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References: [ +from:vic@rakefet.com: 418 ]

Total 418 documents matching your query.

201. Re: [Amps] R. MEASURES PRAYERS ANSWERED (score: 1)
Author: Vic K2VCO <vic@rakefet.com>
Date: Thu, 01 Jun 2006 08:46:14 -0700
They are talking about a grid-driven amplifier with link-coupled input and output. I think their idea is that the VHF grid circuit is formed by the inductance of the grid tuning capacitor's frame and
/archives//html/Amps/2006-06/msg00004.html (8,436 bytes)

202. Re: [Amps] Direct-grounding SB-220 grids (score: 1)
Author: Vic K2VCO <vic@rakefet.com>
Date: Tue, 06 Jun 2006 13:07:16 -0700
Copper strap would have lower inductance and is what I've used in my homebrew amplifiers. If you're going to bother changing it, might as well do it the best possible way. I don't see what the benefi
/archives//html/Amps/2006-06/msg00177.html (7,523 bytes)

203. Re: [Amps] teeny copper strap (score: 1)
Author: Vic K2VCO <vic@rakefet.com>
Date: Wed, 07 Jun 2006 08:31:27 -0700
I bought some small quantities of copper (they also have brass) sheet at a hobby shop. I use this a lot for model train projects! They have different thicknesses. I would suggest using some that's th
/archives//html/Amps/2006-06/msg00203.html (7,912 bytes)

204. Re: [Amps] Maximum RF output in practical application: 4-250A (score: 1)
Author: Vic K2VCO <vic@rakefet.com>
Date: Sun, 02 Jul 2006 08:03:19 -0700
This is great! I can finally achieve my goal of getting 1 KW CW from my favorite tube, the 813. It does complicate bandswitching, though. -- 73, Vic, K2VCO Fresno CA http://www.qsl.net/k2vco ________
/archives//html/Amps/2006-07/msg00052.html (8,448 bytes)

205. Re: [Amps] 4CX10 000J (score: 1)
Author: Vic K2VCO <vic@rakefet.com>
Date: Mon, 03 Jul 2006 07:52:38 -0700
This is apparently a problem with most or all modern transceivers. On our annual field day my club operates a CW and an SSB station. We use switched bandpass filters on both rigs and do our best to s
/archives//html/Amps/2006-07/msg00108.html (9,193 bytes)

206. Re: [Amps] L4-B Power Supply (score: 1)
Author: Vic K2VCO <vic@rakefet.com>
Date: Tue, 04 Jul 2006 11:19:10 -0700
If the original capacity provided adequate dynamic regulation and hum reduction then increasing the capacity will only store more energy which would do more damage in the event of an arc. I also don'
/archives//html/Amps/2006-07/msg00194.html (9,666 bytes)

207. Re: [Amps] Solid state amp (score: 1)
Author: Vic K2VCO <vic@rakefet.com>
Date: Thu, 06 Jul 2006 09:01:58 -0700
It's definitely real, I just recently saw the 1500 watt prototype. They had some delays getting some of the bits and pieces but it is expected to be available this year. -- 73, Vic, K2VCO Fresno CA h
/archives//html/Amps/2006-07/msg00243.html (6,882 bytes)

208. Re: [Amps] Switching Power Supplies (score: 1)
Author: Vic K2VCO <vic@rakefet.com>
Date: Fri, 14 Jul 2006 11:23:27 -0700
I had a borrowed 751 (not the A model) with the built-in switching supply for a time. It generated enough noise on receive to interfere with weak signal reception. I sent it to ICOM, and they fixed a
/archives//html/Amps/2006-07/msg00386.html (7,924 bytes)

209. Re: [Amps] 572B grid (score: 1)
Author: Vic K2VCO <vic@rakefet.com>
Date: Sun, 23 Jul 2006 10:44:08 -0700
This is very interesting, because it contradicts what I've believed: that the 572B offers no additional power output over the 811A unless you raise the plate voltage. But this bulletin says that simp
/archives//html/Amps/2006-07/msg00951.html (8,506 bytes)

210. Re: [Amps] 572B grid (score: 1)
Author: Vic K2VCO <vic@rakefet.com>
Date: Sun, 23 Jul 2006 10:49:03 -0700
I take it back. That's 33% *without* increasing drive. It's 75% if you increase drive! -- 73, Vic, K2VCO Fresno CA http://www.qsl.net/k2vco _______________________________________________ Amps mailin
/archives//html/Amps/2006-07/msg00952.html (8,524 bytes)

211. Re: [Amps] 572B grid (score: 1)
Author: Vic K2VCO <vic@rakefet.com>
Date: Sun, 23 Jul 2006 11:14:48 -0700
The mu of the Waters tube is 190 compared to 160 for the 811A. This is what they must mean by 'higher power sensitivity'. -- 73, Vic, K2VCO Fresno CA http://www.qsl.net/k2vco ________________________
/archives//html/Amps/2006-07/msg00956.html (8,507 bytes)

212. [Amps] TL-922 question (score: 1)
Author: Vic K2VCO <vic@rakefet.com>
Date: Wed, 26 Jul 2006 13:21:17 -0700
This should be noncontroversial. The TL-922 manual includes several warnings against operating the amplifier on CW in the SSB position (The CW/SSB switch changes the no-load plate voltage from about
/archives//html/Amps/2006-07/msg01186.html (7,440 bytes)

213. Re: [Amps] plexiglas isolation in coils (score: 1)
Author: Vic K2VCO <vic@rakefet.com>
Date: Fri, 28 Jul 2006 10:42:01 -0700
...but it covers 160 meters and WARC, which the SB220 doesn't. To avoid the flames, yes it can be made to work on the WARC bands but input SWR will be high. -- 73, Vic, K2VCO Fresno CA http://www.qsl
/archives//html/Amps/2006-07/msg01248.html (9,596 bytes)

214. [Amps] Hercules II power supply (score: 1)
Author: Vic K2VCO <vic@rakefet.com>
Date: Thu, 03 Aug 2006 11:11:55 -0700
Has anyone used a single Astron RS-70 power supply with the Tentec Hercules II? It seemed to me that it was a bit on the light side, but I wondered if anyone had tried it. -- 73, Vic, K2VCO Fresno CA
/archives//html/Amps/2006-08/msg00100.html (6,269 bytes)

215. Re: [Amps] Hercules II power supply (score: 1)
Author: Vic K2VCO <vic@rakefet.com>
Date: Thu, 03 Aug 2006 12:52:36 -0700
Thank you. I've been trying to avoid batteries. I did have a second RS-70 which had a terminal permitting the two to be paralleled. This worked fine delivering 100 amps for a Henry SS-750. Unfortunat
/archives//html/Amps/2006-08/msg00102.html (8,006 bytes)

216. Re: [Amps] Hercules II power supply (score: 1)
Author: Vic K2VCO <vic@rakefet.com>
Date: Thu, 03 Aug 2006 13:24:14 -0700
Well, from my point of view the only good battery is one that's outdoors! Actually, it wouldn't be *too* hard to drill a hole in the shack wall and make a little shelter outside, but I'd like to avoi
/archives//html/Amps/2006-08/msg00105.html (8,149 bytes)

217. Re: [Amps] Hercules II power supply (score: 1)
Author: Vic K2VCO <vic@rakefet.com>
Date: Thu, 03 Aug 2006 13:45:42 -0700
There isn't a nameplate. But it says "RS-70A" on the front panel. So I suppose the answer is 'no'. I'm aware of the issues involved in charging lead-acid batteries with a fixed voltage power supply,
/archives//html/Amps/2006-08/msg00107.html (7,493 bytes)

218. Re: [Amps] grid resonance (score: 1)
Author: Vic K2VCO <vic@rakefet.com>
Date: Fri, 04 Aug 2006 21:39:59 -0700
The bottom of the coil is connected to the chassis through the low impedance of the feed system. The vertical radiator has capacitance to the chassis (of course it has inductance, too). Sounds parall
/archives//html/Amps/2006-08/msg00167.html (9,658 bytes)

219. Re: [Amps] grid resonance (score: 1)
Author: Vic K2VCO <vic@rakefet.com>
Date: Sat, 05 Aug 2006 08:49:20 -0700
No. The vertical part has a capacitve reactance and a resistance, part of which is radiation resistance. The whole system has a lower Q than a lumped-constant parallel tuned circuit. The impedance se
/archives//html/Amps/2006-08/msg00186.html (10,819 bytes)

220. Re: [Amps] grid resonance (score: 1)
Author: Vic K2VCO <vic@rakefet.com>
Date: Sun, 06 Aug 2006 13:34:50 -0700
Let's say I take a coil and connect a capacitor across it. If I couple RF into the coil from my GDO, I think you'll agree that it's a parallel circuit. Now if you open the circuit and insert, say, an
/archives//html/Amps/2006-08/msg00229.html (10,833 bytes)

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