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341. [Amps] Re: BTI (score: 1)
Author: R.Measures <r@somis.org>
Date: Sun, 1 Feb 2004 07:11:05 -0800
** The principles for adding 160m to an 80m - 10m amplifier are outlined in: http://www.somis.org/add.160m.html - Unless the bandswitch is toasted from parasitic-arcing, there is no reason to make a
/archives//html/Amps/2004-02/msg00003.html (7,397 bytes)

342. Re: [Amps] Re: Amps Digest, Vol 13, Issue 52 (score: 1)
Author: R.Measures <r@somis.org>
Date: Sun, 1 Feb 2004 07:23:35 -0800
** John -- A friend who worked in the broadcast industry told me that tetrodes with handles (such as the 8281) emit blue-light from their ceramic anode insulator. This phenomenon is apparently due t
/archives//html/Amps/2004-02/msg00004.html (8,691 bytes)

343. Re: [Amps] Re: matching network (score: 1)
Author: R.Measures <r@somis.org>
Date: Sun, 1 Feb 2004 07:25:50 -0800
** Ian -- The sticky wicket is that there are no characteristic curves for 0V on the screen. _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contes
/archives//html/Amps/2004-02/msg00005.html (7,795 bytes)

344. Re: [Amps] Re: matching network (score: 1)
Author: R.Measures <r@somis.org>
Date: Tue, 3 Feb 2004 03:48:47 -0800
** Indeed. ... getting back to g-g operation for a tube with a max. g1 rating of 2mA, I would not try it. Even with a stripe-cathode and aligned grid, typical grid currents are c. 100mA in g-g triod
/archives//html/Amps/2004-02/msg00023.html (8,579 bytes)

345. Re: [Amps] 4cx800a/gu74b anode clips (score: 1)
Author: R.Measures <r@somis.org>
Date: Tue, 3 Feb 2004 03:48:58 -0800
** For anode-contactors, I use CF500 long finger stock fastened to the chimney. It reduces lead L and it facilitates changing tubes. Drawing thereof: http://www.somis.org/D.a.11.GIF _________________
/archives//html/Amps/2004-02/msg00024.html (35,253 bytes)

346. Re: [Amps] Problems with a gu-84b amp (score: 1)
Author: R.Measures <r@somis.org>
Date: Wed, 4 Feb 2004 01:18:34 -0800
It's hard to say unless one does one's homework. I would start by measuring the resistance of the suppressor-R. If it's more than 50% high, I would be suspicious. High-potting the tube at 2x the rat
/archives//html/Amps/2004-02/msg00029.html (7,865 bytes)

347. Re: [Amps] Re: matching network (score: 1)
Author: R.Measures <r@somis.org>
Date: Wed, 4 Feb 2004 08:20:49 -0800
** Ian -- Is the power gain with cathode-driven and no g1 current the same as with 'super-cathode' drive -- i.e., c. 5? - If g1 is never to be driven more positive than the cathode potential, why no
/archives//html/Amps/2004-02/msg00031.html (8,907 bytes)

348. Re: [Amps] 4cx800a/gu74b anode clips (score: 1)
Author: R.Measures <r@somis.org>
Date: Wed, 4 Feb 2004 08:20:49 -0800
** Two flathead 4-40 machine screws with locknuts fasten through the holes shown in Figure 11 to corresponding holes in the fibreglass chimney. The locknuts face away from the anode. _______________
/archives//html/Amps/2004-02/msg00032.html (7,795 bytes)

349. Re: [Amps] Re: matching network (score: 1)
Author: R.Measures <r@somis.org>
Date: Thu, 5 Feb 2004 05:07:01 -0800
** Ian -- I too once thought this was the case, but a friend proved it is not by experimenting with a 4-1000A tetrode amplifier. The reason the power gain is not: "considerably higher, and is in the
/archives//html/Amps/2004-02/msg00035.html (11,530 bytes)

350. Re: [Amps] Re: matching network (score: 1)
Author: R.Measures <r@somis.org>
Date: Thu, 5 Feb 2004 12:40:45 -0800
** Super-cathode drive means g1 is tied to the cathode, the screen/g2/ is at RF-ground, and the cathode is driven. Typical power gain is roughly = to the g1-g2 amplification factor -- i.e., which is
/archives//html/Amps/2004-02/msg00039.html (8,386 bytes)

351. Re: [Amps] MagCap Engineering ? (score: 1)
Author: R.Measures <r@somis.org>
Date: Tue, 10 Feb 2004 10:18:15 -0800
** The bottom-line with Hipersil&reg; transformers is winding resistance, not advertised ratings. _______________________________________________ Amps mailing list Amps@contesting.com http://lists.c
/archives//html/Amps/2004-02/msg00067.html (8,732 bytes)

352. Re: [Amps] 9913 cable (score: 1)
Author: R.Measures <r@somis.org>
Date: Tue, 10 Feb 2004 10:18:14 -0800
** Off center fed dipoles need to be fed with ladder-line and a Balanced L-network tuner. If I were building such, I would use #12 bare Cu spaced c. 4" for the feedline, - cheers, Ken. ______________
/archives//html/Amps/2004-02/msg00068.html (8,125 bytes)

353. Re: [Amps] AL-811 additional cooling fan? (score: 1)
Author: R.Measures <r@somis.org>
Date: Wed, 11 Feb 2004 03:09:27 -0800
** The 6.3v filament winding feeding a FWD will make a bit over 12vdc. _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listin
/archives//html/Amps/2004-02/msg00076.html (7,482 bytes)

354. Re: [Amps] A CALL TO ARMS ! (score: 1)
Author: R.Measures <r@somis.org>
Date: Fri, 13 Feb 2004 02:47:59 -0800
What puzzles me is how does one put 2MHz digital info back and forth through numerous 60Hz transformers? A DSL-telephone line is a whole nuther ballgame since it is basically a balanced transmission
/archives//html/Amps/2004-02/msg00095.html (11,096 bytes)

355. Re: [Amps] A CALL TO ARMS ! (score: 1)
Author: R.Measures <r@somis.org>
Date: Fri, 13 Feb 2004 14:24:06 -0800
** Bypassing millions of transformers sounds more expensive than DSL-telephone service. _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.c
/archives//html/Amps/2004-02/msg00103.html (11,550 bytes)

356. Re: [Amps] 4CX800 2 Meter Linear (score: 1)
Author: R.Measures <r@somis.org>
Date: Mon, 16 Feb 2004 08:41:17 -0800
** Paralleled DC blocker caps unavoidably create a parallel-resonant circuit. I would use a dipmeter to see where this resonance happens to be parked. - I would use one capacitor for the DC blocker.
/archives//html/Amps/2004-02/msg00134.html (10,240 bytes)

357. Re: [Amps] 9913 mystery solved (score: 1)
Author: R.Measures <r@somis.org>
Date: Mon, 16 Feb 2004 08:41:17 -0800
** Also, PL-259 connectors are not ok for outdoor use since they allow rain water to enter the coax. _______________________________________________ Amps mailing list Amps@contesting.com http://list
/archives//html/Amps/2004-02/msg00135.html (7,211 bytes)

358. Re: [Amps] Dubilier Mica Cap Data Wanted (score: 1)
Author: R.Measures <r@somis.org>
Date: Mon, 16 Feb 2004 08:41:18 -0800
** Craig -- Mica capacitors need to be current-derated above 5MHz. _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/
/archives//html/Amps/2004-02/msg00136.html (7,439 bytes)

359. RE: [BULK] - [Amps] Info on Mirage 6M 10/150 Amp? (score: 1)
Author: R.Measures <r@somis.org>
Date: Tue, 17 Feb 2004 03:09:21 -0800
** What mode are you using on 6m? _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2004-02/msg00148.html (11,470 bytes)

360. Re: [BULK] - [Amps] Info on Mirage 6M 10/150 Amp? (score: 1)
Author: R.Measures <r@somis.org>
Date: Tue, 17 Feb 2004 09:38:54 -0800
** Joe -- RF controlled bias-switching works well on AM and FM. This is not the case for SSB and CW. For those two modes, transceiver-control works best. _____________________________________________
/archives//html/Amps/2004-02/msg00152.html (13,243 bytes)

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