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Total 1413 documents matching your query.

301. [Amps] Fuses (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Sat, 8 Jan 2011 04:25:50 -0800
Who makes it and what's the model number? I'd like to see the specs on it especially the UL test results. When I retired in 2000 the only way they were able to get a breaker to clear a fault in less
/archives//html/Amps/2011-01/msg00082.html (14,841 bytes)

302. [Amps] Fuses (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Sun, 9 Jan 2011 05:03:19 -0800
Down in prosser, WA about 30 years ago they had a problem with a potato processing plant and a mechanic came running into the panel room and before anyone could stop him threw the main 480v 3 phase b
/archives//html/Amps/2011-01/msg00106.html (10,410 bytes)

303. [Amps] Fuses (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Sun, 9 Jan 2011 07:24:48 -0800
Date: Sat, 8 Jan 2011 19:36:03 -0500 From: "Carl" <km1h@jeremy.mv.com> Subject: Re: [Amps] Fuses To: "James R Carr" <n7fcf@hctc.com>, "Roger \(K8RI\)" <sub1@rogerhalstead.com>, <amps@contesting.com>
/archives//html/Amps/2011-01/msg00109.html (9,500 bytes)

304. [Amps] TWT Protection (was fuses) (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Sun, 9 Jan 2011 08:13:23 -0800
Hi Ian, it is good to hear from you again and thanks for the information. As you suggested, I am thinking that a second vacuum relay would be a good solution to the problem. If it was wired to shunt
/archives//html/Amps/2011-01/msg00112.html (8,805 bytes)

305. [Amps] I answered it. (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Sat, 29 Jan 2011 19:12:56 -0800
good. [ a full size 40m yagi is only 4.2 db]. All these dbs' start to add up. Double the power output AND increase the ant gain by 3db..and now you have 6 db..which is nothing to sneeze at. Now incre
/archives//html/Amps/2011-01/msg00413.html (8,997 bytes)

306. [Amps] I answered it. (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Sun, 30 Jan 2011 03:41:30 -0800
It is more then likely that those on a city lot who crank their power output way up will run into trouble with their neighborhood. 73 Peter neighbors' bitching..yet. A buddy had severe RFI with his 8
/archives//html/Amps/2011-01/msg00422.html (10,850 bytes)

307. [Amps] What to buy? (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Sun, 30 Jan 2011 06:11:27 -0800
ORIGINAL MESSAGE: REPLY: Maybe, maybe not. I owned a Command HF-2500 (now taken over by Palstar) and twice burned up the plate tank toroid operating full power RTTY on 40 meters. Twice!! $$$ I sold t
/archives//html/Amps/2011-01/msg00425.html (9,334 bytes)

308. [Amps] What to buy? (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Thu, 3 Feb 2011 04:02:13 -0800
Date: Mon, 31 Jan 2011 10:52:57 -0500 From: "Carl" <km1h@jeremy.mv.com> Subject: Re: [Amps]To: What to buy? Hmmm, ferrite has never been recommended for RF tank circuits that Im aware of. Ferrite is
/archives//html/Amps/2011-02/msg00016.html (9,586 bytes)

309. Re: [Amps] What to buy? (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Sat, 5 Feb 2011 04:59:07 -0800
stone cold on both bands. They used 1/4" silver plated tubing on 20-15-10m...which runs blazing hot on 15+10m. One would have thought that on 15m...that the heat was migrate into the remainder of the
/archives//html/Amps/2011-02/msg00026.html (9,089 bytes)

310. [Amps] What to buy? (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Sat, 5 Feb 2011 07:08:39 -0800
If toroids run too hot there is something too wrong with the design. Ive been using a stack of T225-2B's for decades in adding 160M to several amps in the old 2000W PEP INPUT and 1200W output range.
/archives//html/Amps/2011-02/msg00030.html (11,469 bytes)

311. [Amps] Ebay selling CB amps (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Sat, 19 Feb 2011 05:35:18 -0800
Is Ebay breaking any FCC rules by selling CB amps? Just curious. amps..or 10+12m amps.. there is no problem. They just list em as monoband ham amps. Riley H said he gave up on the 11m band [ that was
/archives//html/Amps/2011-02/msg00140.html (8,545 bytes)

312. [Amps] door knob capacitors (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Mon, 7 Mar 2011 02:22:48 -0800
I'm looking at those doorknob caps for sale from Ameritron. Actually they are listed as MFJ but it's all the same now. They have two types: 500 pF 7.5 KV and 170 pF 7.5 KV. They are made by High Ener
/archives//html/Amps/2011-03/msg00061.html (10,581 bytes)

313. [Amps] Alpha 8410 Pics (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Mon, 7 Mar 2011 02:49:39 -0800
Very nice and its easy to spot the lineage right back to the vintage 274 model. Is that an Ameritron plate choke? Alpha ripped off the idea from Ameritron. The older Alpha choke as used in the 87-A w
/archives//html/Amps/2011-03/msg00062.html (10,481 bytes)

314. [Amps] Homebrew is back.. (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Tue, 29 Mar 2011 04:17:44 -0700
Hi Roger et al, I use a pair of 813s in parallel grounded-grid service here in my homebrewed KW amplifier, and--I'm blushing as I type this!--but I have NEVER EVER purchased any of the jugs that are
/archives//html/Amps/2011-03/msg00240.html (11,782 bytes)

315. Re: [Amps] Homebrew is back.. (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Tue, 29 Mar 2011 07:51:44 -0700
&&&& And you can easily get nice sounding audio with 4-6 khz wide ESSB....and still only use one half the BW of an AM signal. later... Jim VE7RF _______________________________________________ Amps m
/archives//html/Amps/2011-03/msg00247.html (9,945 bytes)

316. [Amps] PI Calculation using G3SEK Excel Spreadsheet (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Fri, 1 Apr 2011 14:59:30 -0700
Are these values correct (in ??) for two 3-400Z tubes at 2500vdc and 800ma Plate Current? There is so much information there I get lost. Input Supply voltage E 2500 V Input Max DC anode current Ia 0.
/archives//html/Amps/2011-04/msg00013.html (8,397 bytes)

317. [Amps] what is a 4 wire 240VAC service? (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Mon, 4 Apr 2011 00:30:24 -0700
street..BUT one of those two wires is GRNDED at the pole. In essence, you have 1 hot and one neutral/grnd coming in off the street. So you are getting UB balanced 230 vac, Here in nA, we get 240 vac
/archives//html/Amps/2011-04/msg00073.html (9,950 bytes)

318. [Amps] Alpha vs. Henry (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Mon, 4 Apr 2011 03:17:55 -0700
Not according to Collins. They say that the choke should be resonant at 120 Hz with minimum critical current, eg bleeder current, which keeps voltage from soaring. As current draw increases the induc
/archives//html/Amps/2011-04/msg00076.html (10,688 bytes)

319. [Amps] what is a 4 wire 240VAC service? (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Mon, 4 Apr 2011 03:49:33 -0700
There are a couple of things I don't understand: :-) (1) When it became clear, probably close to 100 years ago, that 120V was too low a voltage to efficiently power room (or tubes with handles) heate
/archives//html/Amps/2011-04/msg00077.html (11,528 bytes)

320. [Amps] Alpha vs Henry (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Mon, 4 Apr 2011 04:40:03 -0700
George, If 160m is of interest to you, may want to re-evaluate Henry amps, including the 5K. Concerning mods for the 77Dx/Sx: few mods have been published and either version of the 77 is fine as it i
/archives//html/Amps/2011-04/msg00078.html (10,582 bytes)

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