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Total 406 documents matching your query.

301. Re: [Amps] AL-80A - Pi/Pi-L Switch Wafer Failure due to arcing (score: 1)
Author: Victor Rosenthal 4X6GP <k2vco.vic@gmail.com>
Date: Sat, 28 Jul 2018 05:47:20 +0300
_______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2018-07/msg00082.html (6,719 bytes)

302. Re: [Amps] Help with Henry 2K-2 (score: 1)
Author: Victor Rosenthal 4X6GP <k2vco.vic@gmail.com>
Date: Thu, 6 Sep 2018 18:06:09 +0300
_______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2018-09/msg00007.html (6,811 bytes)

303. Re: [Amps] Flex Power Genius XL 2KW amplifier (score: 1)
Author: Vic Rosenthal <k2vco.vic@gmail.com>
Date: Fri, 12 Oct 2018 19:26:55 +0300
Most CW ops that do not use full QSK do operate semi-QSK. And in that case the delay between the amp key signal being asserted and the t/r relays closing and settling reliably is just as critical as
/archives//html/Amps/2018-10/msg00038.html (14,465 bytes)

304. Re: [Amps] Flex Power Genius XL 2KW amplifier (score: 1)
Author: Victor Rosenthal 4X6GP <k2vco.vic@gmail.com>
Date: Wed, 17 Oct 2018 15:49:32 +0300
I don't use full QSK for ragchewing or running stations, in which case I use semi-QSK with a short delay adjusted to allow the relays to open between words. I do use it when I am trying to work a DX
/archives//html/Amps/2018-10/msg00059.html (11,350 bytes)

305. Re: [Amps] Fwd: Fwd: *** PGXL Questions on CW Operation (score: 1)
Author: Victor Rosenthal 4X6GP <k2vco.vic@gmail.com>
Date: Wed, 31 Oct 2018 16:37:14 +0200
1. Jim, you said "all communication is via the internet," but in the quote from Gerald below, he said "ethernet." There is a big difference since local ethernet is very fast, while the internet would
/archives//html/Amps/2018-11/msg00000.html (17,646 bytes)

306. [Amps] Input relay for QSK amp (score: 1)
Author: Victor Rosenthal 4X6GP <k2vco.vic@gmail.com>
Date: Tue, 4 Dec 2018 12:21:21 +0200
I'm trying to choose a relay to use as the input relay in a QSK amp. I have been very satisfied with the Jennings RJ1-A as an output relay. The input relay in this circuit needs to be DPDT, or I'd ju
/archives//html/Amps/2018-12/msg00015.html (7,433 bytes)

307. Re: [Amps] Input relay for QSK amp (score: 1)
Author: Victor Rosenthal 4X6GP <k2vco.vic@gmail.com>
Date: Tue, 4 Dec 2018 15:53:04 +0200
_______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2018-12/msg00017.html (7,622 bytes)

308. Re: [Amps] Input relay for QSK amp (score: 1)
Author: Victor Rosenthal 4X6GP <k2vco.vic@gmail.com>
Date: Tue, 4 Dec 2018 16:15:30 +0200
_______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2018-12/msg00019.html (7,762 bytes)

309. [Amps] TL922 failure (score: 1)
Author: Victor Rosenthal 4X6GP <k2vco.vic@gmail.com>
Date: Sun, 9 Dec 2018 07:18:01 +0200
I'm about to take apart my TL922, which has worked perfectly for at least 6 years -- until this morning. I would appreciate suggestions as to what could be wrong. Initial symptoms: 1) Low power outpu
/archives//html/Amps/2018-12/msg00059.html (7,503 bytes)

310. Re: [Amps] Input relay for QSK amp (score: 1)
Author: Victor Rosenthal 4X6GP <k2vco.vic@gmail.com>
Date: Wed, 19 Dec 2018 06:28:45 +0200
I agree about the need for "lock on". I was planning on implementing an SWR protection circuit, in which high SWR would open the amp key line, when I suddenly realized that this is exactly what NOT t
/archives//html/Amps/2018-12/msg00093.html (10,219 bytes)

311. Re: [Amps] AL-80B Problem (score: 1)
Author: Victor Rosenthal 4X6GP <k2vco.vic@gmail.com>
Date: Fri, 25 Jan 2019 04:12:19 +0200
_______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2019-01/msg00119.html (7,205 bytes)

312. Re: [Amps] I need advice on a TL-922 with Harbach Soft-Start module (score: 1)
Author: Victor Rosenthal 4X6GP <k2vco.vic@gmail.com>
Date: Fri, 25 Jan 2019 05:33:53 +0200
The fan in the 922 is a 120v fan. It runs off of half the primary when the amp is configured for 220-240. There is a somewhat complicated circuit that keeps it running for a while after the amp is sh
/archives//html/Amps/2019-01/msg00120.html (9,226 bytes)

313. Re: [Amps] AL-80B Problem (score: 1)
Author: Victor Rosenthal 4X6GP <k2vco.vic@gmail.com>
Date: Fri, 25 Jan 2019 06:58:36 +0200
_______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2019-01/msg00121.html (7,318 bytes)

314. Re: [Amps] SS Amps building a water cooled (score: 1)
Author: Victor Rosenthal 4X6GP <k2vco.vic@gmail.com>
Date: Mon, 11 Feb 2019 16:07:36 +0200
_______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2019-02/msg00033.html (7,007 bytes)

315. Re: [Amps] clipperton l low output on ssb (score: 1)
Author: Victor Rosenthal 4X6GP <k2vco.vic@gmail.com>
Date: Tue, 19 Feb 2019 18:53:01 +0200
If you are looking at an average-reading power meter, then the output on SSB will look much lower than on CW because of the low duty cycle. If your power meter has a peak-reading mode, that's what yo
/archives//html/Amps/2019-02/msg00052.html (8,368 bytes)

316. Re: [Amps] Are Amps Slow on the uptake? Or is it just me? (score: 1)
Author: Victor Rosenthal 4X6GP <k2vco.vic@gmail.com>
Date: Sat, 29 Jun 2019 19:18:16 +0300
Jeff, Some amps that have a mechanical relay for t/r switching can chop off the first dit in semi- or full QSK, but usually not more than that. This can cause hot-switching of the relay, which can da
/archives//html/Amps/2019-06/msg00074.html (9,933 bytes)

317. Re: [Amps] Henry 2K desktop amp (score: 1)
Author: Victor Rosenthal 4X6GP <k2vco.vic@gmail.com>
Date: Sat, 29 Jun 2019 19:22:19 +0300
Some Henrys have the filaments in series, but if one tube is not lit, that isn't the case with yours! Anyway, you can pull out the dead one and it should more or less behave in exactly the same way a
/archives//html/Amps/2019-06/msg00075.html (9,084 bytes)

318. Re: [Amps] 3-500Z not lit (score: 1)
Author: Victor Rosenthal 4X6GP <k2vco.vic@gmail.com>
Date: Mon, 1 Jul 2019 19:48:56 +0300
I have swapped the grid clips with the filament clips. The grid clips, since they haven't heated up, are often in better shape. Usually the former filament clips still work OK on the grid pins, if yo
/archives//html/Amps/2019-07/msg00004.html (11,094 bytes)

319. Re: [Amps] HV Fuse (score: 1)
Author: Vic Rosenthal <k2vco.vic@gmail.com>
Date: Fri, 20 Sep 2019 22:34:14 +0300
Hi Paul, I dont think fuses in parallel are a good idea :-). But probably you werent serious. I dont know what the present rectifier modules are, but rather than trying to protect them with a fuse, I
/archives//html/Amps/2019-09/msg00047.html (10,211 bytes)

320. Re: [Amps] HV Fuse (score: 1)
Author: Vic Rosenthal <k2vco.vic@gmail.com>
Date: Sat, 21 Sep 2019 07:40:26 +0300
It would seem to me that if the fuses had slightly different resistances then one would blow first, followed by all the others. Interesting question: which would go first, the highest or the lowest R
/archives//html/Amps/2019-09/msg00052.html (11,792 bytes)


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