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Total 415 documents matching your query.

301. Re: [Amps] Need SB-221 tuning cap (26-164) (score: 1)
Author: Pete Smith <n4zr@contesting.com>
Date: Sun, 24 Feb 2008 10:16:05 -0500
Charlie, be careful what you wish for. Several knowledgeable people have asserted that the design change to a stouter tuning capacitor simply made the bandswitch the most likely arc location, and tha
/archives//html/Amps/2008-02/msg00169.html (8,519 bytes)

302. [Amps] QST SB-220 Article (score: 1)
Author: Pete Smith <n4zr@contesting.com>
Date: Wed, 26 Mar 2008 09:11:32 -0400
Maybe it is just the April issue, but is anyone else bothered by the article in QST on converting an SB-220 for 6 meters? I read in disbelief about all the Nichrome strap used in the amplifier. I tho
/archives//html/Amps/2008-03/msg00273.html (7,018 bytes)

303. Re: [Amps] Uneven tube glow in pair of 3-500z (score: 1)
Author: Pete Smith <n4zr@contesting.com>
Date: Fri, 09 May 2008 16:15:52 -0400
Might it be worth just swapping the two tubes side for side? If this phenomenon stays with the tube socket rather than the tube, could be it is a matter of unequal filament supply. I had something si
/archives//html/Amps/2008-05/msg00081.html (10,132 bytes)

304. Re: [Amps] Damage? (score: 1)
Author: Pete Smith <n4zr@contesting.com>
Date: Fri, 25 Jul 2008 14:15:40 -0400
Actually, this may not be as farfetched as all that - if I remember correctly, some late-model cars are now using ethernet for their data communications between the computer, various sensors, and var
/archives//html/Amps/2008-07/msg00264.html (10,522 bytes)

305. Re: [Amps] digital wattmeter (score: 1)
Author: Pete Smith <n4zr@contesting.com>
Date: Wed, 24 Sep 2008 14:13:18 -0400
It's an opinion, Anthony - specifically mine, based on the usual - reading and amateur crosstalk. I particularly like the fact that it will read R+/- J, offering the possibility of antenna analyzer-l
/archives//html/Amps/2008-09/msg00199.html (8,972 bytes)

306. Re: [Amps] SB-220 saga continues (score: 1)
Author: Pete Smith <n4zr@contesting.com>
Date: Sun, 09 Nov 2008 13:40:22 -0500
My Mark 5 has one. My SB-220, though, now has a 300-volt FET to switch the vacuum relays. 73, Pete _______________________________________________ Amps mailing list Amps@contesting.com http://lists.c
/archives//html/Amps/2008-11/msg00078.html (13,385 bytes)

307. Re: [Amps] SB-220 saga continues (score: 1)
Author: Pete Smith <n4zr@contesting.com>
Date: Sun, 09 Nov 2008 16:30:05 -0500
With the relay enabled, the specs say the Mk5 can switch up to 60 VDC at up to 200 ma, or up to 100 VDC at up to 500 ma. I *think* the TL-922 has a low VDC switching circuit, because the manual on my
/archives//html/Amps/2008-11/msg00083.html (18,034 bytes)

308. Re: [Amps] SB-220 saga continues (correction) (score: 1)
Author: Pete Smith <n4zr@contesting.com>
Date: Sun, 09 Nov 2008 16:35:44 -0500
Sorry, the second set of numbers should have been VAC. 73, Pete _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2008-11/msg00084.html (19,143 bytes)

309. Re: [Amps] SB-220 saga continues (score: 1)
Author: Pete Smith <n4zr@contesting.com>
Date: Sun, 09 Nov 2008 11:06:36 -0500
A very simple fix, which worked for years with my SB-220 and TS-930, is to insert a 220-ohm resistor in series with the kPTT lead. Does nothing for the voltage rating of the transceiver switching cir
/archives//html/Amps/2008-11/msg00090.html (12,482 bytes)

310. [Amps] Active Antenna Tuners (score: 1)
Author: Pete Smith <n4zr@contesting.com>
Date: Mon, 17 Nov 2008 08:54:31 -0500
Every phone contest, I am surprised by how well my SB-220 handles low-band antennas cut for CW, even relatively high in the SSB portions. Even with SWRs reading well over 3:1, it matches for maximum
/archives//html/Amps/2008-11/msg00170.html (6,707 bytes)

311. Re: [Amps] Linear Amps (score: 1)
Author: Pete Smith <n4zr@contesting.com>
Date: Wed, 03 Dec 2008 08:04:27 -0500
Will someone *please* change the subject line once in a while? 73, Pete N4ZR _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/
/archives//html/Amps/2008-12/msg00065.html (9,765 bytes)

312. Re: [Amps] Al811 (score: 1)
Author: Pete Smith <n4zr@contesting.com>
Date: Tue, 16 Dec 2008 08:34:25 -0500
Martin Jue is the boss of the whole MFJ shebang - MFJ = Martin F. Jue. It is now a very large business, but I remember nearly 35 years ago calling MFJ about their first product - the CWF-2 active aud
/archives//html/Amps/2008-12/msg00239.html (7,647 bytes)

313. Re: [Amps] Fwd: rx noise? (score: 1)
Author: Pete Smith <n4zr@contesting.com>
Date: Mon, 29 Dec 2008 11:09:04 -0500
Hi Dave - you and others might want to look into the small HiG d'Italia RF-switching relays that Allen Bond sells at mgs4u.com on the President's Page. They are rated 75 watts RF hot switching and I'
/archives//html/Amps/2008-12/msg00364.html (21,876 bytes)

314. [Amps] 1.5 KW Diplexer Available (score: 1)
Author: Pete Smith <n4zr@contesting.com>
Date: Wed, 14 Jan 2009 05:23:21 -0500
With the interest in the amps community in solid state legal-limit amps, I thought http://wb6dhw.com/KWDiplexer.html might be of interest. Dave has designed an output filter that seems like it's just
/archives//html/Amps/2009-01/msg00115.html (6,551 bytes)

315. Re: [Amps] pole transformer (score: 1)
Author: Pete Smith <n4zr@contesting.com>
Date: Tue, 03 Feb 2009 07:02:37 -0500
Hey, guys, why not accept the best advice available, from CDC? It's a lot more measured, and qualified, than either of your positions. http://www.atsdr.cdc.gov/tfacts17.html 73, Pete ________________
/archives//html/Amps/2009-02/msg00049.html (14,821 bytes)

316. Re: [Amps] SB-220's, 3-500's, some history (score: 1)
Author: Pete Smith <n4zr@contesting.com>
Date: Sat, 07 Feb 2009 06:57:18 -0500
FWIW, W8JI said that early SB-220s had closer-spaced tuning caps, so if any arcing was to occur it would happen there. Later model 220s and 221s, he said, had wider tune cap spacing, which made the b
/archives//html/Amps/2009-02/msg00172.html (24,643 bytes)

317. [Amps] The SB-220 Mystique (score: 1)
Author: Pete Smith <n4zr@contesting.com>
Date: Tue, 10 Feb 2009 13:32:24 -0500
A couple of things occur to me to explain their continuing popularity: -- tubes are instant-on, almost immortal, and not that expensive to replace. -- tank circuit is capable of matching fairly sever
/archives//html/Amps/2009-02/msg00274.html (6,569 bytes)

318. Re: [Amps] SB-220 troubles (score: 1)
Author: Pete Smith <n4zr@contesting.com>
Date: Fri, 13 Feb 2009 06:32:41 -0500
OK, here's an interesting design exercise - we need an interlock that *does* protect the operator and "doesn't* kill the power supply. How would you do it? Or can it be done? Otherwise, I'm inclined
/archives//html/Amps/2009-02/msg00407.html (8,387 bytes)

319. [Amps] Harris amps (score: 1)
Author: Pete Smith <n4zr@contesting.com>
Date: Thu, 19 Feb 2009 10:26:11 -0500
I am interested in possibly obtaining one of the Harris amps in the RF-10x series. I have heard of people having great results with the RF-102A in amateur service, at full amateur power, including co
/archives//html/Amps/2009-02/msg00558.html (6,931 bytes)

320. [Amps] Parasitic suppressor resistors - think film OK? (score: 1)
Author: Pete Smith <n4zr@contesting.com>
Date: Sat, 28 Feb 2009 06:09:53 -0500
Would thick film power resistors as made by Caddock, Ohmite et al, be acceptable in parasitic suppressor service at HF. They are billed as "very low inductance". The TO-220 case would require a diffe
/archives//html/Amps/2009-02/msg00706.html (6,701 bytes)

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