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Total 257 documents matching your query.

241. Re: [Amps] Dedicated 220AC Wiring for Amps.. (score: 1)
Author: Steve Thompson <g8gsq@ic24.net>
Date: Sat, 15 Oct 2005 08:14:09 +0100
I've got to stress that I've no experience of lightning problems, but I wonder whether a ground rod really contributes much. A 4' rod here measures around 200 ohms, a couple of shallow 30' wires clos
/archives//html/Amps/2005-10/msg00397.html (8,352 bytes)

242. Re: [Amps] AC wiring (score: 1)
Author: Steve Thompson <g8gsq@ic24.net>
Date: Sat, 15 Oct 2005 14:25:46 +0100
Alex Eban wrote: ...guys, losses are ALWAYS quadrupled! Losses follow the V^2/R law or, more appropriate I^2*R law. And current is average current, not peak current! Being picky, it's the rms current
/archives//html/Amps/2005-10/msg00405.html (7,821 bytes)

243. Re: [Amps] TWE T500M Linear amp (score: 1)
Author: Steve Thompson <g8gsq@ic24.net>
Date: Wed, 19 Oct 2005 22:15:01 +0100
I'm guessing that the short between the bases of the rf power transistors is a drawing error? Steve _______________________________________________ Amps mailing list Amps@contesting.com http://lists.
/archives//html/Amps/2005-10/msg00474.html (7,325 bytes)

244. Re: [Amps] TWE T500M Linear amp (score: 1)
Author: Steve Thompson <g8gsq@ic24.net>
Date: Thu, 20 Oct 2005 07:35:41 +0100
If it is using 8 x 100W transistors, then 500W broadband output is about right - 3-400W if you want anything approaching good linearity. Some versions of amps like this have a 100A meter on the panel
/archives//html/Amps/2005-10/msg00479.html (7,384 bytes)

245. Re: [Amps] Bird 43 Blown / Repair ? (score: 1)
Author: Steve Thompson <g8gsq@ic24.net>
Date: Sun, 23 Oct 2005 21:22:57 +0100
I wonder if that's likely to have blown the meter. The meter fsd is 30uA, the extra power will probably result in a current about twice that - I can't imagine 60uA burning a meter movement out. Maybe
/archives//html/Amps/2005-10/msg00550.html (7,430 bytes)

246. Re: [Amps] Racal Dana 9028P (score: 1)
Author: Steve Thompson <g8gsq@ic24.net>
Date: Thu, 27 Oct 2005 18:53:22 +0100
Is it 9028 or 9082? I have a couple of 9081/9082 - used as door stops mainly. They're ok as sources for single tone amplifer testing and for testing commercial FM radio kit, otherwise they're awful.
/archives//html/Amps/2005-10/msg00635.html (6,720 bytes)

247. Re: [Amps] Mobile high power (score: 1)
Author: Steve Thompson <g8gsq@ic24.net>
Date: Fri, 28 Oct 2005 07:33:26 +0100
I think it won't be long until 36V is commonplace - won't fix the problem of alternator size for the power, but will make the wiring easier. Steve _______________________________________________ Amps
/archives//html/Amps/2005-10/msg00647.html (7,940 bytes)

248. Re: [Amps] PSU Designer: How to model a glitch resistor ? (score: 1)
Author: Steve Thompson <g8gsq@ic24.net>
Date: Sat, 29 Oct 2005 14:42:21 +0100
What is strange? PSU designer will predict the volatge across the capacitors for different values of load resistance that you specify. The voltage at your PA will be this voltage less the drop in the
/archives//html/Amps/2005-10/msg00670.html (7,900 bytes)

249. Re: [Amps] shield an RF deck ? (score: 1)
Author: Steve Thompson <g8gsq@ic24.net>
Date: Mon, 31 Oct 2005 10:13:44 +0000
If the rack isn't specifically designed for rf purposes, you can't rely on the rf screening properties. Many have fully painted panels, and rely on wired connections for electrical safety only. The r
/archives//html/Amps/2005-10/msg00711.html (7,314 bytes)

250. Re: [Amps] [BULK] - Drake L-4B PSU burned resistor (score: 1)
Author: Steve Thompson <g8gsq@ic24.net>
Date: Tue, 01 Nov 2005 14:22:05 +0000
But that's only 35V across them. Many metal film resistors are a spiral on the form, and the gaps might arc if hv beyond the rating is applied. I'm with you all the way on their capacity to withstand
/archives//html/Amps/2005-11/msg00007.html (8,349 bytes)

251. Re: [Amps] Drake L-4B PSU burned resistor (score: 1)
Author: Steve Thompson <g8gsq@ic24.net>
Date: Wed, 02 Nov 2005 12:54:45 +0000
Vishay do a 'bolt down' 50W resistor which lists: Dielectric strength 3500V rms Limiting ekement voltage 1285V rms Maximum overload voltage 2500V rms There's overload and pulse ratings in the data.
/archives//html/Amps/2005-11/msg00025.html (8,184 bytes)

252. Re: [Amps] Drake L-4B PSU burned resistor (score: 1)
Author: Steve Thompson <g8gsq@ic24.net>
Date: Wed, 02 Nov 2005 14:51:35 +0000
Yes, I've had that happen with the ones built into an extruded aluminium casing. The Vishay ones I was looking at are flat, with a moulded covering. I imagine that the resistive element is a film on
/archives//html/Amps/2005-11/msg00029.html (8,332 bytes)

253. Re: [Amps] Metal-Clad Resistors (score: 1)
Author: Steve Thompson <g8gsq@ic24.net>
Date: Wed, 02 Nov 2005 15:23:45 +0000
I agree with your advice against 'metal clad' resistors in this situation - the Vishay ones I mentioned are not this type. Steve _______________________________________________ Amps mailing list Amps
/archives//html/Amps/2005-11/msg00031.html (7,089 bytes)

254. Re: [Amps] Meaning of "conduction cooled" (score: 1)
Author: Steve Thompson <g8gsq@ic24.net>
Date: Thu, 03 Nov 2005 17:12:05 +0000
But doesn't convection (and forced air) start with conduction between the hot surface and the air - so they're all conduction cooled? I'd say a 'conduction cooled' tube displaces the heat through a s
/archives//html/Amps/2005-11/msg00051.html (8,541 bytes)

255. Re: [Amps] Grounded Screen 4CX1500B (score: 1)
Author: Steve Thompson <g8gsq@ic24.net>
Date: Tue, 08 Nov 2005 12:39:24 +0000
I've seen them working fine with several different sockets - I've found any socket with a built in screen cap is ok at VHF. The original design had huge gain, something that was hidden in class C use
/archives//html/Amps/2005-11/msg00114.html (8,895 bytes)

256. Re: [Amps] Svetlana SK1A socket cathode connection (score: 1)
Author: Steve Thompson <g8gsq@ic24.net>
Date: Fri, 11 Nov 2005 09:43:41 +0000
Not on the ones I have. Steve _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2005-11/msg00138.html (7,178 bytes)

257. Re: [Amps] Svetlana SK1A socket cathode connection (score: 1)
Author: Steve Thompson <g8gsq@ic24.net>
Date: Fri, 11 Nov 2005 09:54:49 +0000
Doh! Try reading the question... They're floating on mine. Steve _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amp
/archives//html/Amps/2005-11/msg00139.html (6,990 bytes)

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