Search String: Display: Description: Sort:

Results:

References: [ +from:k2vco.vic@gmail.com: 406 ]

Total 406 documents matching your query.

241. Re: [Amps] 3-500Z tube problems (score: 1)
Author: Vic Rosenthal 4X6GP <k2vco.vic@gmail.com>
Date: Wed, 15 Jun 2016 19:37:24 +0300
Nothing's new under the sun. 73, Vic, 4X6GP Rehovot, Israel Formerly K2VCO http://www.qsl.net/k2vco/ 1986 to 1989. See http://lists.contesting.com/_amps/2014-04/msg00255.html. Someone with the callsi
/archives//html/Amps/2016-06/msg00055.html (9,062 bytes)

242. Re: [Amps] Alpha 87a Low receive (score: 1)
Author: Vic Rosenthal 4X6GP <k2vco.vic@gmail.com>
Date: Wed, 15 Jun 2016 19:43:44 +0300
Just one data point, but I had an 86 for at least a year, used it heavily and the PIN diodes were fine. I am sure I accidentally transmitted into the wrong antenna several times. I did have a pretty
/archives//html/Amps/2016-06/msg00057.html (10,160 bytes)

243. Re: [Amps] AL-80A - Won't tune on 160m. (score: 1)
Author: Vic Rosenthal 4X6GP <k2vco.vic@gmail.com>
Date: Mon, 5 Sep 2016 06:26:57 +0300
This is a common problem with this amp and the SB-1000 which is similar. You don't need to operate on 160m for this to happen. Here is an article which discusses the placement of a "corona washer" on
/archives//html/Amps/2016-09/msg00006.html (10,053 bytes)

244. Re: [Amps] TL-922 80m load issue (score: 1)
Author: Vic Rosenthal 4X6GP <k2vco.vic@gmail.com>
Date: Sun, 18 Sep 2016 04:13:11 +0300
I have always had a similar issue with my TL922 on the CW portion of 80 and the low end of 160. I too checked everything, including the capacitance of the padder, and found nothing wrong. I finally r
/archives//html/Amps/2016-09/msg00090.html (11,605 bytes)

245. Re: [Amps] Amplifier output power delivery .... (score: 1)
Author: Vic Rosenthal 4X6GP <k2vco.vic@gmail.com>
Date: Mon, 26 Sep 2016 06:23:05 +0300
The Alpha will produce 1500 watts, even RTTY. The TL922 will put out about 1200 CW or SSB, but the transformer is a bit small for RTTY, and will overheat if you don't reduce the power. The TL922 will
/archives//html/Amps/2016-09/msg00119.html (8,568 bytes)

246. Re: [Amps] TL-922(A) Recent Acquisition (score: 1)
Author: Vic Rosenthal 4X6GP <k2vco.vic@gmail.com>
Date: Tue, 25 Oct 2016 16:47:12 +0300
Very interesting about reversing the bottom plate, but I wouldn't do this. The holes are where they are to cool the transformer. If you have trouble with insufficient cooling, replace the fan with a
/archives//html/Amps/2016-10/msg00115.html (10,414 bytes)

247. Re: [Amps] SB-220 HV meter on zero (score: 1)
Author: Vic Rosenthal <k2vco.vic@gmail.com>
Date: Wed, 2 Nov 2016 07:44:31 +0200
Make a shorting stick -- a dry wood or fiberglass stick about 16" long with a hook at one end, and a wire from the hook going to a good-quality alligator clip. When you open the amplifier, connect th
/archives//html/Amps/2016-11/msg00014.html (8,371 bytes)

248. Re: [Amps] Glitch resistor (score: 1)
Author: Vic Rosenthal <k2vco.vic@gmail.com>
Date: Mon, 14 Nov 2016 19:55:10 +0200
As I understand it, the glitch resistor is not supposed to be a fuse. In the event of a flashover, it is supposed to limit the current so that components (even the tube) won't be damaged in the time
/archives//html/Amps/2016-11/msg00042.html (8,596 bytes)

249. Re: [Amps] TL-922(A) Recent Acquisition (score: 1)
Author: Vic Rosenthal <k2vco.vic@gmail.com>
Date: Sun, 27 Nov 2016 07:30:28 +0200
I would definitely replace it with vacuum relays, or a vacuum relay plus a reed relay. The stock relay tends to hot switch with semi-QSK CW and SSB VOX. It isn't worth saving. Vic 4X6GP _____________
/archives//html/Amps/2016-11/msg00139.html (13,089 bytes)

250. Re: [Amps] TL-922(A) Recent Acquisition (score: 1)
Author: Vic Rosenthal <k2vco.vic@gmail.com>
Date: Sun, 27 Nov 2016 07:36:48 +0200
Don't bother removing it. Just disconnect it. There is plenty of room for vacuum relays. Vic 4X6GP _______________________________________________ Amps mailing list Amps@contesting.com http://lists.c
/archives//html/Amps/2016-11/msg00140.html (9,259 bytes)

251. Re: [Amps] "Conventional" current flow (score: 1)
Author: Vic Rosenthal <k2vco.vic@gmail.com>
Date: Fri, 9 Dec 2016 08:05:27 +0200
I don't think what he wrote is either incomprehensible or nonsense. I don't pretend to understand quantum mechanics intuitively (maybe humans, whose ability to understand things developed from the ne
/archives//html/Amps/2016-12/msg00209.html (15,367 bytes)

252. Re: [Amps] HIGH FILAMENT VOLTAGE (score: 1)
Author: Vic Rosenthal <k2vco.vic@gmail.com>
Date: Sun, 11 Dec 2016 08:07:05 +0200
And the meter should be specified as measuring "true rms". Vic 4X6GP _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo
/archives//html/Amps/2016-12/msg00267.html (8,207 bytes)

253. [Amps] TL922 efficiency (score: 1)
Author: Vic Rosenthal 4X6GP <k2vco.vic@gmail.com>
Date: Mon, 12 Dec 2016 20:50:04 +0200
I suspect my measurements are incorrect, and possibly someone with another TL922 can give me a sanity check. On 40 meters, I am measuring the following into a dummy load: Output: 1200 watts (several
/archives//html/Amps/2016-12/msg00317.html (7,161 bytes)

254. Re: [Amps] Alpha 9500 Idling Current (score: 1)
Author: Vic Rosenthal 4X6GP <k2vco.vic@gmail.com>
Date: Thu, 29 Dec 2016 20:49:27 +0200
I don't see the point of RF-operated EBS (especially for CW) unless the driver is poorly designed. If the transceiver has a key out line that is activated a few ms before RF is output, then that can
/archives//html/Amps/2016-12/msg00512.html (8,605 bytes)

255. Re: [Amps] FCC Denies Expert Linears' Request for Waiver of 15 dB Rule (score: 1)
Author: Vic Rosenthal 4X6GP <k2vco.vic@gmail.com>
Date: Tue, 3 Jan 2017 22:21:57 +0200
The TS850S (and probably other transceivers) had an internal pot that could be adjusted to set the maximum output. In the service manual, it said to set this for 100w output with the drive set in suc
/archives//html/Amps/2017-01/msg00044.html (10,002 bytes)

256. [Amps] Diagnosing relay problem (score: 1)
Author: Vic Rosenthal <k2vco.vic@gmail.com>
Date: Sun, 8 Jan 2017 08:34:57 +0200
I have recently been suffering from intermittent attenuation of RX signals through my amplifier, which has a vacuum relay (Jennings RJ1-A) in the output and a HG d'Italia relay from max gain (see her
/archives//html/Amps/2017-01/msg00164.html (7,377 bytes)

257. Re: [Amps] Decline of homebrewing? (score: 1)
Author: Vic Rosenthal 4X6GP <k2vco.vic@gmail.com>
Date: Sun, 8 Jan 2017 11:25:50 +0200
The worst amplifier-building injury that ever I suffered was when I was building my first 813 amp at age 16. I was drilling a piece of copper for a strap in the tank circuit, holding it in my hand (!
/archives//html/Amps/2017-01/msg00168.html (12,145 bytes)

258. Re: [Amps] Diagnosing relay problem (score: 1)
Author: Vic Rosenthal <k2vco.vic@gmail.com>
Date: Sun, 08 Jan 2017 18:45:33 +0200
I'm not a big contester, but I do use QSK often. The vacuum relay should be good for 2,000,000 operations. The relays have been in place for about 4.5 years. -- Vic 4X6GP ____________________________
/archives//html/Amps/2017-01/msg00182.html (9,924 bytes)

259. Re: [Amps] Diagnosing relay problem (score: 1)
Author: Vic Rosenthal 4X6GP <k2vco.vic@gmail.com>
Date: Mon, 9 Jan 2017 00:14:09 +0200
I took it apart and tested the relays individually with an ohmmeter. The HI-G d'Italia relay was the problem, as several of you suggested. I replaced it, cursing the engineers that had made it so har
/archives//html/Amps/2017-01/msg00192.html (9,995 bytes)

260. Re: [Amps] COLLINS 30L-1 TUNING VARIABLE CAPACITOR ALIGNMENT (score: 1)
Author: Vic Rosenthal <k2vco.vic@gmail.com>
Date: Mon, 16 Jan 2017 07:32:58 +0200
Fully meshed. Lower frequency = more capacitance. Vic 4X6GP _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2017-01/msg00272.html (9,326 bytes)

Current List: 241 - 260
Page: [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16] [17] [18] [19] [20]
This search system is powered by Namazu