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Total 406 documents matching your query.

341. Re: [Amps] Alpha 87A Won't Transmit (score: 1)
Author: Victor Rosenthal 4X6GP <k2vco.vic@gmail.com>
Date: Fri, 9 Apr 2021 15:38:38 +0300
_______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2021-04/msg00052.html (9,435 bytes)

342. Re: [Amps] Alpha 87A Power Supply Question (score: 1)
Author: Victor Rosenthal <k2vco.vic@gmail.com>
Date: Tue, 4 May 2021 08:46:00 +0300
Regardless of hum issues, the 220v 3 wire receptacles should be connected to ground, not neutral. It's a safety issue. Victor 4X6GP _______________________________________________ Amps mailing list A
/archives//html/Amps/2021-05/msg00007.html (16,643 bytes)

343. Re: [Amps] Cleaning open frame TR relay (score: 1)
Author: Victor Rosenthal 4X6GP <k2vco.vic@gmail.com>
Date: Wed, 30 Jun 2021 20:14:30 +0300
I cut strips of cardstock about 1 cm wide, spray a little Deoxit on them, and put them between the contacts while applying a little pressure to keep the contacts closed. Then I push them back and for
/archives//html/Amps/2021-06/msg00026.html (8,238 bytes)

344. Re: [Amps] 2K Classic X filament issue (score: 1)
Author: Victor Rosenthal 4X6GP <k2vco.vic@gmail.com>
Date: Tue, 3 Aug 2021 21:56:25 +0300
I would have said the same, except that the filaments are in series. That implies that the same current must be flowing through both of them. If one set of contacts is dirty, then the current through
/archives//html/Amps/2021-08/msg00002.html (9,451 bytes)

345. Re: [Amps] toroid tank coil heating up (score: 1)
Author: Victor Rosenthal 4X6GP <k2vco.vic@gmail.com>
Date: Sun, 26 Sep 2021 20:12:45 +0300
_______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2021-09/msg00019.html (7,123 bytes)

346. Re: [Amps] toroid tank coil heating up (score: 1)
Author: Victor Rosenthal <k2vco.vic@gmail.com>
Date: Sun, 26 Sep 2021 20:15:10 +0300
The blue type ( -1) would give you more inductance with fewer turns on 160 and 80. I suspect it would run cooler. I don't know how, or if, it would work on 40. You might try a stack of one of each (O
/archives//html/Amps/2021-09/msg00020.html (8,519 bytes)

347. Re: [Amps] TL-922A on 17 & 12 (score: 1)
Author: Victor Rosenthal <k2vco.vic@gmail.com>
Date: Tue, 12 Oct 2021 05:50:00 +0300
Yes, it does work, although output is slightly lower than other bands. I use my tl922 on the WARC bands as follows: 30m - bandswitch on 20 17m - bs on 15 12m - bs on 10 Power output is 1 - 1.1 kW com
/archives//html/Amps/2021-10/msg00048.html (7,825 bytes)

348. Re: [Amps] Verify "Q" (score: 1)
Author: Victor Rosenthal 4X6GP <k2vco.vic@gmail.com>
Date: Fri, 15 Oct 2021 06:43:25 +0300
You have to leave the plates connected, because the output capacitance of the tubes is a significant part of the tank circuit. The ARRL handbook talks about Q from 10 to 15. It is determined by the l
/archives//html/Amps/2021-10/msg00065.html (8,428 bytes)

349. Re: [Amps] Drifting Power (score: 1)
Author: Victor Rosenthal <k2vco.vic@gmail.com>
Date: Tue, 19 Oct 2021 19:26:06 +0300
The B&W 800 isn't suitable for 160m or for WARC bands. Victor 4X6GP _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/
/archives//html/Amps/2021-10/msg00076.html (12,048 bytes)

350. Re: [Amps] 1:9 un-un for grid driven tetrode (score: 1)
Author: Victor Rosenthal 4X6GP <k2vco.vic@gmail.com>
Date: Mon, 25 Oct 2021 22:07:38 +0300
What I did with a 4CX1000A AB1 amplifier was to put a 50 ohm non-inductive resistor from grid to cathode, and feed it through a pi-section lowpass filter (I used 35 MHz as the cutoff). The input capa
/archives//html/Amps/2021-10/msg00096.html (10,725 bytes)

351. Re: [Amps] QRO Technologies HF2000 plate choke, cont. (score: 1)
Author: Victor Rosenthal 4X6GP <k2vco.vic@gmail.com>
Date: Mon, 8 Nov 2021 10:04:55 +0200
One procedure to test and adjust a choke is this: 1. Short it in place and check for resonances in the ham bands with a GDO. The short makes it possible to find series resonances. Leave the tube and
/archives//html/Amps/2021-11/msg00011.html (8,617 bytes)

352. [Amps] SiC mosfets (score: 1)
Author: Vic Rosenthal <k2vco.vic@gmail.com>
Date: Tue, 23 Nov 2021 13:01:48 +0200
I recently got an ad from Mouser Electronics for silicon carbide mosfets. They talk about fast switching times, and they are rated at 1200 volts and many amps, at low duty cycles. Has anyone looked a
/archives//html/Amps/2021-11/msg00027.html (6,358 bytes)

353. Re: [Amps] Triode Amps (score: 1)
Author: Victor Rosenthal 4X6GP <k2vco.vic@gmail.com>
Date: Thu, 2 Dec 2021 22:38:19 +0200
_______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2021-12/msg00014.html (7,453 bytes)

354. Re: [Amps] AL82 pi network C2 failure (score: 1)
Author: Victor Rosenthal 4X6GP <k2vco.vic@gmail.com>
Date: Wed, 8 Dec 2021 10:44:07 +0200
_______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2021-12/msg00063.html (6,900 bytes)

355. Re: [Amps] AL82 pi network C2 failure (score: 1)
Author: Victor Rosenthal <k2vco.vic@gmail.com>
Date: Thu, 9 Dec 2021 11:25:06 +0200
It is possible to fix this. I had a similar problem with the loading capacitor in my TL922, due me stupidly operating with a high SWR ("I'll just finish the contest and then I'll fix the antenna"). F
/archives//html/Amps/2021-12/msg00068.html (11,544 bytes)

356. Re: [Amps] DX-100B CW Keying (score: 1)
Author: Victor Rosenthal 4X6GP <k2vco.vic@gmail.com>
Date: Sat, 1 Jan 2022 05:27:22 +0200
_______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2021-12/msg00078.html (7,091 bytes)

357. Re: [Amps] DX-100B CW Keying (score: 1)
Author: Victor Rosenthal <k2vco.vic@gmail.com>
Date: Sat, 1 Jan 2022 08:27:22 +0200
I think the DX100B is different from the original DX100. But what do you care? You can measure the voltage, the polarity, and the current with your VOM. That's all you need to know. 73, Victor, 4X6GP
/archives//html/Amps/2022-01/msg00000.html (6,752 bytes)

358. Re: [Amps] Western Electric (score: 1)
Author: Victor Rosenthal 4X6GP <k2vco.vic@gmail.com>
Date: Wed, 23 Mar 2022 05:28:22 +0200
It's not the historical Western Electric. Like many other well-known brand names, the name and logo were sold. Wikipedia says "As of 2013, the stylized Western Electric brand name survives as the tra
/archives//html/Amps/2022-03/msg00043.html (11,782 bytes)

359. Re: [Amps] Kenwood TL-922 Loading Cap Needed & AL82 Plate Tuning (score: 1)
Author: Victor Rosenthal 4X6GP <k2vco.vic@gmail.com>
Date: Tue, 12 Apr 2022 21:53:34 +0300
I did this on my TL-922. The loading cap arced after I very stupidly ran it with high SWR. I took the cap out -- it was impossible to do it in place -- and used a needle file, relay burnishing tool,
/archives//html/Amps/2022-04/msg00008.html (11,733 bytes)

360. [Amps] TL922 failure (score: 1)
Author: Victor Rosenthal 4X6GP <k2vco.vic@gmail.com>
Date: Fri, 13 May 2022 10:02:22 +0300
After about 10 years of almost daily use, my TL922 has failed. When I turn it on, the GFI for my radio room immediately -- instantly -- pops. An ohmmeter from either line pin on the power plug to the
/archives//html/Amps/2022-05/msg00003.html (7,153 bytes)

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