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1. Re: [Amps] Silver plating (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Fri, 10 Apr 2009 08:10:39 +0100; Clock restorers use something that works the same for resilvering chapter rings and other brass parts. Basically it's silver nitrate and salt. They also usually use a 'finisher' powder which (I think; /archives//html/Amps/2009-04/msg00116.html (8,531 bytes)
2. Re: [Amps] Silver plating (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Thu, 09 Apr 2009 20:53:08 +0100; From many years ago I recall an article in 'RF Design' where someone suggested that oxidation on copper (and other conductors) makes less difference than might be expected because the higher resistan; /archives//html/Amps/2009-04/msg00106.html (8,468 bytes)
3. Re: [Amps] HF power amp input impedance (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Tue, 07 Apr 2009 07:49:15 +0100; Whether it's bipolars of FETs, set the bias point by monitoring the current drawn and adjusting the bias voltage to get the current you want. Applying some nominal bias voltage to devices when you d; /archives//html/Amps/2009-04/msg00072.html (7,868 bytes)
4. Re: [Amps] Dentron mla-2500 meters (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Tue, 17 Mar 2009 07:57:22 +0000; No confusion this side of the pond - wavelength is measured in metres. Steve _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman; /archives//html/Amps/2009-03/msg00460.html (7,438 bytes)
5. Re: [Amps] Microwave Transformers? (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Wed, 11 Mar 2009 07:49:34 +0000; Microwave oven transformers can be very different one from another, even when the original appliance had the same nominal rating. A lot have quite high resistance windings for the power rating, so wi; /archives//html/Amps/2009-03/msg00303.html (8,591 bytes)
6. Re: [Amps] 813 screen (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Mon, 09 Mar 2009 07:26:47 +0000; I'll echo Carl's comments - I don't think it makes any difference at all. Mine ran at around 2kV and were rock solid stable, even without the dreaded suppressor. And yes, they look great! Steve PS n; /archives//html/Amps/2009-03/msg00251.html (7,513 bytes)
7. Re: [Amps] Step-start; improved circuit. (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Sun, 08 Mar 2009 07:42:35 +0000; I do a similar thing, but with a RC feeding the gate of a MOSFET with the relay in the drain. The turn on characteristics provide enough of a 'snap' action to activate the relay cleanly. Delightfull; /archives//html/Amps/2009-03/msg00239.html (8,614 bytes)
8. Re: [Amps] Amp Design Question... (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Sat, 14 Feb 2009 07:52:11 +0000; The (o) is probably representing a coaxial style connector for the HV connection. In some designs he uses pieces of pcb material or 'sandwich' construction against a chassis sidewall for the bypass c; /archives//html/Amps/2009-02/msg00442.html (7,940 bytes)
9. Re: [Amps] Alpha 77Dx Filament - No Free Lunch (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Mon, 26 Jan 2009 07:46:34 +0000; Where the intermittent connection bring about a short across the heater supply, is it robust enough to carry the short circuit current and take out a 15A fuse? I'd guess that the arcing when the cont; /archives//html/Amps/2009-01/msg00292.html (8,264 bytes)
10. Re: [Amps] Bypass SWR RJ1As (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Sat, 17 Jan 2009 08:53:07 +0000; If adding shunt C reduces the VSWR, then the relays are adding inductance in the line. When you have series L and shunt C you get a network that changes the impedance. If the inductance is low enough; /archives//html/Amps/2009-01/msg00137.html (7,040 bytes)
11. Re: [Amps] shielded HV connector (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Sat, 27 Dec 2008 08:17:14 +0000; For total safety I prefer SHV connectors. It's not possible to touch the centre pin on either half accidentally and they guarantee to make the ground first and break it last when mating. They use RG5; /archives//html/Amps/2008-12/msg00345.html (7,744 bytes)
12. Re: [Amps] Heathkit Warrior High Plate Current (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Tue, 21 Oct 2008 20:35:50 +0100; Forgive my ignorance about this amp, but 30mA with 75V of cutoff bias is 'normal'? Where is it going? I concur with the other comments about likely faults - but I'd add a question as to whether the; /archives//html/Amps/2008-10/msg00089.html (7,772 bytes)
13. Re: [Amps] RF Interference (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Sat, 11 Oct 2008 21:27:38 +0100; The point is to consider if a sensitive point might be high or low impedance. If it's low, a shunt capacitor won't do much, a series inductor will so the ferrite works - if it's high, the shunt capa; /archives//html/Amps/2008-10/msg00056.html (7,600 bytes)
14. Re: [Amps] Transformer reliability? 34yr old Collins... (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Fri, 03 Oct 2008 19:16:49 +0100; An alternative way to get the heat in it I've used without ruining my stove and/or marriage is to short the secondary and apply primary voltage through a variac. Wind the voltage up very slowly and; /archives//html/Amps/2008-10/msg00015.html (8,081 bytes)
15. Re: [Amps] digital wattmeter (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Thu, 25 Sep 2008 08:05:10 +0100; Buy whichever gives you the look, shape, size etc. that you want. Don't get carried away with the specification claims - you're unlikely to get the extreme accuracy in practice, and you don't need it; /archives//html/Amps/2008-09/msg00205.html (8,792 bytes)
16. Re: [Amps] 3-500Z glitch resistor (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Tue, 09 Sep 2008 22:14:22 +0100; A few times I've built in an inch or so of suitably sized bare wire just open between two terminals as a HV fuse. I've yet to have one blow, but shouldn't be any arcing problems if it does happen. St; /archives//html/Amps/2008-09/msg00094.html (8,527 bytes)
17. Re: [Amps] 3-500Z glitch resistor (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Mon, 08 Sep 2008 15:06:48 +0100; Agreed. One clarification for anyone looking up the Vishay part I mentioned - while they have the same footprint and similar shape to the metal cased resistors, they are totally different inside. The; /archives//html/Amps/2008-09/msg00044.html (7,515 bytes)
18. Re: [Amps] 3-500Z glitch resistor (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Mon, 08 Sep 2008 09:13:57 +0100; I like the look of Vishay RCH series or similar (Tyco do an equivalent). The 50W version is rated at 5.5W without heatsink and is specified to handle 2500Vrms (that's 3500V peak) short term overload; /archives//html/Amps/2008-09/msg00042.html (7,081 bytes)
19. Re: [Amps] Help with ARRL handbook design 4CX1000A 2m PA (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Wed, 23 Jul 2008 07:22:55 +0100; On the face of it, the anode load impedance is too low. Screen current can be an indicator of loading - what's that running at, and how does it vary as you wind up the drive power? Steve ____________; /archives//html/Amps/2008-07/msg00204.html (8,293 bytes)
20. Re: [Amps] Silver Strap (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Fri, 11 Jul 2008 08:04:43 +0100; Many years ago there was an article in RF Design magazine that looked at this - the analysis was that if the tarnished surface is higher resistivity than the underlying metal, than the current tends; /archives//html/Amps/2008-07/msg00103.html (8,508 bytes)

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