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1. Re: [Amps] little OT, but here goes . . . (score: 1): Author: John F Wilson <amps@grebe.plus.com>; Date: Mon, 23 Jun 2008 23:35:44 +0100; Bringing it back on topic; "You know when your amp is big enough when the street lamps dim on key down or they get brighter due to the RF" John G3UUT _______________________________________________ A; /archives//html/Amps/2008-06/msg00196.html (8,781 bytes)
2. Re: [Amps] [Moon-net] Major breakthrough with regenerative yagi. (score: 1): Author: John Wilson <amps@grebe.plus.com>; Date: Wed, 20 May 2009 19:02:13 +0100; When I got the radio bug at about age 12 and had received my first 2m signals on a dipole and a super regen receiver, I learned from my school physics that water had a dielectric constant of about 80; /archives//html/Amps/2009-05/msg00134.html (12,283 bytes)
3. Re: [Amps] HV switch-mode power supply (score: 1): Author: John Wilson <amps@grebe.plus.com>; Date: Sat, 23 May 2009 17:05:03 +0100; All, Here's my take on this, particularly from a VHF contests point of view. We need good HV SMPS because; 1. Must be lighter, and hopefully smaller and more efficient than equivalent linear supplies; /archives//html/Amps/2009-05/msg00168.html (12,218 bytes)
4. Re: [Amps] A tale of two IMs What happens? (score: 1): Author: John Wilson <amps@grebe.plus.com>; Date: Sun, 18 Apr 2010 19:20:22 +0100; A simple way of looking at this problem is to consult an oracle and work out the combined third order intercept point (IP3) of the two (or more) stages. The equation for the ip3 of two cascaded stage; /archives//html/Amps/2010-04/msg00541.html (14,443 bytes)
5. Re: [Amps] Cleaning air-wound coils (score: 1): Author: John Wilson <amps@grebe.plus.com>; Date: Wed, 05 May 2010 15:07:35 +0100; Has anyone done any tests on the comparative Q between Silver plated, enamelled and tinned wire coils? I've always felt that factory enamelled wire stood a much better chance of retaining a good Q fo; /archives//html/Amps/2010-05/msg00058.html (9,977 bytes)
6. Re: [Amps] Sourcing Sheet Aluminum and Antenna tubing (score: 1): Author: John Wilson <amps@grebe.plus.com>; Date: Wed, 15 Sep 2010 23:31:06 +0100; In the UK Smith's metals (www.smithmetal.com), although really a wholesaler, will also supply relatively small quantities of Ally to credit card buyers. They do have 1/2 inch 18 SWG (Imperial) drawn; /archives//html/Amps/2010-09/msg00195.html (13,619 bytes)
7. Re: [Amps] Sourcing Sheet Aluminum and Antenna tubing (score: 1): Author: John Wilson <amps@grebe.plus.com>; Date: Thu, 16 Sep 2010 09:18:02 +0100; _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2010-09/msg00203.html (10,291 bytes)
8. Re: [Amps] Sourcing Sheet Aluminum and Antenna tubing (score: 1): Author: John Wilson <amps@grebe.plus.com>; Date: Thu, 16 Sep 2010 09:35:06 +0100; John, you shouldn't have told me that, you'll be up against bigger antennas on 6m next year as they seem to have 1/2" 18 SWG at a good price and are within reasonable distance from me to collect. 73; /archives//html/Amps/2010-09/msg00204.html (12,160 bytes)
9. Re: [Amps] Transformer-LESS advice (score: 1): Author: G3UUT <amps@grebe.plus.com>; Date: Mon, 17 Jan 2011 16:01:43 +0000; On the subject of switched mode HV psus, I've just come across the following which may be of interest, especially if anybody has any information on the (probably custom) control IC. http://www.vk3hz.; /archives//html/Amps/2011-01/msg00169.html (9,018 bytes)
10. Re: [Amps] variable capacitors (score: 1): Author: G3UUT <amps@grebe.plus.com>; Date: Tue, 25 Jan 2011 10:25:13 +0000; Paul, Try Jackson bros. http://www.mainlinegroup.co.uk/jacksonbrothers/index.htm John G3UUT _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesti; /archives//html/Amps/2011-01/msg00260.html (7,580 bytes)
11. Re: [Amps] Airflow meter (score: 1): Author: John G3UUT <amps@grebe.plus.com>; Date: Wed, 13 Apr 2011 17:24:05 +0100; Well that's a relief! I was planning on spending the weekend messing around with bin liners and water butts. It looks like these things are available real cheap on Ebay. 73 John G3UUT _______________; /archives//html/Amps/2011-04/msg00370.html (13,176 bytes)
12. Re: [Amps] Airflow meter (score: 1): Author: John G3UUT <amps@grebe.plus.com>; Date: Wed, 13 Apr 2011 19:17:17 +0100; Two good points, but I think you could probably solve both of them by simply using two flow meters with judicious use of cardboard so that half the air goes through each one. John G3UUT _____________; /archives//html/Amps/2011-04/msg00375.html (14,438 bytes)
13. Re: [Amps] T/R relays for 2M (score: 1): Author: John G3UUT <amps@grebe.plus.com>; Date: Fri, 03 Jun 2011 13:14:19 +0100; Beware of trying to speed up coax relays by putting an initial over voltage on them. I tried this with a 26 V Radial relay, I put a DC voltage on the contacts and observed the result on a scope. It d; /archives//html/Amps/2011-06/msg00018.html (9,595 bytes)
14. Re: [Amps] Should a blower run after amp shutdown? (score: 1): Author: John G3UUT <amps@grebe.plus.com>; Date: Fri, 03 Jun 2011 13:25:47 +0100; Another caution, this time about constant voltage transformers. I had one of these and tried to use it to stabilise the mains to a signal generator to improve drift. It sort of worked but the main pr; /archives//html/Amps/2011-06/msg00019.html (15,563 bytes)
15. Re: [Amps] AC filament voltage regulator (score: 1): Author: John G3UUT <amps@grebe.plus.com>; Date: Sun, 10 Jul 2011 10:12:09 +0100; I've also been thinking about this problem and the reason I'm not keen on a DC regulator is that the distortion and peak current of the mains current waveform is already pretty bad with a capacitor i; /archives//html/Amps/2011-07/msg00090.html (9,033 bytes)
16. Re: [Amps] AC filament voltage regulator (score: 1): Author: John G3UUT <amps@grebe.plus.com>; Date: Sun, 10 Jul 2011 12:31:22 +0100; Interesting idea using an opto-coupler but I think it would be too non-linear to give you a good RMS response especially on low heater voltages where the turn on threshold of the infrared LED is a si; /archives//html/Amps/2011-07/msg00093.html (12,519 bytes)
17. Re: [Amps] Transformer material weight (score: 1): Author: John G3UUT <amps@grebe.plus.com>; Date: Fri, 16 Sep 2011 14:48:27 +0100; Manfred, Thanks, for your excellent review of transformer design. Coming down to a more practical problem that has bugged me in the past when I've tried to rewind the secondary of a transformer is ho; /archives//html/Amps/2011-09/msg00115.html (16,611 bytes)
18. Re: [Amps] MOX resistors (score: 1): Author: John G3UUT <amps@grebe.plus.com>; Date: Sat, 19 Nov 2011 18:46:11 +0000; John, I bought some 100 K 3W 5% (Vishay PR03 series) from RS components recently RS part no 683-5922. I had hoped that a series of resistors next to each other on a bandoleer would be close in value,; /archives//html/Amps/2011-11/msg00080.html (8,572 bytes)
19. Re: [Amps] HV Insulators (score: 1): Author: John G3UUT <amps@grebe.plus.com>; Date: Tue, 16 Oct 2012 08:54:51 +0100; Henry radio have 3, 1.25 and 1 inch long ceramic stand offs - see their shop on epay or the web. John Le 15.10.2012 20:35, Roger (K8RI) a écrit : On 10/14/2012 7:23 PM, George wrote: I need to replac; /archives//html/Amps/2012-10/msg00096.html (9,123 bytes)
20. Re: [Amps] Power factor correction on tube amps (score: 1): Author: amps@grebe.plus.com; Date: Thu, 07 Mar 2013 17:18:04 +0000; Hi Peter, I had a feeling that the EU regs meant that any switching PSU over 100 W had to be power factor corrected. Does this also apply to non switching PSUs such as in tube amps, Ameritron, Alpha; /archives//html/Amps/2013-03/msg00080.html (9,337 bytes)

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