers and they all seem to work well > enough on AM signals--some extremely well--but kind of fall apart when > it comes to STABLE reception of CW and SSB. > > Has anyone ever built a solid state regen that does well with CW and > SSB? If so I would love to know how you did it (I'd even share my some > of my massive collection of radio parts with you)...before I go off and > build another dozen regens. > > I have a box full of prototypes affectionately dubbed my radio reject > graveyard (or dead radio pile)...I just don't want to be up to my neck > in more prototypes before I finally get a good one. > > Seriously thinking of skipping it and building a simple DC or superhet. > > Bruce Kizerian kk7zz > www.elmerdude.com > Article: 94203 of rec.radio.amateur.homebrew From: xxx Subject: Motorola RF Power Transistors??? Date: Thu, 25 Aug 2005 11:55:01 +0930 Message-ID: I have acquired some Motorola RF power transistors srf 1076,srf1077 and srf1800 does anyone have any info datasheets or even know where they were used??? Any help would be appreciated. Greg vk5xgh vk5xgh@nospamaztec.aunz.com remove nospam Article: 94204 of rec.radio.amateur.homebrew From: "Tom Holden" References: <9eaMe.614039$cg1.103783@bgtnsc04-news.ops.worldnet.att.net> <11g2d14ic142b3c@corp.supernews.com> <82ac1$4302584b$4232bdaa$20550@COQUI.NET> <11g76bkik7pa515@corp.supernews.com> Subject: Re: RadioShack Catalog Message-ID: <5K9Pe.641$Rc.306027@news20.bellglobal.com> Date: Wed, 24 Aug 2005 22:08:00 -0400 "john graesser" wrote in message news:11g76bkik7pa515@corp.supernews.com... > > I recall a UP story a couple of weeks ago that stated RS had 50 million > profit off of over 1 billion in sales. So they are selling a hell of a lot > but barely staying in the black. 1/2 of 1 percent profit? Even a passbook > savings acct gets a better return than that. 50 x10^6 / 10^9 * 100% = 5% - that's not so bad Article: 94205 of rec.radio.amateur.homebrew From: Ian Liston-Smith Subject: Re: Op amp supply-rail question Date: Thu, 25 Aug 2005 11:52:25 +0100 Message-ID: References: <312eg1he7tdtr9tvanovs7ek3n8q7f8efi@4ax.com> Thanks to all who have replied. I've certainly got some ideas now. On Wed, 24 Aug 2005 23:14:02 -0700, "Dana H. Myers" wrote: >Ian Liston-Smith wrote: >> I'd like to build a tone control circuit using the LF353 dual op amp. >> The circuit has bass, mid range and treble adjustments. >> >> The problem: >> The circuit (see >> http://www.ece.ucsb.edu/courses/ECE002/2C_Su05Makaremi/lf353.pdf >> circuit on page 7) uses dual voltage rails of +15 and -15 volts, >> though for line input levels, this will probably work down to +8 and >> -8 volts. But I want to run it from a single +12 volt supply. >> >> Usually, two 100k resistors across the supply, > >What is magical about 100k? Article: 94206 of rec.radio.amateur.homebrew From: "Heytubeguy" Subject: fa: Last hours: Vac Fixed Caps... Message-ID: <95kPe.133544$5N3.98453@bgtnsc05-news.ops.worldnet.att.net> Date: Thu, 25 Aug 2005 13:55:17 GMT See at : http://search.ebay.com/_W0QQfgtpZ1QQfrppZ25QQsassZheytubeguy other items being added as well, check back , tnx 73 heytubeguy Article: 94207 of rec.radio.amateur.homebrew From: "Caveat Lector" Subject: Help on 4CX1500B Data Message-ID: Date: Thu, 25 Aug 2005 08:37:21 -0700 Jose CT1FSL e-mailed for help on an amplifier project Can someone help him? Hi i'm making an amplifire with 2 4cx1500b tubs but i need info about the soket conections, can helpe me? I need to know were to conect grid, scrin an catode in soket tube, need the schematikes for the tube soket, can help on this? thanks jose ct1fsl His e-mail is ct1fsl Thanks -- CL -- I doubt, therefore I might be ! Article: 94208 of rec.radio.amateur.homebrew From: "Harold E. Johnson" References: Subject: Re: Help on 4CX1500B Data Message-ID: Date: Thu, 25 Aug 2005 15:57:15 GMT "Caveat Lector" wrote in message news:QAlPe.961$mH.733@fed1read07... > Jose CT1FSL e-mailed for help on an amplifier project > Can someone help him? > > Hi I use the tube, I'll take care of it. W4ZCB Article: 94209 of rec.radio.amateur.homebrew From: "Caveat Lector" References: Subject: Re: Help on 4CX1500B Data Message-ID: Date: Thu, 25 Aug 2005 09:49:51 -0700 Wow thanks much folks Helps meet our charter §97.1 Basis and purpose. (e) Continuation and extension of the amateur's unique ability to enhance international goodwill. -- CL -- I doubt, therefore I might be ! "Harold E. Johnson" wrote in message news:vTlPe.280657$_o.178581@attbi_s71... > > "Caveat Lector" wrote in message > news:QAlPe.961$mH.733@fed1read07... >> Jose CT1FSL e-mailed for help on an amplifier project >> Can someone help him? >> >> Hi > > I use the tube, I'll take care of it. > > W4ZCB > Article: 94210 of rec.radio.amateur.homebrew From: "Tom" References: <1125008389.118793.289820@g14g2000cwa.googlegroups.com> Subject: Re: The Perfect Ham Store? Message-ID: Date: Thu, 25 Aug 2005 22:51:14 GMT wrote in message news:1125008389.118793.289820@g14g2000cwa.googlegroups.com... > All, > > I know this sounds like a troll, but it is not, I assure you. I am at > a point where I may be forced to consider a career change. My wife > wants to teach at a reservation for the next several years, and as I do > not see very many days left in my 20 odd-year career as a software > designer, I am very much tempted to take her up on this. > > Since I have a had an abiding interest in building amateur gear from > parts, and since I hear a lot of complaints on this group about certain > retail chains not being responsive to amateurs, I thought I should do a > little bit of "market research" and ask my potential customers what > they might want to see from my store if I should start one. Have you considered military/industry surplus/salvage along the lines of Fair Radio Sales in Ohio or Skycraft Parts in Florida? I can't speak for Fair but Skycraft turns in a very handsome profit six days a week year after year and they are always crowded with patrons from kids building a crystal set to aerospace engineers. There are breaks for a salvage operation as well. Maybe it would be worth you while to visit them. DRMS (Defense Reutilization and Marketing Service) http://www.drms.dla.mil/ Article: 94211 of rec.radio.amateur.homebrew From: "Mr Fed UP" References: <1125008389.118793.289820@g14g2000cwa.googlegroups.com> Subject: Re: The Perfect Ham Store? Message-ID: Date: Thu, 25 Aug 2005 18:25:57 -0500 Ok.... you asked for it... lol New hams and lots of us OT's have been frustrated at the hodge podge arrangement of radios and accessories. Why the new person always asks is what should I buy..... The ad's and tech info on the products need to have a "boiled" down list of what it takes to make it all work. i.e. examples of radio antenna match need? Power supply? key? mic? Amp? Vertical ? Slope? dipole? random wire. Play radio only at home or in car too. Poor lids. :-( and the whole works for recommended uses like DX or contest or just rag chew. Maybe several "typical STATION set ups for a few ranges of total cost" Even for an OT you just cant tell from the ad's what it's going to cost in the end or what it will do or not do very well. Hope your career lasts a while... seeing all the sw jobs going over seas just like the mfg jobs have. Hope they plan to sell the products over seas... no one here will have a job/money to buy it. Load Accumulator what? Which mag core ? tube! Reset!!!! Sure ain't C or what ever else has come along in the last 10 years since I got to retire and play with my toys. LOL A straight key is the one for the ignition huh? Good luck 73 K4TWO A good Elmer list of hams who can show off their stations and be able to "guide" a new person into the hobby without going broke and with enough knowledge that what ever the Elmer is showing has taken a good while to accumulate. What ever station you build... its never right forever so it is a life time job of rebuilding the new station for the new and varied aspects of ham radio. Even the ARRL handbook is an accumulation of many folks efforts. Ham Radio is just TOO big to be a master of all the hobby. (although some declare that they are LOL) I didn't have an Elmer so many years back as a novice, I was pizzzed off for 2 years before I learned that DX didn't live in my novice band. P.S. Make it all free, won't last long but be big hit. You do plan on a web site eh? I have bought most of my recent "ham stuff" on ebay or other places on the web. By the time I spend gas and time shopping or going to hamfests, I can have the same items shipped the next day. Just won four 50mhz crystal mobile rigs for $6 costs more to ship them than the purchase fee from ebay auction. But look out 6m here I come. Tune Tweek Diddle Diddle smoke. I need a big garage. Need good pictures / prices and web site to sell these days. Most commercial places are too cheap (price fixing?) to put prices in mag' advert's and web advert's some dont even put an email address up due to spam and customers that are unhappy. Yeah, I got my rag chew award a long time back lol A copy of an email I sent to the ARRL recently below:>>>> ALL the files and adverts I see in QST or on the web can drowned and overwhelm a new ham. What is ALWAYS missing is "what this radio needs to work is.... AC line... DC power supply... Antenna match... Types of Antennas a user might connect. Sheeez get some of the basics out to the "New Hams" they want to sell these things too. Let them know about how much MORE it is going to cost than the listed price of the current unit under test. How about a Key or Speaker or Mic, need a rotor?.... Come on lets get the newbies a chance to spend his few dollars with out getting a box and then wish for Christmas to come so he/she can connect it up and really get on the air. Go look at the advert's and "reviews" as though you were NEW to the hobby and about to invest some hard earned money. While most of the tech info can be impressive, it is fluff to a newbie. Just tell me how it worked and what needed to make it usable. How much were all those "options they said were available?" Money for what filter? What warrantee??? It is the price of a car is it 5 years too? Thanks.... Hope this message gets to where it will do some good. Might even put some "shop and compare tables" out for them. I been around a long time and was getting ready to upgrade from my GTX757II to a "last good radio" for my retired years and wading through all the poo has just about put me off buying another radio. I did apply for a new 4 land call for retired call... I hope Vanity call. Can get a little vain when that's all that is left. hihi I just spent 2 days rebuilding the optical dial that froze up in my 757 so I better move on before it gets arthritis again. Now WHAT to buy?? eh wrote in message news:1125008389.118793.289820@g14g2000cwa.googlegroups.com... > All, > > I know this sounds like a troll, but it is not, I assure you. I am at > a point where I may be forced to consider a career change. My wife > wants to teach at a reservation for the next several years, and as I do > not see very many days left in my 20 odd-year career as a software > designer, I am very much tempted to take her up on this. > > Since I have a had an abiding interest in building amateur gear from > parts, and since I hear a lot of complaints on this group about certain > retail chains not being responsive to amateurs, I thought I should do a > little bit of "market research" and ask my potential customers what > they might want to see from my store if I should start one. > > I know that I can't be all things to all people, and I also know from > Idiots Guide to Starting a Business that retail sales can be a tough > row to hoe. > > My few advantages are that I would (hopefully) thoroughly know my > product, that I would be organized where a lot of scrap shops aren't, > that I would listen to what the customer wants, and that I wouldn't be > going into this simply for sentimental reasons but hopefully to make a > small profit to supplement my wife's earnings > > So, what is the perfect homebrewer store for you all? > > 1) Lots of discretes at low prices? > 2) Transceiver and other kits sold at slight markup? > 3) Parts kits and boards for successful homebrew designs found on the > net? > 4) A depot to drop off and buy antique gear and test equipment? > 5) Home-made precision such as crystal filters, diode mixers, amplifier > modules? > > Anything I haven't thought of? > > Thanks, > > The Eternal Squire > Article: 94212 of rec.radio.amateur.homebrew From: et472@FreeNet.Carleton.CA (Michael Black) Subject: Re: The Perfect Ham Store? Date: 26 Aug 2005 01:18:53 GMT Message-ID: References: <1125008389.118793.289820@g14g2000cwa.googlegroups.com> (eternalsquire@comcast.net) writes: > All, > > I know this sounds like a troll, but it is not, I assure you. I am at > a point where I may be forced to consider a career change. My wife > wants to teach at a reservation for the next several years, and as I do > not see very many days left in my 20 odd-year career as a software > designer, I am very much tempted to take her up on this. > > Since I have a had an abiding interest in building amateur gear from > parts, and since I hear a lot of complaints on this group about certain > retail chains not being responsive to amateurs, You do realize that for some reason people like to gripe about Radio Shack. They have contempt for the place, while all the while expecting it to deal with them. Radio Shack hasn't been a main place to buy parts since a few years after Tandy bought it in the sixties. Selection was/is limited and prices high. They were a great place to get something quick, because a store would likely be nearby, and a place to get them in the off hours. But just because people like to gripe about Radio Shack doesn't mean a thing about the state of buying parts generally. Note they are griping at one store, not talking about other places. There are plenty of places to buy parts. Sadly they may not be in a cluster downtown in your city, which was the case decades ago. But they still exist. Some places have risen up to deal with specialty items, filling a void that is missing. Amidon is a classic example, starting at a time when toroids were virtually unknown, and being the standard for buying the cores in small quantities (be it the hobbyist or the prototyper). So you really need to not be looking at the griping at Radio Shack, or Radio Shack itself, but at what exists today and whether it can fill the market, or if there are gaps that need filling. Michael VE2BVW Article: 94213 of rec.radio.amateur.homebrew From: "Reg Edwards" Subject: Re: The Perfect Ham Store? Date: Fri, 26 Aug 2005 01:57:44 +0000 (UTC) Message-ID: References: <1125008389.118793.289820@g14g2000cwa.googlegroups.com> Don't forget the 3-feet cardboard box filled with junk. Article: 94214 of rec.radio.amateur.homebrew From: "Greysky" References: <9eaMe.614039$cg1.103783@bgtnsc04-news.ops.worldnet.att.net> <11g2d14ic142b3c@corp.supernews.com> Subject: Re: RadioShack Catalog Message-ID: Date: Fri, 26 Aug 2005 02:35:31 GMT "Geoffrey S. Mendelson" wrote in message news:slrndg32go.ija.gsm@cable.mendelson.com... > In article , > clfe wrote: > >> Sadly, I think them doing that - is wishful thinking. Actually, were it >> not >> for the Cell Phones and some other miscellaneous items, it seems to me >> that >> they would be out of business in the not too distant future. Electromics >> "toys" - can be had at Wal-Mart or any other place, same with TVs, >> Stereos, >> Computers and phone accessories. The "few" scanners they sell isn't >> enough >> to hold them. I really do think they're on their last legs. IF they go on >> longer, then all the better. But I think it is going to take a major >> miracle >> to pick them up. I used to go in a RS store at least 3 times a week. I'm >> lucky if I walk in one - once every couple months. They simply have >> nothing >> to offer me anymore. I can get all they have - elsewhere, and usually >> cheaper - WITHOUT - the "Do you need a cell phone?" pitch. > > Last night I was watching on cable a movie made in 1997 about Star Trek > fans. One of the fans builds things. It showed him going into a Radio > Shack store and asking for parts and electronics help (should I use > a 270 oHm resistor instead of the 3k?). > > The back of the store was a maze of parts racks, and they guy knew the > answers. > > As Joani Mitchell once said "you don't realize what you've lost until it's > gone". > > Geoff. > Yeah. I remember when they were getting rid of all those paperback electronics books, you know like "Op amp Circuits" and "NAND Gate circuits", and a bunch of ones by Carr. They were obsoleting the entire line for 25 cents a book. I still have dozens and dozens of those books in my closet somewhere. Old friends indeed..." Greysky Article: 94215 of rec.radio.amateur.homebrew From: xrenfredm@hotmail.com (Renfred) Subject: Manual for MFJ-1276 TNC? Message-ID: <430ee8a5.23133834@news.xtra.co.nz> Date: Fri, 26 Aug 2005 10:03:38 GMT Anyone out there got a manual for one of these? Sure would appreciate it if someone can dig one out or has a copy in Adobe pdf. Many thanks, Renfred. Remove (X) from xrenfred for correct email address...thanks. Article: 94216 of rec.radio.amateur.homebrew From: "William E. Sabin" Subject: Homebrew radio Message-ID: Date: Fri, 26 Aug 2005 11:14:55 GMT The QRZ.com for W0IYH has several improvements to the brief discussion, if anyone is interested. Bill W0IYH Article: 94217 of rec.radio.amateur.homebrew From: "Charles Brabham" References: <1125021564.645647.111070@g43g2000cwa.googlegroups.com> Subject: Re: HamPoll.Com Message-ID: Date: Fri, 26 Aug 2005 11:58:36 GMT "WN0BFS/3" wrote in message news:1125021564.645647.111070@g43g2000cwa.googlegroups.com... > > Charles Brabham wrote: >> HamPoll is here in order to give amateurs a chance to speak for >> themselves, >> blah blah etc. and so forth. > > Kewl websight, CB. > > So, if the browser window is smaller than the text, > the pour ham is sposed to GUESS whats' at the bottom? I found and fixed the problem you mentioned... Now I can shrink it down pretty small, and it is still usable. ( Not much I can do about the forum though...) Thanks for the 'heads up"! Charles Brabham, N5PVL Director: USPacket http://www.uspacket.org Admin: HamBlog.Com http://www.hamblog.com ---------- HamPoll.Com http://www.hampoll.com ---------- DigiBlog http://www.uspacket.org/digiblog/ Article: 94218 of rec.radio.amateur.homebrew From: "Harold E. Johnson" References: Subject: Re: Homebrew radio Message-ID: Date: Fri, 26 Aug 2005 13:11:41 GMT > The QRZ.com for W0IYH has several improvements to the brief discussion, if > anyone is interested. > > Bill W0IYH You do great photo work as well Bill, that's the sharpest image I think I've I've ever seen on QRZ. Can almost see where you're tuned to! Looking forward to finding you on the bands again, will certainly recoignize the call next time instead of trying to think of where I've heard it before. My modified IYH MRF-150's are alive and doing well, been a couple years now, so I think they're in for the long haul. How do you operate without a monitorscope? Mine is on whenever the rig is on. Instant reminder when I've forgotten which antenna is selected and the like. (Haven't yet modified my little STAR to automate that process like I had on my Signal One.) Regards W4ZCB Article: 94219 of rec.radio.amateur.homebrew From: "William E. Sabin" References: Subject: Re: Homebrew radio Message-ID: Date: Fri, 26 Aug 2005 14:09:33 GMT I have a new Sony digital camera 7.2 megapixel that I have been slowly learning how to use. I shoot pix using a tripod and max megapixel (20 megabytes), then I use a program that creates an optimum JPEG file that QRZ.com prefers that is a little less than 500 kilobytes. I use an external diffused flash that works quite well, attached to the Sony. I can shoot a dozen pix and delete all but the one I want (at no cost for film and developing). My push pull MRF150 PA has been faultless for more than 4 years. I clean out the dust occasionally. The protection circuits all work quite well. Ameritron has a new 600 W PA that uses 4 MRF150s. I don't want to live that dangerously. My ancient 30L-1 works beautifully at 600 W. At 800 W it starts to deteriorate, so just 1.25 dB of ALC keeps it happy. The 572B tubes are Chinese from RF Parts in L.A., but they use American made thoriated tungsten filaments and seem to be quite reliable when not abused. A matched quad costs about $200. I have everything I need to keep everything working OK but I don't need to keep it all connected all the time. Bill W0IYH "Harold E. Johnson" wrote in message news:hyEPe.281437$x96.127319@attbi_s72... >> The QRZ.com for W0IYH has several improvements to the brief discussion, >> if >> anyone is interested. >> >> Bill W0IYH > You do great photo work as well Bill, that's the sharpest image I think > I've > I've ever seen on QRZ. Can almost see where you're tuned to! Looking > forward > to finding you on the bands again, will certainly recoignize the call next > time instead of trying to think of where I've heard it before. > > My modified IYH MRF-150's are alive and doing well, been a couple years > now, > so I think they're in for the long haul. How do you operate without a > monitorscope? Mine is on whenever the rig is on. Instant reminder when > I've > forgotten which antenna is selected and the like. (Haven't yet modified my > little STAR to automate that process like I had on my Signal One.) > > Regards > W4ZCB > > > Article: 94220 of rec.radio.amateur.homebrew From: "xpyttl" References: <1125008389.118793.289820@g14g2000cwa.googlegroups.com> Subject: Re: The Perfect Ham Store? Message-ID: Date: Fri, 26 Aug 2005 10:43:46 -0400 wrote in message news:1125008389.118793.289820@g14g2000cwa.googlegroups.com... > little bit of "market research" and ask my potential customers what > they might want to see from my store if I should start one. Of course, market guidance is a good thing, but keep in mind that this newsgroup is probably far from representative. > So, what is the perfect homebrewer store for you all? DigiKey, with some RF parts added. > 1) Lots of discretes at low prices? There are lots of places to get discretes. This is no longer the problem it used to be. The problem is getting them at a local store. RS used to fill that bill, and there used to be a number of local electronics retailers. But to tap that market, you need to be everywhere. In a market large enough to justify that sort of presence, there are already competitors. > 2) Transceiver and other kits sold at slight markup? What can you offer that AES and the like can't? Unfortunately, I think a lot of stores suffer from spending time helping folks understand the products, only to have the customer go get it at Texas Towers for five bucks less. Hams are cheap. If you are going to sell transceivers you gotta be near the lowest price. Now maybe a wide range of kits might be a market with little competition. > 3) Parts kits and boards for successful homebrew designs found on the > net? There are a lot more homebrew possibilities out there than there are kits, but that is a pretty low margin market. Still, I wonder if something simple like providing parts kits for FAR Circuits boards might not be a possibility. Provide a needed service and keep your costs down by leveraging someone else's board mill. > 4) A depot to drop off and buy antique gear and test equipment? Again, you need to be everywhere. If your wife plans on working on a reservation, it sounds like the place you will be might be a pretty small market. > 5) Home-made precision such as crystal filters, diode mixers, amplifier > modules? Filters might work. Mixers, amps etc are already available from Minicircuits. But filters for common homebrew IFs might be a market. > Anything I haven't thought of? One thing that occurs to me is that almost any project nowadays involves a microcontroller of some type, typically a PIC or AVR. Even though programmers are trivial to build, the need for a programmed micro is a show stopper for a lot of potential builders. That might make an interesting niche. Take a look at the successful guys. DigiKey has almost a half million SKUs. Although they are shy on RF parts, for almost anything else you want they are gonna have it. They have a fabulous search facility on their website and the best customer service on the planet. Their prices might not be the best, but they make up for it by being terribly easy to deal with. AES is an expert at lightening your wallet. Their prices are pretty low, when you call them you will talk to someone who knows what it is you want. And the next day the rig shows up on your doorstep. Simple, painless, and close to the lowest price. Ever call International Crystal for a crystal? Their prices may be high, but they will make sure you get exactly what you need. If you have a commercial radio, no matter how obscure, they know what kind of crystal it takes. Doing something weird? Tell them about your circuit. They are dedicated to getting you what you need. If you are going to be out in the boondocks, like it sounds, then you need something you can do online. The good news is that is relatively cheap. The bad news is that now you are competing with an entire planet full of competitors, so you need to come up with something really unique. .. Article: 94221 of rec.radio.amateur.homebrew Subject: Re: Manual for MFJ-1276 TNC? From: Ed References: <430ee8a5.23133834@news.xtra.co.nz> <430F1137.8010207@bloomer.net> Message-ID: Date: Fri, 26 Aug 2005 17:01:50 GMT > For some reason, I didn't see a manual for an MFJ-1276 at the MFJ > website. Double check which model you have and you can search the MFJ > site again. They have pdf manuals for bunches of their products, so I'm > wondering why I didn't see one for a 1276... > > http://www.mfjenterprises.com/manuals.php > > Scott > N0EDV I couldn't find the 1276 manual listed on MFJ's website, either. However, if it were me, I'd either call their 800 number, or email them with the question. They are very good at responding. Ed K7AAT Article: 94222 of rec.radio.amateur.homebrew From: "Tom" References: <1125008389.118793.289820@g14g2000cwa.googlegroups.com> Subject: Re: The Perfect Ham Store? Message-ID: Date: Fri, 26 Aug 2005 17:31:37 GMT wrote in message news:1125008389.118793.289820@g14g2000cwa.googlegroups.com... > All, > > I know this sounds like a troll, but it is not, I assure you. I am at > a point where I may be forced to consider a career change. My wife > wants to teach at a reservation for the next several years, and as I do > not see very many days left in my 20 odd-year career as a software > designer, I am very much tempted to take her up on this. > > Since I have a had an abiding interest in building amateur gear from > parts, and since I hear a lot of complaints on this group about certain > retail chains not being responsive to amateurs, I thought I should do a > little bit of "market research" and ask my potential customers what > they might want to see from my store if I should start one. I was reading the responses to your post when a thought prompted me to add another comment. The electronics market for the amateur in Japan is exceedingly more developed that what it is here in the US. Every now and then I hear of interesting amateur equipment, electronics devices and parts that, for some reason, are not available in the US---I sure would like to have one of those Sony automobile receivers with short-wave. Heaven knows what they have for the computer hobbyist. Possibly, an import operation of sort can fill the void---an interesting niche. For the life of me I can't remember what part of Tokyo the famous electronics district is in. Maybe I shouldn't have posted this---the idea sounds good to me too. Article: 94223 of rec.radio.amateur.homebrew From: craigm Subject: Re: The Perfect Ham Store? References: <1125008389.118793.289820@g14g2000cwa.googlegroups.com> Message-ID: <9oJPe.15483$1g2.13753@fe05.lga> Date: Fri, 26 Aug 2005 13:42:10 -0500 Tom wrote: > wrote in message > news:1125008389.118793.289820@g14g2000cwa.googlegroups.com... > >>All, >> >>I know this sounds like a troll, but it is not, I assure you. I am at >>a point where I may be forced to consider a career change. My wife >>wants to teach at a reservation for the next several years, and as I do >>not see very many days left in my 20 odd-year career as a software >>designer, I am very much tempted to take her up on this. >> >>Since I have a had an abiding interest in building amateur gear from >>parts, and since I hear a lot of complaints on this group about certain >>retail chains not being responsive to amateurs, I thought I should do a >>little bit of "market research" and ask my potential customers what >>they might want to see from my store if I should start one. > > > I was reading the responses to your post when a thought prompted me to add > another comment. The electronics market for the amateur in Japan is > exceedingly more developed that what it is here in the US. Every now and > then I hear of interesting amateur equipment, electronics devices and parts > that, for some reason, are not available in the US---I sure would like to > have one of those Sony automobile receivers with short-wave. Heaven knows > what they have for the computer hobbyist. Possibly, an import operation of > sort can fill the void---an interesting niche. > > For the life of me I can't remember what part of Tokyo the famous > electronics district is in. Akihabara > > Maybe I shouldn't have posted this---the idea sounds good to me too. > > Article: 94224 of rec.radio.amateur.homebrew From: "Reg Edwards" Subject: Re: A Weekly F.A.Q. - What Is Ham Radio? Date: Fri, 26 Aug 2005 19:28:58 +0000 (UTC) Message-ID: References: <1125082573.078138.29130@g47g2000cwa.googlegroups.com> "Polymath" wrote > Ham Radio is a technical pursuit for those who > are interested in the science of radio wave > propagation and who are also interested in the > way that their radios function. It has a long-standing > tradition of providing a source of engineers who > are born naturals. ============================= I do not wholely agree. There are many radio amateurs who are, or have been, professional engineers, not necessarily radio engineers, who contribute in their many various ways towards the hobby. 'Hobby' is perhaps not the best of descriptions. It is an international affair. ---- Reg, G4FGQ Article: 94225 of rec.radio.amateur.homebrew From: "..." <..@..> References: <1125082573.078138.29130@g47g2000cwa.googlegroups.com> Subject: Re: A Weekly F.A.Q. - What Is Ham Radio? Date: Fri, 26 Aug 2005 20:46:53 +0100 Message-ID: <430f71f9$0$97132$ed2619ec@ptn-nntp-reader03.plus.net> why is amateur radio not a hobby ? Definition of a hobby A spare-time recreational pursuit "Reg Edwards" wrote in message news:denqhq$gem$1@nwrdmz01.dmz.ncs.ea.ibs-infra.bt.com... > > "Polymath" wrote > > Ham Radio is a technical pursuit for those who > > are interested in the science of radio wave > > propagation and who are also interested in the > > way that their radios function. It has a long-standing > > tradition of providing a source of engineers who > > are born naturals. > > ============================= > > I do not wholely agree. > > There are many radio amateurs who are, or have been, professional > engineers, not necessarily radio engineers, who contribute in their > many various ways towards the hobby. > > 'Hobby' is perhaps not the best of descriptions. It is an > international affair. > ---- > Reg, G4FGQ > > Article: 94226 of rec.radio.amateur.homebrew From: "Reg Edwards" Subject: Re: The Perfect Ham Store? Date: Fri, 26 Aug 2005 22:18:53 +0000 (UTC) Message-ID: References: <1125008389.118793.289820@g14g2000cwa.googlegroups.com> <1125081915.412415.325230@g44g2000cwa.googlegroups.com> The civilised Japanese, technologically and socially, are much in advance of the so-called western democracies, excepting perhaps the Scandinavians. The Chinese and Indians are very rapidly catching up. In the meantime, the well-armed Americans are slowly descending into civil war. Article: 94227 of rec.radio.amateur.homebrew From: "Frank" References: Subject: Re: HP 8558B Analyser Problem - Help Needed Message-ID: Date: Fri, 26 Aug 2005 22:36:12 GMT "John A" wrote in message news:deihdb$m2g$1@news8.svr.pol.co.uk... > See > > http://homepage.eircom.net/~ei9gq/spec2.jpg > > > for a screen shot. Assume the center is a zero frequency. Looks suspiciously like LO IF overload to me. Try a 10 dB pad in the mixer output -- should be easy to get at. As you mentioned there may be a mixer balance problem. I thought the HP8558B used to plug in a HP141T display, but found a pic on the web, and it appears to be a later generation. I have occasionally seen the results of transmitting directly into those old spectrum analyzers, and in the 70s, it was $1,000 for the attenuator, and $1,000 for the mixer. Sure hope you don't have that kind of problem. Regards, Frank Article: 94228 of rec.radio.amateur.homebrew From: "Tom" References: <1125008389.118793.289820@g14g2000cwa.googlegroups.com> <1125081915.412415.325230@g44g2000cwa.googlegroups.com> Subject: Re: The Perfect Ham Store? Message-ID: Date: Sat, 27 Aug 2005 00:25:42 GMT wrote in message news:1125081915.412415.325230@g44g2000cwa.googlegroups.com... > Tom, > > The district in question is the Ahikhabara (sp?). From what I have > heard and read it is the largest elex flea-market in the world. > > There is also the possibility that we could import discretes and other > parts directly from small shops in India and China. > > The only problem is that it seems that US Customs import duties for > electronics coming in from Japan are rather punitive to small-time > operators. Maybe I am wrong. > > Maybe you and I should go into this one together :) Yes... thanks to craigm as well, it is Akihabara. Here are some web pages: Akihabara News: http://www.akihabaranews.com/en/ Akihabara homepage: http://www.akiba.or.jp/index_e.html http://www.akiba.or.jp/english/ Article: 94229 of rec.radio.amateur.homebrew From: "Bill Sohl" References: <1125082573.078138.29130@g47g2000cwa.googlegroups.com> <430f71f9$0$97132$ed2619ec@ptn-nntp-reader03.plus.net> Subject: Re: A Weekly F.A.Q. - What Is Ham Radio? Message-ID: Date: Sat, 27 Aug 2005 02:36:38 GMT On the individual/personal level, for a great many of us it IS a hobby. Strictly speaking, however, amateur radio is, by FCC rules definition, a service. Cheers, Bill K2UNK "..." <..@..> wrote in message news:430f71f9$0$97132$ed2619ec@ptn-nntp-reader03.plus.net... > why is amateur radio not a hobby ? > > Definition of a hobby > > A spare-time recreational pursuit > > > "Reg Edwards" wrote in message > news:denqhq$gem$1@nwrdmz01.dmz.ncs.ea.ibs-infra.bt.com... >> >> "Polymath" wrote >> > Ham Radio is a technical pursuit for those who >> > are interested in the science of radio wave >> > propagation and who are also interested in the >> > way that their radios function. It has a long-standing >> > tradition of providing a source of engineers who >> > are born naturals. >> >> ============================= >> >> I do not wholely agree. >> >> There are many radio amateurs who are, or have been, professional >> engineers, not necessarily radio engineers, who contribute in their >> many various ways towards the hobby. >> >> 'Hobby' is perhaps not the best of descriptions. It is an >> international affair. >> ---- >> Reg, G4FGQ >> >> > > Article: 94230 of rec.radio.amateur.homebrew From: "Mr Fed UP" References: <1125008389.118793.289820@g14g2000cwa.googlegroups.com> <1125081915.412415.325230@g44g2000cwa.googlegroups.com> <2s2dnZ2dnZ24ZZfxnZ2dnVgGkt6dnZ2dRVnyqZ2dnZ0@pipex.net> Subject: Re: The Perfect Ham Store? Message-ID: Date: Sat, 27 Aug 2005 02:07:54 -0500 "Highland Ham" wrote in message news:2s2dnZ2dnZ24ZZfxnZ2dnVgGkt6dnZ2dRVnyqZ2dnZ0@pipex.net... snipped.. > In western european countries there are a number of traders selling > surplus components incl RF parts ,who move from fleamarket to fleamarket > ,from country to country. A number buy surplus army kit from eastern > europe and sell these as components...........................they have > done that for many years ,hence must have a reasonable income from these > activities . > I have seen a web site related to the sale (auction) of US Government > equipment (located in Virginia) with some mouthwatering electronic > (test)equipment . There should be a market for this equipment ,even as > components. > Frank GMØCSZ / KN6WH. FYI: I was watching the "US Government" site a while and found the auctions exceeded anything I would call a "deal on equipment" The site is http://www.govliquidation.com/index.html I don't know how it would work for an overseas buyer though, 73 K4TWO Gary Article: 94231 of rec.radio.amateur.homebrew From: xrenfredm@hotmail.com (Renfred) Subject: Re: Manual for MFJ-1276 TNC? Message-ID: <431012f1.38057804@news.xtra.co.nz> References: <430ee8a5.23133834@news.xtra.co.nz> <430F1137.8010207@bloomer.net> Date: Sat, 27 Aug 2005 07:16:35 GMT Thanks for your input Scott and Ed. I did have a look at their website before posting and also noticed that the only one missing was the one I have! Murphy's Law.......I will take your advice and try emailing them Thanks guys. Cheers, Renfred. ZL1BDL On Fri, 26 Aug 2005 17:01:50 GMT, Ed wrote: > >> For some reason, I didn't see a manual for an MFJ-1276 at the MFJ >> website. Double check which model you have and you can search the MFJ >> site again. They have pdf manuals for bunches of their products, so I'm >> wondering why I didn't see one for a 1276... >> >> http://www.mfjenterprises.com/manuals.php >> >> Scott >> N0EDV > > > I couldn't find the 1276 manual listed on MFJ's website, either. >However, if it were me, I'd either call their 800 number, or email them >with the question. They are very good at responding. > > > Ed K7AAT Remove (X) from xrenfred for correct email address...thanks. Article: 94232 of rec.radio.amateur.homebrew From: "Wim Ton" Subject: HP141T Repair Message-ID: Date: Sat, 27 Aug 2005 08:52:06 GMT I got a HP141T with 8554B and 8552B plugins. After replacing some transistors and fuses in the powersupply, I decided on a careful power up with a Variac There is some light on the CRT and a horizontal sweep at the top of the screen (I suppose the picture is out of alignment because of the incorrect voltages) It turns out that the ribbon cable to the CRT anode and storage electrodes is split open and arching between 2 wires, even without the full mains power applied. Any suggestings on: Where to get a new cable? How to repair them? How to remove the CRT, as this is not mentioned in the service manual I downloaded from BAMA. Thanks in advance, Wim Article: 94233 of rec.radio.amateur.homebrew From: "xpyttl" References: <1125008389.118793.289820@g14g2000cwa.googlegroups.com> <1125081915.412415.325230@g44g2000cwa.googlegroups.com> <2s2dnZ2dnZ24ZZfxnZ2dnVgGkt6dnZ2dRVnyqZ2dnZ0@pipex.net> <430FEFAC.2070008@invalid.invalid> <1125125215.194247.199450@g43g2000cwa.googlegroups.com> Subject: Re: The Perfect Ham Store? Message-ID: Date: Sat, 27 Aug 2005 06:54:23 -0400 wrote in message news:1125125215.194247.199450@g43g2000cwa.googlegroups.com... > than 700 hardcore homebrewers. Can that be right, only 700 of us > potentially on this newsgroup? I don't know about "hardcore", but many AmQRP kits sell that many in the first week. OK, you could say that a kit really isn't homebrew. But there are a lot of people out there who like to melt solder. > and expenses. 210 sales per year X $1 per kit is $210 per year. Not > good! Hardly cover the state's cut for licenses. .. Article: 94234 of rec.radio.amateur.homebrew From: "David J Windisch" Subject: 15-tube homebrew receiver for sale Message-ID: <6O_Pe.48873$2Q3.31183@tornado.ohiordc.rr.com> Date: Sat, 27 Aug 2005 14:30:26 GMT Hi, all concerned: This one was on ebay a while ago. Bids didn't get past the reserve, and I made an after-auction offer which was accepted. There was no information on what is inside. I've gotten as far as turning it on, listening on 40M, and documenting the tube lineup. Its general form is: 6AK5-6JH8-6JH8-6BJ6 X3-6AQ5, with l-o's, bfo, detectors, agc-amps, S-meter circuitry. The r-f stage has separate peaking. The 1st-lo is tuned by a smooooooth National PW-type drive The second i-f has provisions for 2 switched 9-pin plug-in-style mechanical filters and a "wide" position. Sri -- the filters are long gone. Power supply is internal, with plug-in solid-state rectifier and a couple of 0B2's. Line cord has one of those fused plugs which purist-collectors drool over. I don't have a pic of the bottom side; however, it's nicely homebrewed. Date codes on the tubes are '50s and '60s. All but two of the shields are those nice ones with dissipators inside. There are 5-pin plug-in coils for 80-10M, and extra BUD ceramic forms, in a box. Physically, it is H9"XW12" with tilt built in to the design, and 18" deep. It weighs around 30 lb. I have the ebay jpg's, which can be emailed to interested parties. My original intent was to find an "HBT-XX" homebrew transmitter to go with it, and the intent has fallen by the wayside. Oh, well . . . $300 plus about $40 for insured ground shipping to conus. 73, and tks for reading. Article: 94235 of rec.radio.amateur.homebrew From: "Roger Conroy" Subject: Re: The Perfect Ham Store? Date: Sat, 27 Aug 2005 18:06:03 +0200 Message-ID: References: <1125008389.118793.289820@g14g2000cwa.googlegroups.com> <1125081915.412415.325230@g44g2000cwa.googlegroups.com> <2s2dnZ2dnZ24ZZfxnZ2dnVgGkt6dnZ2dRVnyqZ2dnZ0@pipex.net> <430FEFAC.2070008@invalid.invalid> <1125125215.194247.199450@g43g2000cwa.googlegroups.com> wrote in message news:1125125215.194247.199450@g43g2000cwa.googlegroups.com... >I suppose we could use Drake's Law: I'd estimate that perhaps only 1 > in 10 Hams are interested in homebrewing, 1 in 10 have the skill, and 1 > in 10 have the means to stock up a large parts library: basically an > interested audience of 1 in 1000 hams, meaning an audience of no more > than 700 hardcore homebrewers. Can that be right, only 700 of us > potentially on this newsgroup? > > Although, if I provide the service of the homebrewer's parts library: > reasonable price, fast shipment, good ranges of discretes for 160-6 M > construction, then I could address up to 7000 hams who have both the > interest and skill who don't want to kit but do want to try something > new. > > If I bundle the parts kits with the FAR boards, I suppose I could > address the 1-3 additional people on the bottom end of the skill scale. > Now we have an audience of up to 21000 hams, a nice healthy audience. > > If only one of 100 hams in the kit audience buys a kit per year, then I > have only 210 sales per year. If the average parts kit cost me $50 and > I mark it up by $5 I only make about $1 of profit per kit after taxes > and expenses. 210 sales per year X $1 per kit is $210 per year. Not > good! > > Or are there things of which I am not considering. > > Yawn, > > The Eternal Squire Why limit your potential market to only the USA? Article: 94236 of rec.radio.amateur.homebrew From: Dr. Anton T. Squeegee Subject: Re: A Weekly F.A.Q. - What Is Ham Radio? Date: Sat, 27 Aug 2005 09:13:08 -0700 Message-ID: References: <1125082573.078138.29130@g47g2000cwa.googlegroups.com> In article <1125082573.078138.29130@g47g2000cwa.googlegroups.com>, aiyr.r.bean@lycos.co.uk says... > What is Ham Radio? Sooooo many more things than Airy R. Bean, no matter how he may have misspelled his name in the message headers, could ever imagine. > Radio Hams are in a unique privileged position in that > they can construct and operate their own equipment! No-one > else has this privilege. Users, such as broadcasters, > the po lice and armed farces, CBers and mobile phone ^^^^^^^^^^^^^ Isn't that what we have going on in Iraq at this very moment? > users have to purchase ready-made gear. Manufacturers > are not licensed to operate their gear. Radio Hams > are qualified to design, build and then > operate their own pieces of equipment. They do this A gross (and inaccurate) generalization. A great many hams I've met in recent years barely remember what Ohm's Law is, let alone how to do anything resembling design. They do indeed purchase their radios 'off-the-shelf,' talk about the things that matter to them on the air, however non-technical the subject matter may be, and often show up at radio club meetings. And you know what? The vast majority of them are very smart, very nice people who, while they're very interested in the public-service and volunteer emergency service aspects of amateur radio, and may have made significant contributions to the hobby and their community in other ways, may never have so much as learned how to pick up a soldering pencil. Lack of real electronics experience does not make someone with a ham license any less worthy of respect, Beany, no matter what you may believe. I say this as an amateur radio license holder for the last 27 years (first as WD6EOS, then later as KC7GR), and as a professional electronics engineering tech (for just about the same number of years). And, for the record: Yes, I've been tinkering with electronic and radio projects for most of my life. Many have said that amateur radio is a dying hobby. Personally, I don't believe that. However, if there is any grain of truth to such statements, it's not the lack of technical skill in SOME newcomers to the hobby that's hurting the hobby. What will quickly kill amateur radio will be expressing ongoing disrespect and hostility to those who choose to contribute to the service in non-technical ways. You don't need to know how to use a multimeter or whatever to be a good on-air operator, or to be of value in a disaster situation. You can continue to post whatever kind of misguided "FAQ" you want to, Beany-boy. It won't change the fact that I, at least, have seen enough of your previous rantings on Usenet over the last few years to know your true colors. *PLONK!* -- Dr. Anton T. Squeegee, Director, Dutch Surrealist Plumbing Institute. (Known to some as Bruce Lane, ARS KC7GR, kyrrin (a/t) bluefeathertech[d=o=t]calm -- www.bluefeathertech.com "If Salvador Dali had owned a computer, would it have been equipped with surreal ports?" Article: 94237 of rec.radio.amateur.homebrew From: Roy Lewallen Subject: Re: HP141T Repair Date: Sat, 27 Aug 2005 11:52:02 -0700 Message-ID: <11h1dijl5t06scb@corp.supernews.com> References: Wim Ton wrote: > Any suggestings on: > > Where to get a new cable? http://www.glkinst.com/cables/hp_cables.htm That was the first hit on a Google search of HP 141T cables Roy Lewallen, W7EL Article: 94238 of rec.radio.amateur.homebrew From: John Smith Subject: Re: A Weekly F.A.Q. - What Is Ham Radio? Message-ID: References: <1125082573.078138.29130@g47g2000cwa.googlegroups.com> <1125159811.400778.79320@f14g2000cwb.googlegroups.com> <4310BC91.5020508@NOSPAMw2agn.net> Date: Sat, 27 Aug 2005 12:31:18 -0700 John: How do you figure anyone here is for lowering standards? We are for bringing standards up-to-date and getting rid of archaic, seldom used methods and "historic concepts." No one is for reducing standards... indeed, how could standards fall much lower than where they exist now? Amateur radio is already decades behind technology... that should be nothing less than totally obvious--well, other than to the the totally clueless... John On Sat, 27 Aug 2005 15:18:41 -0400, John L. Sielke wrote: > Polymath wrote: >> Your Childish Broadcast (CB) below serves to >> classify you. >> >> Those whom you mention who are operators but >> who are non-technical are the CBers whom I warn >> against in the FAQ. >> >> Ham Radio is not about operating - that is CB Radio >> including CBers-Masquerading-As-Radio-Hams whom you >> repeatedly mention. >> >> I have never "ranted" on the Internet - I have only >> posted sincere and genuine concerns about the decline >> in Ham Radio by the influx of the very Childish >> Broadcasters (CBers) that you typify. >> >> If you have indeed been around for as long as you >> claim, then you should know better than to enjoin >> an international public forum in the rather >> silly and infantile style that you adopted. >> >> Shame on you. >> >> Stupid boy. >> >> Dr. Anton T. Squeegee wrote: >> >>>In article <1125082573.078138.29130@g47g2000cwa.googlegroups.com>, >>>aiyr.r.bean@lycos.co.uk says... >>> >>> >>>>What is Ham Radio? >>> >>> >>> > > Having read this thread, I must agree with the assessment that lowering > standards will NOT help Ham Radio. In the USA, the ARRL is doing its > best to turn the HF bands into an email forwarding facility, by pushing > regulations that will allow PACTOR II and III, used by the PROPRIETARY > SCS Modems, and Winlink, across ALL the bands. Soon there will be > nothing but robots, relaying email to and from the internet. Anyone who > can get a cereal-box license and is willing to spend $1000+ for the > modem, as well as whatever an HF rig will go for, will be able to use > the "ARRL HF Internet Service Provider." Article: 94239 of rec.radio.amateur.homebrew From: "Wim Ton" References: <11h1dijl5t06scb@corp.supernews.com> Subject: Re: HP141T Repair Message-ID: Date: Sat, 27 Aug 2005 21:26:52 GMT "Roy Lewallen" wrote in message news:11h1dijl5t06scb@corp.supernews.com... > Wim Ton wrote: > > Any suggestings on: > > > > Where to get a new cable? > > http://www.glkinst.com/cables/hp_cables.htm > > That was the first hit on a Google search of > > HP 141T cables > > Roy Lewallen, W7EL Thanks for the link! May come in handy when I have repaired the thing and found an affordabe tracking generator. Wim Article: 94240 of rec.radio.amateur.homebrew From: "Rightrik" Subject: Yaesu FL-7000 : what's the right price??? Date: Sun, 28 Aug 2005 00:07:01 +0200 Message-ID: <3nc6g3Fs6iiU1@individual.net> Hello, i would like to add a 500/600w solid state amplifier to my HF station (Kenwood TS870 & Kenwod TS-2000, sometimes Yaesu FT100d), possibly with an automatic antenna tuner. Yaesu FL-7000 seems to be the best choice for this needs, what do you think about it? What is the price of a good used? What's his most weak point to first-check before buying ? Thank you very much, Riccardo IK5WQO Article: 94241 of rec.radio.amateur.homebrew Message-ID: <4310F55B.8394D750@case_dude.com> From: case_dude Subject: Re: Desktop metal shielded PC case? References: <1116180057.598783.160160@g14g2000cwa.googlegroups.com> <11gks2kmtouq3fc@corp.supernews.com> <0s3pg1lmnlk3tqf8d6840lojpl3k1i1rg5@4ax.com> Date: Sat, 27 Aug 2005 23:21:00 GMT Many of the pc power supplies used in the clones have minimal or no filtering inside them, once they get the contracts, they strip them down, eliminate filters and add jumpers to them. Win wrote: > I worked for weeks to get the RFI out of my computer. It was coming > from within a commerical RFI protected case. I had S-9 plus readings > on 40 and 80 meters. When I finally turned my attention to AC power > cord and filtered it, levels dropped into the normal band noise. > > win w0lz Article: 94242 of rec.radio.amateur.homebrew From: Roy Lewallen Subject: Re: The Perfect Ham Store? Date: Sun, 28 Aug 2005 00:39:56 -0700 Message-ID: <11h2qif115ukic7@corp.supernews.com> References: <1125008389.118793.289820@g14g2000cwa.googlegroups.com> <1125081915.412415.325230@g44g2000cwa.googlegroups.com> <2s2dnZ2dnZ24ZZfxnZ2dnVgGkt6dnZ2dRVnyqZ2dnZ0@pipex.net> <430FEFAC.2070008@invalid.invalid> <1125125215.194247.199450@g43g2000cwa.googlegroups.com> <1125199947.326228.201120@g49g2000cwa.googlegroups.com> eternalsquire@comcast.net wrote: > Because unless I know different from an authoritative source, US > Customs pretty much considers anything much above a transistor to be > military dual-use tech in the post 9/11 era. Take a look at the Ebay > ads these days... you'll hardly ever see a US Ebay willing to sell > outside CONUS due to export hassles. >. . . Hm, that's interesting. I just put a customs declaration on the package like I always have, and haven't had any extra problems since 9/11. I'll bet a lot of people avoid exporting because of the large number of recipients who beg them to falsify the customs tag to minimize the value or declare it as a gift. It seems that people don't want to pay the high taxes they've imposed on themselves via their nominally democratic governments. Don't hear much complaining about accepting the social services those taxes pay for, though. Roy Lewallen, W7EL Article: 94243 of rec.radio.amateur.homebrew From: "William E. Sabin" References: <1125182339.576304.12270@g43g2000cwa.googlegroups.com> Subject: Re: Homebrew radio Message-ID: Date: Sun, 28 Aug 2005 09:07:42 GMT Thanks for the info. I'll keep it in mind. My miniature bench vise can hold the glass steady. My Sony has a built-in zoom feature that works pretty well. The auto-focus works OK, but works better with a little background light. The savings in film and developing costs is a true breakthrough for an amateur casual photographer like me who needs to do everything at least a dozen times and likes to see the immediate results. Bill W0IYH, Life Member IEEE wrote in message news:1125182339.576304.12270@g43g2000cwa.googlegroups.com... > From: "William E. Sabin" on Fri 26 Aug 2005 14:09 > >>I have a new Sony digital camera 7.2 megapixel that I have been slowly >>learning how to use. I shoot pix using a tripod and max megapixel (20 >>megabytes), then I use a program that creates an optimum JPEG file that >>QRZ.com prefers that is a little less than 500 kilobytes. I use an >>external >>diffused flash that works quite well, attached to the Sony. I can shoot a >>dozen pix and delete all but the one I want (at no cost for film and >>developing). > > Having controlled my "megapixel jealousy," let me suggest a very > easy field-expedient extreme close-up adapter: An ordinary large > magnifying glass. :-) > > With an LCD screen now the optical viewfinder replacement on > cameras, a magnifying glass held in front of the lens can be > positioned easily for focus, even with the auto-focus varieties. > It can get in there very close for detail shots of the ever- > shrinking size of modern electronic components. I've used a 4" > diameter office type of magnifier glass with great successs on > close-ups using a Panasonic auto-focus digital camera, > magnifier held in the hand. > > LenAnderson@ieee.org > Article: 94244 of rec.radio.amateur.homebrew From: microwaves@blueyonder.co.uk (Peter) Subject: Re: A Weekly F.A.Q. - What Is Ham Radio? Message-ID: <4311950b.407019803@news.blueyonder.co.uk> References: <1125082573.078138.29130@g47g2000cwa.googlegroups.com> <430f71f9$0$97132$ed2619ec@ptn-nntp-reader03.plus.net> Date: Sun, 28 Aug 2005 10:43:55 GMT On Fri, 26 Aug 2005 20:46:53 +0100, "..." <..@..> wrote: >why is amateur radio not a hobby ? > >Definition of a hobby > >A spare-time recreational pursuit Sadly, for many it's a way of life... takes over from family, kids, work etc... hardly a hobby then! Article: 94245 of rec.radio.amateur.homebrew From: "Bill Sohl" References: <1125082573.078138.29130@g47g2000cwa.googlegroups.com> <430f71f9$0$97132$ed2619ec@ptn-nntp-reader03.plus.net> <4311950b.407019803@news.blueyonder.co.uk> Subject: Re: A Weekly F.A.Q. - What Is Ham Radio? Message-ID: <_SgQe.3101$_84.2648@newsread1.news.atl.earthlink.net> Date: Sun, 28 Aug 2005 11:04:26 GMT "Peter" wrote in message news:4311950b.407019803@news.blueyonder.co.uk... > On Fri, 26 Aug 2005 20:46:53 +0100, "..." <..@..> wrote: > >>why is amateur radio not a hobby ? >> >>Definition of a hobby >> >>A spare-time recreational pursuit > > Sadly, for many it's a way of life... takes over from family, kids, > work etc... hardly a hobby then! That's true for every hobby or recreational sport. There's always a minority of enthusiasts (hams, golfers, you name it) that are extremists. Cheers, Bill S. Article: 94246 of rec.radio.amateur.homebrew From: "Mr Fed UP" References: <1125008389.118793.289820@g14g2000cwa.googlegroups.com> <1125081915.412415.325230@g44g2000cwa.googlegroups.com> <2s2dnZ2dnZ24ZZfxnZ2dnVgGkt6dnZ2dRVnyqZ2dnZ0@pipex.net> Subject: Re: The Perfect Ham Store? Message-ID: Date: Sun, 28 Aug 2005 10:42:40 -0500 Well while adding to my check-it-out in my spare time sites..... www.jabdog.co.uk came up empty. Any of the letters in error? I wouldn't have a guess as to a search for your site listed Thanks K4TWO Gary "Highland Ham" wrote in message news:2s2dnZ2dnZ24ZZfxnZ2dnVgGkt6dnZ2dRVnyqZ2dnZ0@pipex.net... >> There is also the possibility that we could import discretes and other >> parts directly from small shops in India and China. >> >> The only problem is that it seems that US Customs import duties for >> electronics coming in from Japan are rather punitive to small-time >> operators. Maybe I am wrong. >> >> Maybe you and I should go into this one together :) > ==================================== > In Britain there are few 1 man or family companies selling components. > Have a look at > www.modecomponents.co.uk > www.jabdog.co.uk > www.sycomcomp.co.uk > > In western european countries there are a number of traders selling > surplus components incl RF parts ,who move from fleamarket to fleamarket > ,from country to country. A number buy surplus army kit from eastern > europe and sell these as components...........................they have > done that for many years ,hence must have a reasonable income from these > activities . > I have seen a web site related to the sale (auction) of US Government > equipment (located in Virginia) with some mouthwatering electronic > (test)equipment . There should be a market for this equipment ,even as > components. > > The marketing question remains : Is there a substantial ham homebrew > market in the USA . How many of the approx 700000 licenced Hams in the USA > purchase electronic components on a more or less regular basis ? > > Surplus people in the USA like 'Surplus of Nebraska ' and 'Peter Dahl' > seem rather expensive. > > Frank GMØCSZ / KN6WH. > > > > Article: 94247 of rec.radio.amateur.homebrew Message-ID: <4312EF51.2D49A24@earthlink.net> From: "Michael A. Terrell" Subject: Re: The Perfect Ham Store? References: <1125008389.118793.289820@g14g2000cwa.googlegroups.com> Date: Mon, 29 Aug 2005 11:19:31 GMT eternalsquire@comcast.net wrote: > > This is a capital idea. I can only see one little problem: what > if the parts list is spread between 3 or 4 vendors and I have to > pay $5 handling fee to each vendor? This can get pretty expensive > fairly quickly for the customer. > > The Eternal Squire I think that the idea was that you would be able to combine orders >from several people per order to each supplier to reduce the overall shipping costs. Also, buying by the standard break saves money, per unit. I have a lot of parts on hand where it was cheaper to order more than I needed because the next break was less than ordering a smaller amount. EX: $1.45 each. $12.50/10 or $100/100 and I needed 85 parts. 85 * $1.25 = $106.25 so I got 15 extra parts, and saved $6.25. I've done a lot of repair jobs over the years with parts I got for "Free" that way. -- Link to my "Computers for disabled Veterans" project website deleted after threats were telephoned to my church. Michael A. Terrell Central Florida Article: 94248 of rec.radio.amateur.homebrew From: "Bill Grimwood" References: <430ee8a5.23133834@news.xtra.co.nz> Subject: Re: Manual for MFJ-1276 TNC? Date: Mon, 29 Aug 2005 11:41:29 -0500 Message-ID: <96603$43133abe$42b8eba0$21011@EDELTACOM.COM> I had a piece of equipment that the manual was not on their website so I called them and they sent me a copy. Give them a call. Bill "Renfred" wrote in message news:430ee8a5.23133834@news.xtra.co.nz... > Anyone out there got a manual for one of these? Sure would appreciate > it if someone can dig one out or has a copy in Adobe pdf. Many thanks, > Renfred. > Remove (X) from xrenfred for correct email address...thanks. Article: 94249 of rec.radio.amateur.homebrew From: "Heytubeguy" Subject: FA:HUGE GE/Westingh. Meters,+ tubes+stuff.... Message-ID: Date: Mon, 29 Aug 2005 22:18:57 GMT Hugh GE and a Westinghouse meters; and a few tubes, and few other things too: see at: http://search.ebay.com/_W0QQfgtpZ1QQfrppZ25QQsassZheytubeguy Tnx for looking, 73 heytubeguy Article: 94250 of rec.radio.amateur.homebrew From: Nicolas Boretos Subject: Philips/Magnavox D2999 service manual, schematic needed Date: Tue, 30 Aug 2005 14:50:52 +0300 Message-ID: <1125402652.728785@athnrd02> Hi, Can anyone help out here... regards, nicolas Article: 94251 of rec.radio.amateur.homebrew From: "Jeff" Subject: NE602 Primer article? Message-ID: Date: Wed, 31 Aug 2005 08:18:35 +1200 Has anyone seen a Web copy of the article "NE602 Primer"- by Carr featured in Elektor Electronics Jan. '92 Im interested to get the article. Ive looked at the Elektor site, but their back issues dont go back that far. regards, JEFF ZL3JK New Zealand jeff_164@NOSPAMhotmail.com (remove the NOSPAM) Article: 94252 of rec.radio.amateur.homebrew From: "Richard W. Solomon, W1KSZ" Subject: APRS Question Message-ID: Date: Tue, 30 Aug 2005 21:19:21 GMT Can anyone tell me if I can use a Kantronics KAM on APRS ? Tnx, Dick, W1KSZ Article: 94253 of rec.radio.amateur.homebrew From: Tim Wescott Subject: Re: phase angle and impedance of resonant circuits Date: Tue, 30 Aug 2005 15:51:03 -0700 Message-ID: <11h9omdp0ns6196@corp.supernews.com> References: <1125441521.799326.31340@f14g2000cwb.googlegroups.com> eternalsquire@comcast.net wrote: > All, > > I'm an Advanced studying for my Extra, and so far I am getting 66% on > the practice exams without even studying after about 3 years of > homebrewing. I need a few extra points to make it over the top, and > since I am a builder (of sorts) I would like to do it using the > electrical principles part of the exam. > > However, the questions pool provides the answers but not how to get > them. I'd rather be able to understand how to arrive at it without a > calculator. > > Problem class 1: impedance and phase angle of RLC parallel circuit > where component values and frequency are known. > > Problem class 2: impedance and phase angle of RLC series circuit where > > component values and frequency are known. > > Could I calculate these graphically using tip-to-tail summation of > impedance vectors? > >>From what I understand, |Z| = 2 pi F L, |Z| = 2 pi / (F C), |Z| = R > But how can I get the phase angle or the conjugate pair so that I can > do the vector addition? > > Thanks in advance, > > The Eternal Squire > I was going to ask what study materials you're using -- but you're not, are you? IIRC this is discussed in the ARRL handbook, which you should have if you're homebrewing. You calculate the series circuit impedance by adding the impedances of the parts, which you can do graphically, or by adding all of the real parts and all of the imaginary parts. You must calculate the parallel circuit impedance as 1/(the circuit admittance), the latter being the sum of the admittances of all the parts. -- Tim Wescott Wescott Design Services http://www.wescottdesign.com Article: 94254 of rec.radio.amateur.homebrew From: Roy Lewallen Subject: Re: phase angle and impedance of resonant circuits Date: Tue, 30 Aug 2005 16:59:05 -0700 Message-ID: <11h9smd2nk4gvf2@corp.supernews.com> References: <1125441521.799326.31340@f14g2000cwb.googlegroups.com> eternalsquire@comcast.net wrote: > All, > > I'm an Advanced studying for my Extra, and so far I am getting 66% on > the practice exams without even studying after about 3 years of > homebrewing. I need a few extra points to make it over the top, and > since I am a builder (of sorts) I would like to do it using the > electrical principles part of the exam. > > However, the questions pool provides the answers but not how to get > them. I'd rather be able to understand how to arrive at it without a > calculator. > > Problem class 1: impedance and phase angle of RLC parallel circuit > where component values and frequency are known. Set up axes with R being the horizontal axis and X the vertical axis. To enter a value of R of, say, three ohms, begin at the origin and draw a vector that points to the right, 3 units long. To add a reactance to that, draw a vector from the tip of the R vector, but going up or down -- inductive reactance goes up, capacitive reactance down, with length equal to the amount of reactance. [XL = 2 * pi * f * L, XC = 1/(2 * pi * f * C)] You can add any number of Rs and Xs this way. When you're done, draw a vector from the origin to the tip of the last vector. Its length is the magnitude of the total impedance and the angle it makes with the real (R) axis is the phase angle. In terms of R and X, the horizontal distance from the origin to the tip of the last vector is the resistance of the total impedance, and the vertical distance is the X. What you've been doing is adding impedances in series, so that's appropriate for figuring the total impedance of a series RLC circuit. To work with parallel circuits, do the same thing but with conductance and susceptance rather than resistance and reactance. The horizontal axis is conductance (1/R) and the vertical axis is susceptance (1/X). Vectors representing conductance point to the right; inductive susceptance points down and capacitive susceptance points up. When you get finished, the distance from the origin to the tip of the last vector is the magnitude of the admittance (1/|Z|) and the angle from the real axis is the angle of the admittance. This is the negative of the angle of the impedance. This is hard to explain without diagrams, but I'm sure there are lots of good graphical explanations available in handbooks and on the web. Roy Lewallen, W7EL > > Problem class 2: impedance and phase angle of RLC series circuit where > > component values and frequency are known. > > Could I calculate these graphically using tip-to-tail summation of > impedance vectors? > >>From what I understand, |Z| = 2 pi F L, |Z| = 2 pi / (F C), |Z| = R > But how can I get the phase angle or the conjugate pair so that I can > do the vector addition? > > Thanks in advance, > > The Eternal Squire > Article: 94255 of rec.radio.amateur.homebrew From: Roy Lewallen Subject: Re: phase angle and impedance of resonant circuits Date: Wed, 31 Aug 2005 00:23:09 -0700 Message-ID: <11hamn1p14c0cdb@corp.supernews.com> References: <1125441521.799326.31340@f14g2000cwb.googlegroups.com> <11h9smd2nk4gvf2@corp.supernews.com> <1125462438.841216.185990@f14g2000cwb.googlegroups.com> eternalsquire@comcast.net wrote: > "When you get finished, > the distance from the origin to the tip of the last vector is the > magnitude of the admittance (1/|Z|) and the angle from the real axis is > the angle of the admittance. This is the negative of the angle of the > impedance." > > Do you mean that the angle the admittance is in the opposite quadrant > of the impedance? If the angle of the admittance is 20 degrees, the angle of the impedance is -20 degrees. Draw a set of axes. Draw a vector at an angle of 20 degrees from the real (horizontal) axis (20 degrees counterclockwise >from the axis). Now draw another vector at an angle of -20 degrees from that axis (20 degrees clockwise from the axis). Are they in opposite quadrants? Roy Lewallen, W7EL Article: 94256 of rec.radio.amateur.homebrew From: Roy Lewallen Subject: Re: phase angle and impedance of resonant circuits Date: Wed, 31 Aug 2005 01:22:45 -0700 Message-ID: <11haq6pluumpvdc@corp.supernews.com> References: <1125441521.799326.31340@f14g2000cwb.googlegroups.com> <11h9smd2nk4gvf2@corp.supernews.com> <1125473546.791826.289710@o13g2000cwo.googlegroups.com> <1125473918.294745.212200@f14g2000cwb.googlegroups.com> eternalsquire@comcast.net wrote: > Oops, one other thing I forgot to mention: > > Q = XL / XR > > The Eternal Squire Two problems. 1. It's XL / R. There's no such thing as XR, in this context anyway. 2. Q = XL / R only when the R and L are in series. The Q of a parallel R-L is R / XL. You can remember those by using a little thought. The Q of an inductor is highest if it has zero series resistance or if it has infinite shunt resistance. Conversely, if you put a very large resistor in series with an inductor, you won't be able to distinguish the circuit from just the resistor. So the Q will be very low. In the parallel case, a low value of resistor will make the inductor become insignificant, trashing the Q. Good luck with your exam! Roy Lewallen, W7EL Article: 94257 of rec.radio.amateur.homebrew From: Nicolas Boretos Subject: Re: Philips/Magnavox D2999 service manual, schematic needed Date: Wed, 31 Aug 2005 15:50:55 +0300 Message-ID: <1125492655.792526@athnrd02> References: <1125402652.728785@athnrd02> Joe McElvenney wrote: > Hi, > > On Tue, 30 Aug 2005 14:50:52 +0300, Nicolas Boretos > wrote: > > >>Hi, >> >>Can anyone help out here... >> >>regards, >>nicolas > > > I have a PDF file of the user manual for the Philips D2999 > containing the schematics. It is just under 2MB. Let me know if it > is of any use to you. It is just under 2MB. > > > Cheers - Joe (G3LLV) Thanx alot Joe, could sure use it... regards, nikos Article: 94258 of rec.radio.amateur.homebrew From: Nicolas Boretos Subject: Philps/Magnavox D2999 help needed Date: Wed, 31 Aug 2005 16:18:20 +0300 Message-ID: <1125494300.955139@athnrd02> Hi, I wonder if I could tap into some collective insight here while waiting for a manual and schem, (thanx Joe), here's where I'm at with the radio... 1. The machine comes on, I get a display, all leds for frequency bands are on, Iguess that only FM, default, or the last band selected should be on) half of them dimmer than the other half. Can repeatedly turn radio off and on if no other function/button is selected. If I push a button of two, I can neither turn the machine off, nor select any other bands, have to unplug... 2. When the machine sits a bit, off (power plug attached) It comes on, and now I am even able to tune a bit w/ the encoder, and even key in a frequency, and it changes, and plays a bit, then dies...Letting it sit a couple of minutes, it can be switched back on, and tunes and plays a bit more, starts to growl...and then the sound stops, its stuck and I turn it off.. While I'm not even a mediocre tech, it sounds like a cap is initially empty, charges, then starts to leak...IIRC, a power supply cap, or drop in ps voltage might be might explain the growl..... Maybe the same in the 5v supply? Or should I freeze spray the thing??? The radio uses, AFAIS, among others, M5840 cpu MM5481 led driver? MM5368 oscillator TDA1571 mixer TDA5700 radio chip Anyway, would really appreciate some help.... regards, nikos