Article: 95304 of rec.radio.amateur.homebrew From: Jim Thompson Subject: Re: Unusual functions of cheap parts Message-ID: References: <4385b3b1$1$27887$9b4e6d93@newsread4.arcor-online.net> <11oci80ha32mv77@corp.supernews.com> <4OChf.266$5Z4.11@news.edisontel.com> Date: Thu, 01 Dec 2005 08:05:55 -0700 On 30 Nov 2005 18:46:34 -0800, Winfield Hill wrote: >Winfried Salomon wrote... >> Jorgen Lund-Nielsen wrote: >>> Winfried Salomon wrote: >>> >>>> btw, do you know a standard complementary pnp-transistor for the >>>> 2N2369, such like 2N3905 but with higher ft and less feedback >>>> capacitance? It seems that the manufactorers have almost no data >>>> on their internet pages. >>> >>> Maybe 2N4261? Have not looked into the datasheet, but as i remember, >>> i have seen them sometimes in complementary with the 2N2369 > > That was a high-frequency part for the time, spec'd at 1200MHz... > >> the problem is, that it is an rf-transistor and can't be driven at >> 30V/0.2A, I found a complementary in an old table KTT, the 2N2894A, >> but it also has max. 12V, so I find no other than the 2N3906. > > An old Raytheon datasheet says the 2N2894 was doped with platinum. > [snip] Thanks for tracking that down, Win! Gold in a PNP was certainly troubling my ancient remembrance of semiconductor chemistry. ...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. Article: 95305 of rec.radio.amateur.homebrew From: mcalhoun@ksu.edu Subject: OFF TOPIC, but how do y'all read these news groups? Date: 1 Dec 2005 16:02:04 -0600 Message-ID: Note the multi-group posting. For 18 years, I've been reading newgroups on Unix (or Linux) machines, first using "rn" (readnews) and later "nn" (netnews), but now my ISP (Kansas State University) has notified me that, because their news server is getting old and because I'm one of only a very few users, they are dropping the service as of 28 December. So I need to find an alternative way of getting my daily "fix"; I sure hope someone has suggestion(s)! -- --Myron A. Calhoun. Five boxes preserve our freedoms: soap, ballot, witness, jury, and cartridge PhD EE (retired). "Barbershop" tenor. CDL(PTXS). W0PBV. (785) 539-4448 NRA Life Member and Certified Instructor (Home Firearm Safety, Rifle, Pistol) Article: 95306 of rec.radio.amateur.homebrew Date: Thu, 01 Dec 2005 18:36:05 -0400 From: Bill Subject: Re: OFF TOPIC, but how do y'all read these news groups? References: <43a463-5ld.ln1@remote.clifto.com> Message-ID: <5ff07$438f7ad6$4232bd6c$7468@COQUI.NET> clifto wrote: > mcalhoun@ksu.edu wrote: > >>So I need to find an alternative way of getting my daily "fix"; >>I sure hope someone has suggestion(s)! > > > You can buy a super duper feed from Supernews. For less money, you can > get a good feed (text only IIRC) from news.individual.net. > > Guess we're not in Kansas any more. > add teranews.com to the list Article: 95307 of rec.radio.amateur.homebrew From: "John, N9JG" References: <43a463-5ld.ln1@remote.clifto.com> <5ff07$438f7ad6$4232bd6c$7468@COQUI.NET> Subject: Re: OFF TOPIC, but how do y'all read these news groups? Message-ID: Date: Thu, 01 Dec 2005 22:40:48 GMT Check out https://www.altopia.com/ "Bill" wrote in message news:5ff07$438f7ad6$4232bd6c$7468@COQUI.NET... > clifto wrote: > >> mcalhoun@ksu.edu wrote: >> >>>So I need to find an alternative way of getting my daily "fix"; >>>I sure hope someone has suggestion(s)! >> >> >> You can buy a super duper feed from Supernews. For less money, you can >> get a good feed (text only IIRC) from news.individual.net. >> >> Guess we're not in Kansas any more. >> > add teranews.com to the list Article: 95308 of rec.radio.amateur.homebrew From: Cecil Moore Subject: Re: OFF TOPIC, but how do y'all read these news groups? References: Message-ID: Date: Thu, 01 Dec 2005 23:32:26 GMT mcalhoun@ksu.edu wrote: > So I need to find an alternative way of getting my daily "fix"; > I sure hope someone has suggestion(s)! Who's your ISP? SBCGlobal.net supplies a news-server. Google's newsgroup server is now close to real-time. Or try: > http://www.usenet-access.com/contactus.asp -- 73, Cecil http://www.qsl.net/w5dxp Article: 95309 of rec.radio.amateur.homebrew From: kludge@panix.com (Scott Dorsey) Subject: Re: OFF TOPIC, but how do y'all read these news groups? Date: 1 Dec 2005 18:42:46 -0500 Message-ID: References: In article , wrote: >For 18 years, I've been reading newgroups on Unix (or Linux) machines, >first using "rn" (readnews) and later "nn" (netnews), but now my ISP >(Kansas State University) has notified me that, because their news server >is getting old and because I'm one of only a very few users, they are >dropping the service as of 28 December. If you like using the old rn, nn, and tin servers, get a shell account >from Panix. You can telnet or ssh in from anywhere in the world, type "rn" at the shell prompt and go. And it's ten bucks a month and the tech support is better than you've ever had from Computer Services at KSU. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." Article: 95310 of rec.radio.amateur.homebrew From: Ken Scharf Subject: Re: OFF TOPIC, but how do y'all read these news groups? References: <43a463-5ld.ln1@remote.clifto.com> <5ff07$438f7ad6$4232bd6c$7468@COQUI.NET> Message-ID: <_jPjf.8429$wi2.4833@bignews1.bellsouth.net> Date: Thu, 01 Dec 2005 22:39:58 -0500 Bill wrote: > clifto wrote: > >> mcalhoun@ksu.edu wrote: >> >>> So I need to find an alternative way of getting my daily "fix"; >>> I sure hope someone has suggestion(s)! >> >> >> >> You can buy a super duper feed from Supernews. For less money, you can >> get a good feed (text only IIRC) from news.individual.net. >> >> Guess we're not in Kansas any more. >> > add teranews.com to the list teranews.com is ok, free (nominal one time setup charge) but they go up and down like a yo-yo. Article: 95311 of rec.radio.amateur.homebrew Message-ID: <438FDA4B.EE73C55B@tori.com> From: Tori Subject: Re: Toroids coating References: Date: Fri, 02 Dec 2005 05:23:25 GMT Why not email or visit amidon.com ?? tori Ivan Makarov wrote: > Hi, > does anybody know if coating on Amidon toroidal cores has any dielectric > properties, such as a particular breakdown voltage rating, or it is not > meant for electrical insulation. > > Thks Article: 95312 of rec.radio.amateur.homebrew From: "Neil Preston" Subject: Need to build 100 mW UHF power amp Message-ID: Date: Fri, 02 Dec 2005 06:27:23 GMT I want to be able to send a UHF TV signal (400-800 MHz) from one end of the house to the other. I have a UHF digital PLL modulator with an output level of 7dBmV minimum, and would like to use it to feed a small linear 100 mW "power" amp to a 1/4 wave whip. I don't think I'll find such a critter very easily, (if at all) so I would like some suggestions as to how I might find resources to build one. (Of course, a pre-designed schematic and PCB layout would be ideal!) Anyone have any suggestions as to where to start? (Besides Google... BTDT.) Neil Preston, CET Article: 95313 of rec.radio.amateur.homebrew From: "Reg Edwards" Subject: Re: Toroids coating Date: Fri, 2 Dec 2005 14:37:54 +0000 (UTC) Message-ID: References: Amidon dust-iron cores are not uniformly coated. It is just a colour-coding paint, sprayed on. Otherwise the paint may just as well not be there. Article: 95314 of rec.radio.amateur.homebrew From: Philip de Cadenet Subject: FA: Various items including some for homebrewers Date: Fri, 2 Dec 2005 15:08:53 +0000 Message-ID: Full description and photo's here> http://search.ebay.co.uk/_W0QQsassZphilsthebossQQhtZ-1 Good luck should you decide to bid. -- Philip de Cadenet G4ZOW Transmitters 'R' Us http://www.transmittersrus.com Article: 95315 of rec.radio.amateur.homebrew From: nospam@nouce.bellatlantic.net Subject: Re: Need to build 100 mW UHF power amp Message-ID: References: Date: Fri, 02 Dec 2005 16:50:46 GMT On Fri, 02 Dec 2005 06:27:23 GMT, "Neil Preston" wrote: >I want to be able to send a UHF TV signal (400-800 MHz) from one end of the >house to the other. I have a UHF digital PLL modulator with an output level >of 7dBmV minimum, and would like to use it to feed a small linear 100 mW >"power" amp to a 1/4 wave whip. > >I don't think I'll find such a critter very easily, (if at all) so I would >like some suggestions as to how I might find resources to build one. (Of >course, a pre-designed schematic and PCB layout would be ideal!) > >Anyone have any suggestions as to where to start? (Besides Google... BTDT.) > >Neil Preston, CET There are legal issues to doing that in most countries. Besides 100mw is a lot of power for maybe 100ft. You need maybe 10mw and thats a lot less of an effort. Also if you target isn't moving a corner reflector at each end will make a big difference. One last thing most TV system antennas are dipoles and horizonatlly polarized TX and RX antennas should have the same orientation. Ignore the gastly bad monopole that comes with TVs for UHF. Allison Article: 95316 of rec.radio.amateur.homebrew From: Allodoxaphobia Subject: Re: OFF TOPIC, but how do y'all read these news groups? Date: 2 Dec 2005 17:02:34 GMT Message-ID: References: On Fri, 02 Dec 2005 12:39:23 +0000, Highland Ham wrote: > You can access newsgroups via Google ,but I believe you then need a > gmail e-mail address ,which is free anyway. > > Frank GM0CSZ / KN6WH > >====================mcalhoun@ksu.edu wrote:==================== > >> Note the multi-group posting. >> >> For 18 years, I've been reading newgroups on Unix (or Linux) machines, >> first using "rn" (readnews) and later "nn" (netnews), but now my ISP >> (Kansas State University) has notified me that, because their news server >> is getting old and because I'm one of only a very few users, they are >> dropping the service as of 28 December. >> >> So I need to find an alternative way of getting my daily "fix"; >> I sure hope someone has suggestion(s)! And, using Google, you run the risk of being killfiled by a Great Many usenet denizens because of the gawd-awful defaults Google uses for follow-ups in its posting configuration. But, then, you knew that... So, you being a *nix user, I can't see you getting excited about doing usenet 'text work' with a bloated cartoon interface. I'm a *nix user, too, and I can recommend Individual.net ( http://news.individual.net/ ). It's is the follow-on/re-incarnation of the free news.cis.dfn.de. It costs 10 Euro per year and it's well worth it. I used the online sign-up and paid via the FirstgGate ( http://firstgate.com/EU/en/info.html ) service they use. Now, if only slrn could score on top-posters. sigh... HTH Jonesy -- Marvin L Jones | jonz | W3DHJ | linux Pueblo, Colorado | @ | Jonesy | OS/2 __ 38.24N 104.55W | config.com | DM78rf | SK Article: 95317 of rec.radio.amateur.homebrew From: "Steve Reinhardt" Subject: Re: For sale Date: Fri, 2 Dec 2005 12:22:35 -0500 Message-ID: References: For what it's worth, I just bought a TR-3, RV-3 and AC-3 from David. Came pretty much as advertised, and described to me on emails. One satisfied customer is a very small sample, but I think his appraisal of his equipment had less seller inflation than I've seen on ebay. Your mileage may vary, of course... Steve AB1EN "wb5cys" wrote in message news:Q0qjf.34583$6e1.2483@newssvr14.news.prodigy.com... > How can you expect someone to make an offer on a piece of equipment they > have never seen? All we have to go on is your description. You see the > equipment, you know it's condition, you know how it performs, you know what > you will take for it - why not just say? Or are you hoping for the > proverbial sucker? > > > "David J Windisch" wrote in message > news:g_Dhf.233897$lI5.95863@tornado.ohiordc.rr.com... > > Hi, all concerned: > > > > For sale: > > > > 1. 80-10M Drake L-4B amplifier, sn 1010, Eimac tubes, pwr supply sn 1000, > > book, in good condition electrically; cosmetically, a few scuffs around > > the front edges. No issues with it; I simply got an amp with 160M. If > > you pick it up, I could demonstrate its 600W out on c-w and 1100W out on > > ssb. 10-day money-back warranty, provided it comes back in the same > > condition it leaves. > > > > 2. Meissner Signal Shifter exciter in good working and physical > > condition; 3.4-30 MHz, copy of book. I got it to drive a homebrew 4-400 > > to a KW on c-w, but that's not going to happen. > > > > 3. ESS TIME MACHINE: complete info at: > > http://www.expandedspectrumsystems.com/prod2.html > > I have band-filters and 9 different crystals for 40-30-20-15-10M, FLX-90, > > LO1 external-lo buffer, wall wart, all manuals. Got this for > > experimenting with homebrew software-defined-radio, also not going to > > happen. > > > > 4. Original service manual for Kenwood TS850SAT. Sold rigs; buyers didn't > > want it. > > > > 5. Before-MFJ HyGain TH7DX broadband tri-band antenna, good condition, > > original book. > > > > 6. Cushcraft 402CD pre-XM240 2-element 40M yagi, good condition, with CC > > 40M rotatable dipole I got to make 3L yagi out of 2L. > > > > 7. TMC IPA r-f deck, uses PL-172/8295A (no tube; same *socket* as 8877; > > chimney could have 4-inch OD-3-1/2orso-ID machined hi-temp non-conductive > > ring sitting on 8877 to cover over difference in tube diameters), 750pF > > Tune/1000pF vac variables with turns-counters in 2-30MHz bandswitched > > tank which has 3/8-in silver-plated conductors, 2 multi-meters, 6CL6/6146 > > bandswitched driver, no power supplies. > > > > Pls make offers, and remember shipping from 45251. Antennas can be > > disassembled far enough to fit in those concrete-form tubes, for shipping. > > You know; those ones you've seen in bigboxhardware :o) > > > > Tks for reading. > > > > 73, Dave, N3HE > > Cincinnati, OH > > 513-674-7202 > > > > > > Article: 95318 of rec.radio.amateur.homebrew From: "Peckham Spring" References: <1133554612.696150.28320@g44g2000cwa.googlegroups.com> Subject: Re: FAQ - Important because of the CBers on the RSC Council Message-ID: Date: Fri, 02 Dec 2005 21:20:25 GMT "Pierian Spring" wrote in message news:1133554612.696150.28320@g44g2000cwa.googlegroups.com... > What is Ham Radio? > You really are a 44 carat plonker! Article: 95319 of rec.radio.amateur.homebrew From: "Neil Preston" References: Subject: Re: Need to build 100 mW UHF power amp Message-ID: Date: Fri, 02 Dec 2005 21:27:35 GMT Hi, All; Thanks for the responses so far. The intent is to produce a device that will operate within the limits of Part 15 of FCC rules for unlicensed radiators. Somewhere in the back of my mind the 100 mW figure floated to the top, probably as a result of the old 100 mW unlicensed CB walkie-talkies we used to play with as kids. It is probable in this case that a 10 mW output to a corner reflector at the transmitter site will suffice. The target is a standard residential TV receiving antenna connected to a household distribution system. The received signal needs to be large enough to drive a number of splitters and lengths of coax. This would allow us to view the image on any TV in the house. The exciter is specified to produce a 7 dBmV output into a 75 ohm load, which I calculate to be about 2.2 mV or 67 nW. I don't believe this is enough to drive even a corner reflector to cover the distance we need. (It's barely enough to give a clean signal on the TV by direct coax connection!) We have tried using a 2.4 GHz system, but we have several nearby WiFi systems here that it interferes with. We want to get completely away from the 2.4GHz range. My initial plan is to use UHF channel 14. Thanks for the pointer to MiniCircuits. I've seen ads, but hadn't thought of them. I'll look into them. Following are excerpts from FCC Part 15 regs (http://wireless.fcc.gov/rules.html) that I think would apply. Note that the allowable field strength is the same for both unintentional and intentional radiators in the frequency range of interest. Subpart B_Unintentional Radiators Sec. 15.109 Radiated emission limits. (a) Except for Class A digital devices, the field strength of radiated emissions from unintentional radiators at a distance of 3 meters shall not exceed the following values: [[Page 774]] ------------------------------------------------------------------------ Field strength Frequency of emission (MHz) (microvolts/ meter) ------------------------------------------------------------------------ 30-88..................................................... 100 88-216.................................................... 150 216-960................................................... 200 Above 960................................................. 500 ------------------------------------------------------------------------ Subpart C_Intentional Radiators Sec. 15.209 Radiated emission limits; general requirements. (a) Except as provided elsewhere in this subpart, the emissions from an intentional radiator shall not exceed the field strength levels specified in the following table: ------------------------------------------------------------------------ Measurement Frequency (MHz) Field strength distance (microvolts/meter) (meters) ------------------------------------------------------------------------ 0.009-0.490...................... 2400/F(kHz) 300 0.490-1.705...................... 24000/F(kHz) 30 1.705-30.0....................... 30 30 30-88............................ 100 ** 3 88-216........................... 150 ** 3 216-960.......................... 200 ** 3 Above 960........................ 500 3 ------------------------------------------------------------------------ ** Except as provided in paragraph (g), fundamental emissions from intentional radiators operating under this section shall not be located in the frequency bands 54-72 MHz, 76-88 MHz, 174-216 MHz or 470-806 MHz. However, operation within these frequency bands is permItted under other sections of this part, e.g., Sec. Sec. 15.231 and 15.241. Sec. 15.23 Home-built devices. (a) Equipment authorization is not required for devices that are not marketed, are not constructed from a kit, and are built in quantities of five or less for personal use. (b) It is recognized that the individual builder of home-built equipment may not possess the means to perform the measurements for determining compliance with the regulations. In this case, the builder is expected to employ good engineering practices to meet the specified technical standards to the greatest extent practicable. The provisions of Sec. 15.5 apply to this equipment. Article: 95320 of rec.radio.amateur.homebrew From: "offspring" References: <1133554612.696150.28320@g44g2000cwa.googlegroups.com> <1133559667.420521.112050@f14g2000cwb.googlegroups.com> Subject: Re: FAQ - Important because of the CBers on the RSC Council Message-ID: Date: Fri, 02 Dec 2005 21:52:19 GMT "Pierian Spring" wrote in message news:1133559667.420521.112050@f14g2000cwb.googlegroups.com... Are you back on the dole again, Gareth? offspring Article: 95321 of rec.radio.amateur.homebrew From: "G1LVN \(for it is he\)" Subject: Re: FAQ - Important because of the CBers on the RSC Council Date: Fri, 2 Dec 2005 22:12:24 +0000 (UTC) Message-ID: References: <1133554612.696150.28320@g44g2000cwa.googlegroups.com> <1133559667.420521.112050@f14g2000cwb.googlegroups.com> "offspring" wrote in message news:nm3kf.22325$uR.5095@newsfe7-gui.ntli.net... > > "Pierian Spring" wrote in message > news:1133559667.420521.112050@f14g2000cwb.googlegroups.com... > > Are you back on the dole again, Gareth? > > offspring No I'm cleaning windows actually....... -- -- 73deG1LVN(M0WWS) Xmas Lights de G1LVN QTH: http://www.g1lvn.org.uk/xmas Article: 95322 of rec.radio.amateur.homebrew From: "main spring" References: <1133554612.696150.28320@g44g2000cwa.googlegroups.com> <1133559667.420521.112050@f14g2000cwb.googlegroups.com> <1133560970.403341.143270@g43g2000cwa.googlegroups.com> Subject: Re: FAQ - Important because of the CBers on the RSC Council Message-ID: Date: Fri, 02 Dec 2005 22:13:50 GMT "Pierian Spring" wrote in message news:1133560970.403341.143270@g43g2000cwa.googlegroups.com... > "Usually such people are a > variation of the CB Radio hobbyist; ..... > they are free with rather silly personal insults;" > > You really should take the time to read some of your own postings! Main Spring Article: 95323 of rec.radio.amateur.homebrew From: "G1LVN \(for it is he\)" Subject: Re: FAQ - Important because of the CBers on the RSC Council Date: Fri, 2 Dec 2005 22:29:14 +0000 (UTC) Message-ID: References: <1133554612.696150.28320@g44g2000cwa.googlegroups.com> <1133559667.420521.112050@f14g2000cwb.googlegroups.com> "G1LVN (for it is he)" wrote in message news:dmqgs8$nh$1@nwrdmz02.dmz.ncs.ea.ibs-infra.bt.com... > > "offspring" wrote in message > news:nm3kf.22325$uR.5095@newsfe7-gui.ntli.net... >> >> "Pierian Spring" wrote in message >> news:1133559667.420521.112050@f14g2000cwb.googlegroups.com... >> >> Are you back on the dole again, Gareth? >> >> offspring > No I'm cleaning windows actually....... -- -- 73deG1LVN(M0WWS) Xmas Lights de G1LVN QTH: http://www.g1lvn.org.uk/xmas Article: 95324 of rec.radio.amateur.homebrew From: Conrad Poos Subject: Re: FAQ - Important because of the CBers on the RSC Council References: <1133554612.696150.28320@g44g2000cwa.googlegroups.com> Message-ID: Date: Fri, 02 Dec 2005 22:35:26 GMT Pierian Spring wrote: > Thus a Radio Ham > could also hold a CB licence safe in the knowledge that > such a licence says no more about him than having a land-line > telephone, whilst continuing to regard Ham Radio as a separate > technical pursuit. Ever since you were 'outed' as a CBer, you've been engaged in this damage limitation exercise which, to be quite honest, smacks of effort. Nobody really gives a toss whether you own a CB-set or not...its your 'holier than thou' attitude which people find 'old'. However, at least I *can* criticise you without fear of having my door smashed down by the police and being arrested for intimidating you. You can also be sure that, should you criticise me, which you are equally entitled to do, I will take it on the chin like a decent chap and not get all stroppy about it at the local lodge. 10-10, high and low numbers, etc etc ;) Poos -- vy 73 de Conrad Poos "Ich bin ein radio amateur" Article: 95325 of rec.radio.amateur.homebrew From: "MattD.." Subject: Re: FAQ - Important because of the CBers on the RSC Council Date: Fri, 02 Dec 2005 22:49:33 +0000 Message-ID: References: <1133554612.696150.28320@g44g2000cwa.googlegroups.com> After replacing Conrad Poos with a small shell script on Friday 02 Dec 2005 22:35, the following appeared on stdout: > However, at least I can criticise you without fear of having my door > smashed down by the police and being arrested for intimidating you. You > can also be sure that, should you criticise me, which you are equally > entitled to do, I will take it on the chin like a decent chap and not > get all stroppy about it at the local lodge. Spoken like a gent, Poos. You're probably Jim's hero tonight. -- Seasonal radio wishes #13 To be able to say "Christmas radio wishes" again without some half-wit taking offence at the simple terminology that has served this country well for centuries. Article: 95326 of rec.radio.amateur.homebrew From: Roy Lewallen Subject: Re: Toroids coating Date: Fri, 02 Dec 2005 16:20:23 -0800 Message-ID: <11p1p6blgqmrf9c@corp.supernews.com> References: <1133565896.523456.69990@g14g2000cwa.googlegroups.com> LenAnderson@ieee.org wrote: > > Since Bill Amidon sold his business to another company, the "new" > Amidon company has been reselling another company's toroidal core > forms. > . . . I didn't know that anyone else but Micrometals made powdered iron cores suitable for RF. Amidon never manufactured their own cores. They used to carry Micrometals powdered iron and Fair-Rite ferrite cores, with a few other ferrite cores from Magnetics and other manufacturers. Whose cores are they selling now? Roy Lewallen, W7EL Article: 95327 of rec.radio.amateur.homebrew From: "Neil Preston" References: <2OqdnYH89tImfQ3e4p2dnA@bright.net> Subject: Re: Need to build 100 mW UHF power amp Message-ID: Date: Sat, 03 Dec 2005 00:52:27 GMT 2.4 GHz is the problem. That frequency is too congested at this location. I need to move the signal OUT of the 2.4 GHz band. "Scott" wrote in message news:2OqdnYH89tImfQ3e4p2dnA@bright.net... > http://www.jameco.com/ sells video transmitters for 2.4 GHz. If you > have composite video available, it would be easier and legal to go this > route. > > Scott > > > Neil Preston wrote: > > > I want to be able to send a UHF TV signal (400-800 MHz) from one end of the > > house to the other. I have a UHF digital PLL modulator with an output level > > of 7dBmV minimum, and would like to use it to feed a small linear 100 mW > > "power" amp to a 1/4 wave whip. > > > > I don't think I'll find such a critter very easily, (if at all) so I would > > like some suggestions as to how I might find resources to build one. (Of > > course, a pre-designed schematic and PCB layout would be ideal!) > > > > Anyone have any suggestions as to where to start? (Besides Google... BTDT.) > > > > Neil Preston, CET > > > > > > > > Article: 95328 of rec.radio.amateur.homebrew Message-ID: <43910B3C.4000905@worldnet.att.net> From: Al Schapira Subject: FS: HP Function Generators: (2) HP 3310A (1) HP 3311A Date: Sat, 03 Dec 2005 03:03:44 GMT The following equipment is offered for sale. Each is used, but in working condition, with a complete *original* operating and service manual and power cord. Shipping to a US address is *included*. Thanks for looking. -Al Schapira, KC2HRH, a.d.schapira@worldnet.att.net =========================================================== HP 3310A Function Generator #1 (S/N #1151A08983) Sine/square/triangle/ramp/pulse 0.0005 Hz to 5 Mhz, and external VCO input. Working perfectly. Minor nicks and scrapes on the top of the case from being stacked. About 7 lbs. $75.00. See http://home.att.net/~a.schapira/pix/HP/HP-3310A_1.jpg http://home.att.net/~a.schapira/pix/HP/HP-3310A_manual.jpg HP 3310A Function Generator #2 (S/N # 1151A08978) Sine/square/triangle/ramp/pulse 0.0005 Hz to 5 Mhz, and external VCO input. Working perfectly. Minor nicks and scrapes on the top of the case from being stacked. Pilot lamp assembly has been replaced with round red led. About 7 lbs. $65.00. See http://home.att.net/~a.schapira/pix/HP/HP-3310A_2.jpg http://home.att.net/~a.schapira/pix/HP/HP-3310A_manual.jpg HP 3311A Function Generator (S/N #1244A29453) Sine/square/triangle to 0.1 Hz to 1 Mhz, and external VCO input. Working perfectly. About 4 lbs, $75.00. See http://home.att.net/~a.schapira/pix/HP/HP-3311A.jpg http://home.att.net/~a.schapira/pix/HP/HP-3311A_manual.jpg Article: 95329 of rec.radio.amateur.homebrew Date: Sat, 03 Dec 2005 00:01:34 -0400 From: Bill Subject: Re: voltage drop of a old silenium rectifier References: <1133579953.133312.236200@z14g2000cwz.googlegroups.com> Message-ID: tucker@conninc.com wrote: > I want to build a hi current 12v supply, I know where i can buy a > 6-12v 100amp battery > charger cheap. This charger had silenium (dont know the proper > spelling) rectifiers. Im > thinking the transformer must be alot higher voltage than a similar one > in a modern charger > using silicon diodes. If i know the drop than i can figure the > transformers output voltage. > So does anyone know the voltage drop of these old rectifiers? > Typically about 0.9v per section...when new. -Bill Article: 95330 of rec.radio.amateur.homebrew From: Roy Lewallen Subject: Re: Toroids coating Date: Sat, 03 Dec 2005 01:48:34 -0800 Message-ID: <11p2qfme1dd7a2d@corp.supernews.com> References: <1133565896.523456.69990@g14g2000cwa.googlegroups.com> <11p1p6blgqmrf9c@corp.supernews.com> <1133594993.819290.238220@g43g2000cwa.googlegroups.com> LenAnderson@ieee.org wrote: > From: Roy Lewallen on Fri, Dec 2 2005 4:20 pm > > >>LenAnderson@ieee.org wrote: > > >>> Since Bill Amidon sold his business to another company, the "new" >>> Amidon company has been reselling another company's toroidal core >>> forms. >>>. . . >> >>I didn't know that anyone else but Micrometals made powdered iron cores >>suitable for RF. > > > I have a few left-over Arnold Magnetics powdered-iron toroidal > cores that were used by RCA Corporation back in the 70s. For > the high end of HF for maximum Q. > . . . A look at Arnold Magnetics' current catalog doesn't show anything suitable for HF or above(*). Do you know of any company other than Micrometals that currently sells powdered iron cores suitable for HF? I'd guess that while low frequency powdered irons are still pretty widely used in power supplies, the market for RF powdered iron cores must be relatively small. (*) That is, materials having low loss at HF and therefore suitable for use as cores for inductors in tuned or relatively high-Q circuits. Like ferrites, powdered irons having high loss at HF can be very useful as broadband transformer cores, chokes, and in EMI suppression. Roy Lewallen, W7EL Article: 95331 of rec.radio.amateur.homebrew From: Spike Subject: Re: FAQ - Important because of the CBers on the RSC Council Date: Sat, 03 Dec 2005 10:36:54 +0000 Message-ID: References: <1133554612.696150.28320@g44g2000cwa.googlegroups.com> <1133602232.836372.26270@g47g2000cwa.googlegroups.com> Mr W Z Boson wrote: >Pierian Spring wrote: > > > > >A little Learning is a dang'rous Thing; >Drink deep, or taste not the Pierian Spring. > Alexander Pope The only thing I think we have on here that's relevant is a spring full of crocodile tears. I can remember someone on here who went 'screaming' to 'the plods' when someone wrote a letter to a family member; who made a complaint to a university vice-chancellor because an employee sent an e-mail three minutes after the end of his working day (and so must have written it in 'works time'); and who approached someone's head teacher regarding his appearance on here. Doubtless there were other incidents. He also referred to people who belonged to a tear-or-wrist organisation as 'noble'. It seems that what was good enough for him is not too good for anyone else. Perhaps his latest sock-puppet is a reference to the time he dropped a ball by saying that a spring-dashpot system was a mechanical analogue of a coil-capacitor system, because they both exhibit 'resonance'. from Aero Spike Blair: "(Saddam's) weapons of mass destruction programme is active, detailed and growing. The policy of containment is not working. The weapons of mass destruction programme is not shut down. It is up and running....The intelligence picture.....is extensive, detailed and authoritative." Article: 95332 of rec.radio.amateur.homebrew From: "Henry Kiefer" References: Subject: Re: OFF TOPIC, but how do y'all read these news groups? Date: Sat, 3 Dec 2005 12:25:41 +0100 Message-ID: <439182de$0$20842$9b4e6d93@newsread2.arcor-online.net> I used news.cis.dfn.de a while but changed to arcor-news later because of the now charging at news.cis.dfn.de Arcor is still free and fast, no reliable problems. You must have a Arcor login but this is even a free mail-account. If you like I can you send instructions where. I don't know it just if the head. Maybe they filter not-german clients out via your IP-address. But why not give it a try? Sent via Arcor - Henry > So, you being a *nix user, I can't see you getting excited about doing > usenet 'text work' with a bloated cartoon interface. I'm a *nix user, > too, and I can recommend Individual.net ( http://news.individual.net/ ). > It's is the follow-on/re-incarnation of the free news.cis.dfn.de. It > costs 10 Euro per year and it's well worth it. I used the online sign-up > and paid via the FirstgGate ( http://firstgate.com/EU/en/info.html ) > service they use. > > Now, if only slrn could score on top-posters. sigh... > > HTH > Jonesy > -- > Marvin L Jones | jonz | W3DHJ | linux > Pueblo, Colorado | @ | Jonesy | OS/2 __ > 38.24N 104.55W | config.com | DM78rf | SK Article: 95333 of rec.radio.amateur.homebrew From: Spike Subject: Re: FAQ - Important because of the CBers on the RSC Council Date: Sat, 03 Dec 2005 14:16:25 +0000 Message-ID: References: <1133554612.696150.28320@g44g2000cwa.googlegroups.com> <1133602232.836372.26270@g47g2000cwa.googlegroups.com> <1133607905.315599.28980@g14g2000cwa.googlegroups.com> Mr W Z Boson wrote: >Spike wrote: > >> Mr W Z Boson wrote: >> >> >Pierian Spring wrote: >> > >> > >> > >> > >> >A little Learning is a dang'rous Thing; >> >Drink deep, or taste not the Pierian Spring. >> > Alexander Pope >> >> The only thing I think we have on here that's relevant is a spring >> full of crocodile tears. >> >> I can remember someone on here who went 'screaming' to 'the plods' >> when someone wrote a letter to a family member; who made a complaint >> to a university vice-chancellor because an employee sent an e-mail >> three minutes after the end of his working day (and so must have >> written it in 'works time'); and who approached someone's head teacher >> regarding his appearance on here. Doubtless there were other >> incidents. He also referred to people who belonged to a tear-or-wrist >> organisation as 'noble'. It seems that what was good enough for him is >> not too good for anyone else. >> >> Perhaps his latest sock-puppet is a reference to the time he dropped a >> ball by saying that a spring-dashpot system was a mechanical analogue >> of a coil-capacitor system, because they both exhibit 'resonance'. > >I think I was commenting on the arrogance seemingly displayed by the >choice of name. Last weekend he appeared on the models.engineering group as "Very Sharp Tool". Not in this toolbox! >Despite having thrown off my ball and chain, I retain some old contacts >- I emailed one recently (a guy who has a research interest in >psychopathology) and directed him to this NG with particular reference >to certain topics. > >His response was "... interesting" I don't doubt it! Someone might take up a study of the ng for a PhD thesis - except that some on here would claim in error that the Literature Search is plagiarism of other people's work. from Aero Spike Blair: "(Saddam's) weapons of mass destruction programme is active, detailed and growing. The policy of containment is not working. The weapons of mass destruction programme is not shut down. It is up and running....The intelligence picture.....is extensive, detailed and authoritative." Article: 95334 of rec.radio.amateur.homebrew From: Al Subject: Re: OFF TOPIC, but how do y'all read these news groups? References: <439182de$0$20842$9b4e6d93@newsread2.arcor-online.net> Message-ID: Date: Sat, 03 Dec 2005 16:58:23 GMT In article <439182de$0$20842$9b4e6d93@newsread2.arcor-online.net>, "Henry Kiefer" wrote: > I used news.cis.dfn.de a while but changed to arcor-news later because of > the now charging at news.cis.dfn.de > Arcor is still free and fast, no reliable problems. You must have a Arcor > login but this is even a free mail-account. If you like I can you send > instructions where. I don't know it just if the head. > Maybe they filter not-german clients out via your IP-address. But why not > give it a try? > > Sent via Arcor - > Henry > > > > So, you being a *nix user, I can't see you getting excited about doing > > usenet 'text work' with a bloated cartoon interface. I'm a *nix user, > > too, and I can recommend Individual.net ( http://news.individual.net/ ). > > It's is the follow-on/re-incarnation of the free news.cis.dfn.de. It > > costs 10 Euro per year and it's well worth it. I used the online sign-up > > and paid via the FirstgGate ( http://firstgate.com/EU/en/info.html ) > > service they use. > > > > Now, if only slrn could score on top-posters. sigh... > > > > HTH > > Jonesy > > -- > > Marvin L Jones | jonz | W3DHJ | linux > > Pueblo, Colorado | @ | Jonesy | OS/2 __ > > 38.24N 104.55W | config.com | DM78rf | SK > > I have used the Google newsgroups on occasion. All you need is a browser. I don't care for the interface though. Al Article: 95335 of rec.radio.amateur.homebrew From: Paul Burridge Subject: Short coax interconnections - phase implications?? Date: Sat, 03 Dec 2005 17:19:29 +0100 Message-ID: <1bh3p11kcftnc9rtrhfihqc7r2olhe2oqj@4ax.com> Hello guys, I recently picked up an old vector network analyser in working order but minus the 3 interconnects between it and the transmission/reflection bridge. These are specified in the manual to be exactly 24" long, 50 ohms and terminated by N-type plugs. I've been told the length of these patch leads is quite critical to getting accurate measurements with this VNA, but am at a loss to work out why 24" is specified when the frequency range of this device is 4Mhz to 1300Mhz. If it were only capable of measuring at one fixed frequency, I could understand the need for a specifically cut length of some fraction of a wavelength. Can anyone explain the relevance of 24" in this context? Also, will *any* 50 ohm coax suffice for this purpose or has it got to be something special? Thanks, P. -- "What is now proved was once only imagin'd" - William Blake Article: 95336 of rec.radio.amateur.homebrew From: "Alan Holmes" References: <1133554612.696150.28320@g44g2000cwa.googlegroups.com> Subject: Re: FAQ - Important because of the CBers on the RSC Council Message-ID: Date: Sat, 03 Dec 2005 18:32:02 GMT "Peckham Spring" wrote in message news:tU2kf.8119$LO4.329@newsfe5-gui.ntli.net... > > "Pierian Spring" wrote in message > news:1133554612.696150.28320@g44g2000cwa.googlegroups.com... >> What is Ham Radio? >> > > You really are a 44 carat plonker! And you aren't? > > Article: 95337 of rec.radio.amateur.homebrew From: "tox" References: <1133554612.696150.28320@g44g2000cwa.googlegroups.com> <1133635062.575476.31830@g47g2000cwa.googlegroups.com> Subject: Re: FAQ - Important because of the CBers on the RSC Council Message-ID: Date: Sat, 03 Dec 2005 18:49:07 GMT "Pierian Spring" wrote in message news:1133635062.575476.31830@g47g2000cwa.googlegroups.com... > "Poxic Waste" is one of life's failures who cannot even pass > the exams set for 6-year-olds, but somehow fools himself > into thinking that he is accepted widely by the fraternity of > Radio Hams, but the reality is that it is only CBers-Masquerading-As > -Radio-Hams who consort with him in this NG; Childish > Broadcasters (CBers) to a man. All of the 6-year-olds who have passed the M3 exam, know how to post correctly. HTH tox (who can hold down a job) Article: 95338 of rec.radio.amateur.homebrew From: Spike Subject: Re: FAQ - Important because of the CBers on the RSC Council Date: Sat, 03 Dec 2005 19:00:59 +0000 Message-ID: <9hq3p1dqrj3i8j3hahh583jjd8hhjoi5b2@4ax.com> References: <1133554612.696150.28320@g44g2000cwa.googlegroups.com> <1133635062.575476.31830@g47g2000cwa.googlegroups.com> tox wrote: > >"Pierian Spring of Crocodile Tears" wrote > >> "Poxic Waste" is one of life's failures..... > >All of the 6-year-olds who have passed the M3 exam, know how to post >correctly. > >HTH >tox (who can hold down a job) Remind me again, tox, who was it that was arrested earlier this year? from Aero Spike Blair: "(Saddam's) weapons of mass destruction programme is active, detailed and growing. The policy of containment is not working. The weapons of mass destruction programme is not shut down. It is up and running....The intelligence picture.....is extensive, detailed and authoritative." Article: 95339 of rec.radio.amateur.homebrew From: "Henry Kiefer" References: <439182de$0$20842$9b4e6d93@newsread2.arcor-online.net> Subject: Re: OFF TOPIC, but how do y'all read these news groups? Date: Sat, 3 Dec 2005 20:22:09 +0100 Message-ID: <4391f3de$0$20858$9b4e6d93@newsread2.arcor-online.net> Google interface is nice but overloaded. I prefer to offline action what is not possible with Google. - Henry "Al" schrieb im Newsbeitrag news:no.spam-FAB984.11582403122005@news.verizon.net... > In article <439182de$0$20842$9b4e6d93@newsread2.arcor-online.net>, > "Henry Kiefer" wrote: > > > I used news.cis.dfn.de a while but changed to arcor-news later because of > > the now charging at news.cis.dfn.de > > Arcor is still free and fast, no reliable problems. You must have a Arcor > > login but this is even a free mail-account. If you like I can you send > > instructions where. I don't know it just if the head. > > Maybe they filter not-german clients out via your IP-address. But why not > > give it a try? > > > > Sent via Arcor - > > Henry > > > > > > > So, you being a *nix user, I can't see you getting excited about doing > > > usenet 'text work' with a bloated cartoon interface. I'm a *nix user, > > > too, and I can recommend Individual.net ( http://news.individual.net/ ). > > > It's is the follow-on/re-incarnation of the free news.cis.dfn.de. It > > > costs 10 Euro per year and it's well worth it. I used the online sign-up > > > and paid via the FirstgGate ( http://firstgate.com/EU/en/info.html ) > > > service they use. > > > > > > Now, if only slrn could score on top-posters. sigh... > > > > > > HTH > > > Jonesy > > > -- > > > Marvin L Jones | jonz | W3DHJ | linux > > > Pueblo, Colorado | @ | Jonesy | OS/2 __ > > > 38.24N 104.55W | config.com | DM78rf | SK > > > > > > I have used the Google newsgroups on occasion. All you need is a > browser. I don't care for the interface though. > > Al Article: 95340 of rec.radio.amateur.homebrew From: "tox" References: <1133554612.696150.28320@g44g2000cwa.googlegroups.com> <1133635062.575476.31830@g47g2000cwa.googlegroups.com> <9hq3p1dqrj3i8j3hahh583jjd8hhjoi5b2@4ax.com> Subject: Re: FAQ - Important because of the CBers on the RSC Council Message-ID: Date: Sat, 03 Dec 2005 19:42:04 GMT "Spike" wrote in message news:9hq3p1dqrj3i8j3hahh583jjd8hhjoi5b2@4ax.com... > > tox wrote: > >> >>"Pierian Spring of Crocodile Tears" wrote >> > > Remind me again, tox, who was it that was arrested earlier this year? > > Indeed Spike. Words such as "memory" and "selective", springs to mind here! tox Article: 95341 of rec.radio.amateur.homebrew Message-ID: <43921F26.7040309@worldnet.att.net> From: Al Schapira Subject: FS: Bud equipment cabinets/enclosures, unused Date: Sat, 03 Dec 2005 22:40:58 GMT The cabinets below are *unused* and in near perfect condition, NOS. Shipping to a US address is *included*. (Check a distributor for retail prices or specs.) Thanks for looking. -Al Schapira, KC2HRH, a.d.schapira@worldnet.att.net =========================================================== Bud Equipment Enclosure, WA-1541, aluminum, 9 x 8.12 x 12, 3.5 lbs, metalic gray hammertone finish, reinforced flexible recessed metal handle. Very minor pits in handle bracket. Includes finished front panel. Includes, rubber feet and screws. Unused. $35. See http://home.att.net/~a.schapira/pix/Cabinets/Bud-WA-1541_1.jpg http://home.att.net/~a.schapira/pix/Cabinets/Bud-WA-1541_2.jpg http://home.att.net/~a.schapira/pix/Cabinets/Bud-WA-1541_3.jpg Bud Equipment Enclosure, WA-1540, aluminum, 8 x 6.12 x 8, 2 lbs, metalic gray hammertone finish, reinforced flexible recessed metal handle. Includes, rubber feet and screws. *Has no front panel*. Unused. $25. See http://home.att.net/~a.schapira/pix/Cabinets/Bud-WA-1540_1.jpg http://home.att.net/~a.schapira/pix/Cabinets/Bud-WA-1540_2.jpg Article: 95342 of rec.radio.amateur.homebrew Subject: Herbal Nutrition From: "Shauna" Date: Sat, 03 Dec 2005 18:05:21 Message-ID: <1133651230_62175@spool6-east.superfeed.net> Hey there! Have you tried a diet that maybe didn't work? OR! Maybe It did start to work, but you had a decrease in energy or you didn't get down to wear you want to be.Most people don't understand you can't lose weight if you boycott certain things that your body needs for its daily routine! Herbal-Nutrition promotes weight loss that is healthy and fast! Usually when most dieters start their diets, they stop taking in nutrients that your body NEEDS to make its daily cycles. A lot of materials that are taken in, Paralyze your body's cells, they need to move!!! Start a diet today that can increase your energy and metabolism. Recieve all your necessary nutrients and lose the weight that you want in one month! We have just what you need! Heck, start losing weight the right way, today! http://www.herbal-nutrition.net/shaunaandrews --- MAF Anti-Spam ID: 20051202111138E9v9SzW9 ----== Posted via Newsfeeds.Com - Unlimited-Unrestricted-Secure Usenet News==---- http://www.newsfeeds.com The #1 Newsgroup Service in the World! >100,000 Newsgroups ---= East/West-Coast Server Farms - Total Privacy via Encryption =--- Article: 95343 of rec.radio.amateur.homebrew From: "Graeme Zimmer" Subject: Circuit for Telemobile TRX ? Message-ID: <1133660010.b1c70aa749fa91d2db13a367a5a9346b@fe5.teranews.com> Date: Sun, 04 Dec 2005 01:33:30 +0000 Hi folks, I have a Telemobile radio which is labeled "FCC I.D. D4T9MP725" (I cant find any reference on the FCC web data base) Looking at the PCB it apears to be: 6 channel, 25 Watt, FM, VHF high band. It uses a 2SC1946A PA and a 2SC2237 driver. The IF is a MC3357 I'd like to convert it to 2 Mtrs, but first I need a circuit diagram. Can anybody help please? Would be happy to pay any reasonable costs. Tks ................. Zim ................... VK3GJZ Article: 95344 of rec.radio.amateur.homebrew From: novatech@eskimo.com (Steven Swift) Subject: Re: Simple triggered sweep. Date: 4 Dec 2005 16:52:26 GMT Message-ID: References: I posted a schematic and theory of operation of an improved version of my attempt at this. It triggers nicely to about 1MHz with the parts as shown. http://www.novatech-instr.com/Fun/trig.pdf Thanks for all the feedback. Steve. -- 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 Article: 95345 of rec.radio.amateur.homebrew From: "AG4QC" Subject: Ground resistance tester Message-ID: Date: Sun, 4 Dec 2005 14:43:47 -0600 I was wondering if anyone built some sort of ground resistance tester? I read that the NEC requires 25 Ohms or less.. But I don't understand how to measure that. I certainly could use a ohm meter between a ground rod and the test subject, but then the ground rod I use as a reference could be faulty.. It seems to me it must be measured in some other manner. Maybe low frequency signal and then measure how much it's absorbed in the earth?.. I know they sell a clamp on ground resistance tester for big bucks. Considering it's a clamp on, it certainly don't have any external reference.. Anyway, I was wondering if anyone had any experience with these testers and maybe building one? Joe AG4QC Article: 95346 of rec.radio.amateur.homebrew From: Roy Lewallen Subject: Re: Ground resistance tester Date: Sun, 04 Dec 2005 16:49:24 -0800 Message-ID: <11p73krhkuoqib9@corp.supernews.com> References: Ground resistance varies considerably with frequency, and at HF it can be very different from the DC or 60 Hz value. (For example, pure water is virtually lossless at DC and low frequency, but very lossy at HF.) And in order to get a decent representation of ground, you also have to know its dielectric constant. The only reasonably accurate method I know of to make these measurements is a system using a buried transmission line, called an OWL tester. I've never seen or used one, just read some papers where it was used. If your need is for an NEC model, you should realize that the skin depth of current in soil in the HF range is on the order of 10 - 20 feet, meaning that significant current exists to well below this depth. Soil is seldom homogeneous, so to make an accurate representation of real soil, you'd have to test the soil at various depths down to perhaps 30 - 50 feet or so, then make up some sort of average value for the program to use. I don't believe any single average value will really be a good representation of a typical stratified ground. So the bottom line is that even if you could accurately measure the surface soil conductivity, you wouldn't have enough information for an accurate model. And in fact, even if you could measure the conductivity and dielectric constant to a great depth, the model still wouldn't be very good because of its assumption that the soil is homogeneous. About the best you can do with currently available software is to estimate the best and worst likely soil characteristics which might occur from the surface to a few tens of feet depth. Run simulations with both. The antenna performance will probably end up somewhere between the results of the two. Even that isn't guaranteed, though, since any single value probably isn't adequate to represent a stratified ground. Ground modeling is the weak point of all NEC-type programs. Don't put too much weight on results which are strongly dependent on ground characteristics. Roy Lewallen, W7EL AG4QC wrote: > I was wondering if anyone built some sort of ground resistance tester? I > read that the NEC requires 25 Ohms or less.. But I don't understand how to > measure that. I certainly could use a ohm meter between a ground rod and the > test subject, but then the ground rod I use as a reference could be faulty.. > It seems to me it must be measured in some other manner. Maybe low frequency > signal and then measure how much it's absorbed in the earth?.. I know they > sell a clamp on ground resistance tester for big bucks. Considering it's a > clamp on, it certainly don't have any external reference.. Anyway, I was > wondering if anyone had any experience with these testers and maybe building > one? > > Joe AG4QC > > Article: 95347 of rec.radio.amateur.homebrew From: "Wayne P. Muckleroy" References: <1bh3p11kcftnc9rtrhfihqc7r2olhe2oqj@4ax.com> Subject: Re: Short coax interconnections - phase implications?? Message-ID: <%JNkf.12425$lh.1687@tornado.ohiordc.rr.com> Date: Mon, 05 Dec 2005 02:37:47 GMT Did you also receive a calibration kit with the VNA? If you did so, then the lengths of these interconnect cables are not crucial for calibrated measurements. Only uncalibrated measurements will be affected. It would help to know the manufacturer and model of the VNA. Wayne (KC8UIO) "Paul Burridge" wrote in message news:1bh3p11kcftnc9rtrhfihqc7r2olhe2oqj@4ax.com... > Hello guys, > > I recently picked up an old vector network analyser in working order > but minus the 3 interconnects between it and the > transmission/reflection bridge. These are specified in the manual to > be exactly 24" long, 50 ohms and terminated by N-type plugs. > I've been told the length of these patch leads is quite critical to > getting accurate measurements with this VNA, but am at a loss to work > out why 24" is specified when the frequency range of this device is > 4Mhz to 1300Mhz. If it were only capable of measuring at one fixed > frequency, I could understand the need for a specifically cut length > of some fraction of a wavelength. > Can anyone explain the relevance of 24" in this context? > Also, will *any* 50 ohm coax suffice for this purpose or has it got to > be something special? > Thanks, > P. > -- > > "What is now proved was once only imagin'd" - William Blake Article: 95348 of rec.radio.amateur.homebrew From: nothermark Subject: Re: Ground resistance tester Message-ID: References: <11p73krhkuoqib9@corp.supernews.com> Date: Mon, 05 Dec 2005 03:06:44 GMT On Sun, 4 Dec 2005 21:11:23 -0500, "Ivan Makarov" wrote: >Apparently Joe is talking about contact resistance between a grounding rod >and the soil. Is that correct, Joe? I also saw those ground rod clamp >testers in the Inet, and is still puzzled how they claim accuracy down to >0.01 Ohm. > >Thks, >Ivan > Accuracy as in reading + or - 0.01 vs reading of 0.01 ohms absolute - very big difference in technology involved. ;-) You have to define what they are doing. Article: 95349 of rec.radio.amateur.homebrew From: "AG4QC" References: <11p73krhkuoqib9@corp.supernews.com> Subject: Re: Ground resistance tester Message-ID: Date: Sun, 4 Dec 2005 21:06:16 -0600 Well, yes that's true.. In this case I was talking about the NEC (National Electrical Code).. Sort of a basic electrical question, from a ham radio prospective. They put up a Satellite Internet dish on my roof and it was too far away from the 'Service' protective ground so it's not grounded. So I ran my own bonding ground wire to tie it into the rest of my single point grounding system. It started me wondering just how affective all these ground rods were, even though they are all bonded together. So that started me looking around for a way to measure the resistance to ground, as I figure the less the better. Of course, in this case I am talking about 'protective' ground as required in the NEC handbook. The electricians around here eyes glaze over when I ask about the 25 ohm or less requirement. So I figured maybe someone on here had experience measuring the required ground.. It would be my luck the house would take a minor lightning hit and the Insurance company would try to weasel out of there responsibilities by saying the ground didn't meet the NEC requirements not to mention I rather not have issues. While unlikely, I hear all sorts of horror stories on how they are trying to disallow claims for all sorts of reasons after Katrina. Joe AG4QC "Ivan Makarov" wrote in message news:YcWdnWUOpY4hPA7eRVn-uQ@rogers.com... > Apparently Joe is talking about contact resistance between a grounding rod > and the soil. Is that correct, Joe? I also saw those ground rod clamp > testers in the Inet, and is still puzzled how they claim accuracy down to > 0.01 Ohm. > > Thks, > Ivan > > Article: 95350 of rec.radio.amateur.homebrew From: "Mario Bros" Subject: MESA Quartz Crystals Date: Mon, 5 Dec 2005 13:14:43 +0100 Message-ID: <43942f33$0$16208$4fafbaef@reader3.news.tin.it> Hi folks, I have acquired of the MESA Quartz Crystals to approximately 160 Mhz fundamental AT. Someone knows some circuit for their use? 73's de IK6GQC Rocco Article: 95351 of rec.radio.amateur.homebrew From: "William E. Sabin" References: Subject: Re: Ground resistance tester Message-ID: Date: Mon, 05 Dec 2005 14:00:51 GMT If a 60 Hz measurement is the only physical test that is available, that is better than nothing. The experts say that is useless, but I do not agree 100%. Once upon a time I used a 12.6 V 60 Hz transformer and an AC ammeter to measure the current between some ham radio ground rods and the building utility ground and then calculated a resistance value of about 16 ohms. The substantial current flow helped to overcome an initial high value of resistance. The ground path did not seem to be perfectly linear at very low current values. What the 2 to 30 MHz values were I have no idea. A high power (100 W ) HF signal and an RF ammeter would have been a better approach. This test has to be carefully designed to reduce HF impedance effects. The best approach, I believe, is to use an antenna design that does not utilize a ground path return impedance. In a balanced system the return current is through a transmission line, not the earth. A multi-wire ground plane with a transmission line return path is also a good approach that is very often used. Common-mode currents that try to return on the outside of the transmission line must be attenuated using a current balun. Bill W0IYH "AG4QC" wrote in message news:dyIkf.4473$lh.123001@news.sisna.com... >I was wondering if anyone built some sort of ground resistance tester? I >read that the NEC requires 25 Ohms or less.. But I don't understand how to >measure that. I certainly could use a ohm meter between a ground rod and >the test subject, but then the ground rod I use as a reference could be >faulty.. It seems to me it must be measured in some other manner. Maybe low >frequency signal and then measure how much it's absorbed in the earth?.. I >know they sell a clamp on ground resistance tester for big bucks. >Considering it's a clamp on, it certainly don't have any external >reference.. Anyway, I was wondering if anyone had any experience with these >testers and maybe building one? > > Joe AG4QC > Article: 95352 of rec.radio.amateur.homebrew From: John Ferrell Subject: Re: Ground resistance tester Message-ID: References: <11p73krhkuoqib9@corp.supernews.com> Date: Mon, 05 Dec 2005 15:21:12 GMT It sounds to me like you are looking for legal advice, not technical advice. With that in mind, and a lot of bad experience with lightning, I take the attitude that the NEC establishes the minimums for protection. After all, what can an extra ground hurt? Last summer I had lightning rods installed on my house. I live on a low ridge and have taken several (expensive) hits over the last few years. They installed ground rods on two corners of the house and tied one of them to the service ground. They also tied the Antenna tower to the opposite ground rod. I added another ground (#6 wire) from the Cable TV ground rod to the service ground. I also tied the Cable TV ground to the ground rod on the invisible fence (dog containment) with #6 wire. With all of that I still don't have a good RF ground. I hope to put up a vertical antenna soon and the first thing I need to do is establish a system of radials. Of course, the first wire will be a #6 to the service ground. BTW, I don't understand "too far away from the service ground to be connected." John Ferrell W8CCW On Sun, 4 Dec 2005 21:06:16 -0600, "AG4QC" wrote: >Well, yes that's true.. In this case I was talking about the NEC (National >Electrical Code).. Sort of a basic electrical question, from a ham radio >prospective. They put up a Satellite Internet dish on my roof and it was >too far away from the 'Service' protective ground so it's not grounded. So I >ran my own bonding ground wire to tie it into the rest of my single point >grounding system. It started me wondering just how affective all these >ground rods were, even though they are all bonded together. So that started >me looking around for a way to measure the resistance to ground, as I figure >the less the better. Of course, in this case I am talking about 'protective' >ground as required in the NEC handbook. The electricians around here eyes >glaze over when I ask about the 25 ohm or less requirement. > >So I figured maybe someone on here had experience measuring the required >ground.. It would be my luck the house would take a minor lightning hit and >the Insurance company would try to weasel out of there responsibilities by >saying the ground didn't meet the NEC requirements not to mention I rather >not have issues. While unlikely, I hear all sorts of horror stories on how >they are trying to disallow claims for all sorts of reasons after Katrina. > >Joe AG4QC > >"Ivan Makarov" wrote in message >news:YcWdnWUOpY4hPA7eRVn-uQ@rogers.com... >> Apparently Joe is talking about contact resistance between a grounding rod >> and the soil. Is that correct, Joe? I also saw those ground rod clamp >> testers in the Inet, and is still puzzled how they claim accuracy down to >> 0.01 Ohm. >> >> Thks, >> Ivan >> >> > John Ferrell W8CCW Article: 95353 of rec.radio.amateur.homebrew From: Bill Janssen Subject: Re: Ground resistance tester References: Message-ID: <_8_kf.442$OU3.330@news01.roc.ny> Date: Mon, 05 Dec 2005 16:45:46 GMT AG4QC wrote: >I was wondering if anyone built some sort of ground resistance tester? I >read that the NEC requires 25 Ohms or less.. But I don't understand how to >measure that. I certainly could use a ohm meter between a ground rod and the >test subject, but then the ground rod I use as a reference could be faulty.. >It seems to me it must be measured in some other manner. Maybe low frequency >signal and then measure how much it's absorbed in the earth?.. I know they >sell a clamp on ground resistance tester for big bucks. Considering it's a >clamp on, it certainly don't have any external reference.. Anyway, I was >wondering if anyone had any experience with these testers and maybe building >one? > >Joe AG4QC > > > > I think others have touched on the key requirement of testing at least three grounds rods. Then >from the three (or more) readings you can determine each resistance value. As others have pointed out you probably need a high current to mask the other currents in the soil. Cheers. Bill K7NOM Article: 95354 of rec.radio.amateur.homebrew From: Andy Cowley Subject: Re: "Standard parts" for rf amps? Message-ID: References: <438262c8$0$27904$9b4e6d93@newsread4.arcor-online.net> <11o4q89q7708kcd@corp.supernews.com> <11o5jngnvqrqmcb@corp.supernews.com> Date: Mon, 5 Dec 2005 16:43:57 GMT RST Engineering wrote: > Well, just for starters, what does Spice say about a 1000 pf capacitor with > either ½" lead lengths or a total of 1" of PCB trace at 150 MHz.? > It's an inductor? ;-) No such thing as a capacitor, or an inductor or resistor for that matter. They all have to be modelled as networks with L C and R don't they? vy 73 Andy, M1EBV Article: 95355 of rec.radio.amateur.homebrew From: Andy Cowley Subject: Re: "Standard parts" for rf amps? Message-ID: 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> Date: Mon, 5 Dec 2005 16:49:20 GMT Henry Kiefer wrote: > To come back to your question: Spice will give you better results than your > real circuit! Worked much DX with Spice, have you? IMHO if the results from spice differ from the real results then spice is wrong. BTW have you got a realistic model for the self-capacitance of an inductor? Can you predict the self resonance within 5%? vy 73 Andy, M1EBV Article: 95356 of rec.radio.amateur.homebrew From: Andy Cowley Subject: Re: "Standard parts" for rf amps? Message-ID: References: <438262c8$0$27904$9b4e6d93@newsread4.arcor-online.net> <11o4q89q7708kcd@corp.supernews.com> <11o5jngnvqrqmcb@corp.supernews.com> <11o82iimo8iv1d6@corp.supernews.com> Date: Mon, 5 Dec 2005 17:14:15 GMT RST Engineering (jw) wrote: > Agreed, John, 150 MHz is damned near DC for a lot of us, but as yet I have > no answer from the "spice" folks for the 1 nf capacitor question. A lot of > fancydancing but no answers. > Try them on a toroidal inductor, even at HF. I have good reason to believe they won't have anything like a model to predict self capacitance/resonance. vy 73 Andy, M1EBV Article: 95357 of rec.radio.amateur.homebrew From: Jim Thompson Subject: Re: "Standard parts" for rf amps? Message-ID: References: <438262c8$0$27904$9b4e6d93@newsread4.arcor-online.net> <11o4q89q7708kcd@corp.supernews.com> <11o5jngnvqrqmcb@corp.supernews.com> <11o82iimo8iv1d6@corp.supernews.com> Date: Mon, 05 Dec 2005 10:33:06 -0700 On Mon, 5 Dec 2005 17:14:15 GMT, Andy Cowley wrote: >RST Engineering (jw) wrote: > >> Agreed, John, 150 MHz is damned near DC for a lot of us, but as yet I have >> no answer from the "spice" folks for the 1 nf capacitor question. A lot of >> fancydancing but no answers. >> > > >Try them on a toroidal inductor, even at HF. I have good reason to >believe they won't have anything like a model to predict self >capacitance/resonance. > >vy 73 > >Andy, M1EBV Model making is driven by need. 1nF capacitors don't exist on-chip (at least not very often :), so I don't have a model. But I have built a model of a wirebond that is good up into the 3GHz range. ...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. Article: 95358 of rec.radio.amateur.homebrew From: Jim Higgins Subject: Re: Ground resistance tester Message-ID: References: <11p73krhkuoqib9@corp.supernews.com> Date: Mon, 05 Dec 2005 17:42:23 GMT On Mon, 05 Dec 2005 15:21:12 GMT, John Ferrell wrote: >It sounds to me like you are looking for legal advice, not technical >advice. > >With that in mind, and a lot of bad experience with lightning, I take >the attitude that the NEC establishes the minimums for protection. >After all, what can an extra ground hurt? > >Last summer I had lightning rods installed on my house. I live on a >low ridge and have taken several (expensive) hits over the last few >years. They installed ground rods on two corners of the house and tied >one of them to the service ground. They also tied the Antenna tower to >the opposite ground rod. I added another ground (#6 wire) from the >Cable TV ground rod to the service ground. I also tied the Cable TV >ground to the ground rod on the invisible fence (dog containment) with >#6 wire. > >With all of that I still don't have a good RF ground. I hope to put up >a vertical antenna soon and the first thing I need to do is establish >a system of radials. Of course, the first wire will be a #6 to the >service ground. > >BTW, I don't understand "too far away from the service ground to be >connected." I read it as the installers made an installation that may well have voided his home insurance policy in case of a lightening strike had he not added his own ground. This sort of thing can be a common problem with the cowboys the dish installers too often hire as subcontractors. Article: 95359 of rec.radio.amateur.homebrew From: "nobody" References: Subject: Re: Ground resistance tester Message-ID: <%6%kf.36217$6e1.7725@newssvr14.news.prodigy.com> Date: Mon, 05 Dec 2005 17:51:55 GMT Here is a good overview technical article that discussing earth grounding and how to measure it. This info is for 60Hz AC system and equipment grounding saftey and protection grounding, not antenna ground systems. Be sure to look at the pictures and figures. http://www.duncaninstr.com/Gr_article.htm Here is another useful paper. Item number 14, Ground System Testing. http://www.kilowattclassroom.com/ArchiveCatalog.htm Ronnie, N5CSE "AG4QC" wrote in message news:dyIkf.4473$lh.123001@news.sisna.com... >I was wondering if anyone built some sort of ground resistance tester? I >read that the NEC requires 25 Ohms or less.. But I don't understand how to >measure that. I certainly could use a ohm meter between a ground rod and >the test subject, but then the ground rod I use as a reference could be >faulty.. It seems to me it must be measured in some other manner. Maybe low >frequency signal and then measure how much it's absorbed in the earth?.. I >know they sell a clamp on ground resistance tester for big bucks. >Considering it's a clamp on, it certainly don't have any external >reference.. Anyway, I was wondering if anyone had any experience with these >testers and maybe building one? > > Joe AG4QC > Article: 95360 of rec.radio.amateur.homebrew From: Roy Lewallen Subject: Re: Ground resistance tester Date: Mon, 05 Dec 2005 11:32:30 -0800 Message-ID: <11p95ef7h1ti8b7@corp.supernews.com> References: Please ignore my earlier posting. I saw NEC and thought the reference was to the program of that name (Numerical Electromagnetics Code). The other responses caused me to re-read your posting more carefully and I see you're referring instead to the National Electrical Code. 60 Hz measurement is of course what you want to do, and my response was entirely inappropriate in that context. Roy Lewallen, W7EL Article: 95361 of rec.radio.amateur.homebrew From: Roy Lewallen Subject: Re: "Standard parts" for rf amps? Date: Mon, 05 Dec 2005 11:35:41 -0800 Message-ID: <11p95keq1u9frfc@corp.supernews.com> References: <438262c8$0$27904$9b4e6d93@newsread4.arcor-online.net> <11o4q89q7708kcd@corp.supernews.com> <11o5jngnvqrqmcb@corp.supernews.com> <4382ffe2$0$27884$9b4e6d93@newsread4.arcor-online.net> Andy Cowley wrote: > . . . > IMHO if the results from spice differ from the > real results then spice is wrong. > . . . If the results from SPICE differ from the real results, then your model is inadequate. Roy Lewallen, W7EL Article: 95362 of rec.radio.amateur.homebrew From: Paul Burridge Subject: Re: Short coax interconnections - phase implications?? Date: Mon, 05 Dec 2005 21:32:17 +0100 Message-ID: References: <1bh3p11kcftnc9rtrhfihqc7r2olhe2oqj@4ax.com> <%JNkf.12425$lh.1687@tornado.ohiordc.rr.com> On Mon, 05 Dec 2005 02:37:47 GMT, "Wayne P. Muckleroy" wrote: >Did you also receive a calibration kit with the VNA? Nope. > If you did so, then the >lengths of these interconnect cables are not crucial for calibrated >measurements. Only uncalibrated measurements will be affected. > >It would help to know the manufacturer and model of the VNA. It's a good old HP 8754A -- "What is now proved was once only imagin'd" - William Blake Article: 95363 of rec.radio.amateur.homebrew From: "Henry Kiefer" 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> Subject: Re: "Standard parts" for rf amps? Date: Mon, 5 Dec 2005 23:53:38 +0100 Message-ID: <4394cac3$0$9646$9b4e6d93@newsread2.arcor-online.net> Spice is as good as the input is! Spice is not a Maxwell field equations solver! You can predict within 5% without Spice?? How? - Henry "Andy Cowley" schrieb im Newsbeitrag news:Ir1Aq8.E8q@bath.ac.uk... > Henry Kiefer wrote: > > > > To come back to your question: Spice will give you better results than your > > real circuit! > > Worked much DX with Spice, have you? > > IMHO if the results from spice differ from the > real results then spice is wrong. > > BTW have you got a realistic model for the > self-capacitance of an inductor? Can you > predict the self resonance within 5%? > > > vy 73 > > Andy, M1EBV Article: 95364 of rec.radio.amateur.homebrew From: Jim Thompson Subject: Re: "Standard parts" for rf amps? Message-ID: 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> Date: Mon, 05 Dec 2005 16:34:52 -0700 On Mon, 5 Dec 2005 23:53:38 +0100, "Henry Kiefer" wrote: >Spice is as good as the input is! >Spice is not a Maxwell field equations solver! > >You can predict within 5% without Spice?? How? > >- Henry > [snip] Some of us have done better than 5% prediction BC (before CAD)... like for close to 20 years before I ever saw a computer... and 25 years before simulation software. ...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. Article: 95365 of rec.radio.amateur.homebrew From: "Mario Bros" References: <43942f33$0$16208$4fafbaef@reader3.news.tin.it> Subject: Re: MESA Quartz Crystals Date: Tue, 6 Dec 2005 09:22:30 +0100 Message-ID: <43954a45$0$7310$4fafbaef@reader4.news.tin.it> Hi Mike, thank you. I am not sure that the circuit is good also for the type of crystal that I have. That one used in this plan is a 7th while the mesa it is a fundamental AT. 73's de IK6GQC Rocco "Michael St. Angelo" ha scritto nel messaggio news:l72dnahykPCDmQjeRVn-uw@comcast.com... > Here is a low phase noise oscillator circuit for a Analog Devices AD9850 > DDS: > > http://www.analog.com/UploadedFiles/Application_Notes/377501052179934777265013367an419.pdf > > 73, > > Mike N2MS > > > > "Mario Bros" wrote in message > news:43942f33$0$16208$4fafbaef@reader3.news.tin.it... >> Hi folks, >> I have acquired of the MESA Quartz Crystals to approximately 160 Mhz >> fundamental AT. >> Someone knows some circuit for their use? >> 73's de IK6GQC Rocco >> >> > > Article: 95366 of rec.radio.amateur.homebrew From: "Henry Kiefer" 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> Subject: Re: "Standard parts" for rf amps? Date: Tue, 6 Dec 2005 13:05:41 +0100 Message-ID: <43957f44$0$9636$9b4e6d93@newsread2.arcor-online.net> Sure Jim. I understand you. That was the time where time was cheaper. Once I programmed a Gauss linear equations system solver on my Casio FX-602P - having 512 bytes and even left one byte (for extensions ;-) It was with minimal input help system (Showing the indices to input) and the matrix was of dynamical order. (Sorry for my bad english) I can buy resistors and capacitors with 5%, sometimes with 1%. If you build a rc oscillator with 1% component values, you get an error typical 1,5%. And then you add the active components with horrible semiconductor strayung values. Of course, it is possible with feedback structures to linearize and stabilize such systems. So, where is the difference between measurement of the component values and calculating by hand the circuit OR setting the measured values in the Spice component dialog boxes? The difference is the time needed and the possibility to make errors. 5% is a real good value for an analog system. Hey Jim - Why you don't answer my second private message? :-( - Henry "Jim Thompson" schrieb im Newsbeitrag news:dej9p1te7qiapphldsgvm3toip0usmeih9@4ax.com... > On Mon, 5 Dec 2005 23:53:38 +0100, "Henry Kiefer" > wrote: > > >Spice is as good as the input is! > >Spice is not a Maxwell field equations solver! > > > >You can predict within 5% without Spice?? How? > > > >- Henry > > > [snip] > > Some of us have done better than 5% prediction BC (before CAD)... like > for close to 20 years before I ever saw a computer... and 25 years > before simulation software. > > ...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. Article: 95367 of rec.radio.amateur.homebrew From: "Mario Bros" References: <43942f33$0$16208$4fafbaef@reader3.news.tin.it> <43954a45$0$7310$4fafbaef@reader4.news.tin.it> Subject: Re: MESA Quartz Crystals Date: Tue, 6 Dec 2005 21:33:07 +0100 Message-ID: <4395f57c$0$13265$4fafbaef@reader2.news.tin.it> Ok! Tim. I will try. What it interests to me is to try to use it x3 (480 Mhz) for reference DDS AD9954. Thanks "Tim Wescott" ha scritto nel messaggio news:PqSdnfr0qftRTQjeRVn-pA@web-ster.com... >A crystal running in 7th overtone mode has a narrow little resonance >surrounded by other resonances (the 9th and 5th) which must be filtered >out. > > A crystal running in fundamental mode has a pronounced resonance, with no > other significant resonances until you get to three times the operating > frequency. > > If there's anything "wrong" with that circuit it's most likely that the > frequency selective elements to keep it from jumping to 89 or 161MHz. It > may also deliver more feedback to the crystal than absolutely necessary > (dunno about that). So if anything is bad about it it's just that it has > too many components. > > It's probably a very good place to start, and should work as-is if you get > the tank tuned right. > > Mario Bros wrote: > >> Hi Mike, thank you. >> I am not sure that the circuit is good also for the type of crystal that >> I have. >> That one used in this plan is a 7th while the mesa it is a fundamental >> AT. >> >> 73's de IK6GQC Rocco >> >> "Michael St. Angelo" ha scritto nel messaggio >> news:l72dnahykPCDmQjeRVn-uw@comcast.com... >> >>>Here is a low phase noise oscillator circuit for a Analog Devices AD9850 >>>DDS: >>> >>>http://www.analog.com/UploadedFiles/Application_Notes/377501052179934777265013367an419.pdf >>> >>>73, >>> >>>Mike N2MS >>> >>> >>> >>>"Mario Bros" wrote in message >>>news:43942f33$0$16208$4fafbaef@reader3.news.tin.it... >>> >>>>Hi folks, >>>>I have acquired of the MESA Quartz Crystals to approximately 160 Mhz >>>>fundamental AT. >>>>Someone knows some circuit for their use? >>>>73's de IK6GQC Rocco >>>> >>>> >>> >>> >> >> > > > -- > > Tim Wescott > Wescott Design Services > http://www.wescottdesign.com Article: 95368 of rec.radio.amateur.homebrew From: Roy Lewallen Subject: Re: broadband transformer Date: Tue, 06 Dec 2005 13:39:40 -0800 Message-ID: <11pc18t7j7hrb98@corp.supernews.com> References: <1133885840.604319.174600@g47g2000cwa.googlegroups.com> gojamo wrote: > Can you connect a broadband rf transformer to a receiver front end tank > circuit rather than to a resistive load? Yes. The inductance of the side of > the transformer connected to the tank circuit would be several times > the inductance in the tank circuit, and changes to the overall > inductance (parallelled inductances) of the circuit would be taken > into account. You can often make a better broadband transformer by using low-frequency, high-permeability ferrite for core material than by using higher-frequency, lower-permeability ferrite. This results in a winding impedance that's high, but primarily resistive through the HF range and above. The advantages are that a high winding impedance is relatively easy to achieve, and it stays quite constant over a very wide frequency range -- typically several decades -- since it's free of resonant effects. What you have to insure, then, is that the winding impedance is at least several times higher than the impedance seen by the circuit it's across. If it is, the fact that it's resistive rather than inductive is of no consequence as far as the external circuit is concerned. Roy Lewallen, W7EL Article: 95369 of rec.radio.amateur.homebrew From: Skipp is here Subject: yahoo rfamplifiers group Date: Tue, 6 Dec 2005 23:58:53 +0000 (UTC) Message-ID: Hello there, Just a shameless plug for the Yahoo Groups... rfamplifiers group on the web. Please feel free to join us if you're interested in rf and audio amplifiers... both tube and solid state. http://groups.yahoo.com/group/rfamplifiers/ see ya' there. cheers, skipp Article: 95370 of rec.radio.amateur.homebrew From: Skipp from radiowrench dot com Subject: Re: WANTED! Mostar Intrerface Box Date: Wed, 7 Dec 2005 00:05:29 +0000 (UTC) Message-ID: References: <4sVff.5408$BC2.1398@trnddc04> <4387FCE3.90209@nettally.com> You could use one of three mostar programming options... the Epson Suitcase programmer (yuck... I hated using it), the Motorola R1800 suitcase programmer with the proper firmware installed or you'd receive the proms from motorola direct. We used to get the whisker problem all the time. A good blast of air in the rx preselector would pretty much fix it. The VCO Coil fix was a replacement retrofit coil Motorola would sell pretty cheap. Never had the problem after that... All things considered, they were pretty good radios really. If you had to play with one now... I'd probaby remove the prom and replace it with an eprom module I've seen offered for the MCX100 radio. You'd need to map the prom into the eprom map, but it wouldn't be rocket science. cheers, skipp www.radiowrench.com > **THE-RFI-EMI-GUY** wrote: : The Mostars originally used an EPSON "computer" as a programmer. The : program was on a tape drive. Very clunky. Later on the MIB programmer : was developed. I am sure you had to burn a code plug in any event. : The Mostars had a couple problems 1) The UHF ones had a problem with tin : "whiskers" growing inside the helical preselector casting which would : short out and detune the front end. It was impossible to repair this : part as it was permanently attached to the main board. 2) the 800 MHz : ones had a problem with thermal and mechanical expansion which affected : the VCO helical coil which was housed in the casting called the : "helical hotel" by the development engineer. This part you could solder : with special solder but it would soon again fail. The symptom was an : intermittent radio (no TX or RX). If you banged on it, it would start : working again for days. : Apart from these serious problems, the radios were quite an advancement : from the previous Maxar radios which used crystals and leaded : components. I believe the Mostars were the first Motorola radios to use : surface mount components and metric fastners. : SignalFerret wrote: :>If recall Mostars had a PROM on the controller board. They're programmed :>using a stand alone PROM programmer. As I recall it was a big suit case :>looking monster. :> :>May I ask, what frequency band is the Mostar, and more importantly, why :>bother. It's a Mostar. Worst Motorola radio ever! :> :>Robert N3LGC :> :>"Gene Rodgers" wrote in message :>news:4sVff.5408$BC2.1398@trnddc04... :> :> :>>I want to find a schematic for the Motorola Mostar Interface Box. I need a :>>MIB to program my Mostars. :>> :>>Thanks, :>> :>>Gene ke5bfa :>> :>> :>> :> :> :> :> : -- : Joe Leikhim K4SAT : "The RFI-EMI-GUY" : "Follow The Money" Article: 95371 of rec.radio.amateur.homebrew From: Skipp says Subject: Re: Availability of DS1689S Date: Wed, 7 Dec 2005 00:07:57 +0000 (UTC) Message-ID: References: Newark Farnell would be a place to check. I know you're in the UK, but a place in the SF Bay Area called Brill Electronics often carries that sort of stuff. Hope that helps... cheers, skipp www.radiowrench.com : Philip de Cadenet wrote: : I wonder if anyone on the brain trust knows of a possible source of this : chip? : Digikey, Mouser and Jameco in the US have been tried. Dallas/Maxim have : them on a 6 week lead time. : I need a few pieces rather urgently. : Any suggested suppliers? : -- : Philip de Cadenet G4ZOW : Transmitters 'R' Us : http://www.transmittersrus.com Article: 95372 of rec.radio.amateur.homebrew From: Skipp is a Swan and Siltronix Radio Guy Subject: Re: Need help with Swan 350 Date: Wed, 7 Dec 2005 00:15:23 +0000 (UTC) Message-ID: References: <437a53d2.1430109@newsgroups.bellsouth.net> Hi Steven, Please read the Swan and Siltronix Radio "care and feeding" information found on my Swan and Siltronix Radio web page. www.radiowrench.com/siltronix The drift fix should start off with a good cleaning and conditioning using the information I describe in the pages. Don't crack open the vfo box until you've read my information and asked a few more people for help. The radio probably hasn't run in a while... it might need new filter caps in various places. The contacts all need to be cleaned really well and restored using the proper chemicals and lubricants. The unit probably has a lot of moisture build up. When I rebuild radios... a temp cycle and moisture bake out are always part of the process. Email me through the web page or through the yahoo groups I frequent if you have more questions. You really don't need the added vfo box mods if you're patient with the proper rebuild. cheers, skipp www.radiowrench.com/sonic www.radiowrench.com/siltronix : Steven Fritts wrote: : Hello All, : I picked up a really nice working Swan 350 at a hamfest this past : weekend. I bought it for nostalgic reasons as it was the kind of rig : my dad bought for me in 1965. I need info on how to fix the infamous : "Swan drift problem". Anyone have any websites I can go to get mods : for this rig including the drift fix? : Any help will be appreciated! : Steve W4SEF