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1. [Amps] Switching Power Supplies (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Fri, 14 Jul 2006 10:27:10 -0700; Interesting. To have an intelligent discussion of this, I think we need to understand that switchers can be made with any range of performance spec for RFI from very good to awful. Because I don't ha; /archives//html/Amps/2006-07/msg00380.html (8,933 bytes)
2. Re: [Amps] Switching Power Supplies (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Fri, 14 Jul 2006 13:52:16 -0400; The ICOM 751A generates FM trash when the internal switching supply is used. The problem is the VCO coil is next to the transformer in the switching supply module, and the magnetic flux changes perme; /archives//html/Amps/2006-07/msg00382.html (8,868 bytes)
3. Re: [Amps] Switching Power Supplies (score: 1): Author: Colin Lamb <k7fm@teleport.com>; Date: Fri, 14 Jul 2006 11:07:01 -0700 (GMT-07:00); "I can't imagine why an amateur would want to use a switching supply for a filament. What reason is there to do that?" There could be a few reasons: 1. The amp has to be transported and weight is an; /archives//html/Amps/2006-07/msg00383.html (8,044 bytes)
4. Re: [Amps] Switching Power Supplies (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Fri, 14 Jul 2006 19:31:00 +0100; Not this one - but it would apply to another one in the planning. No transformer in stock, but enough bits to build a switcher - so I get to learn something too. Not quite penniless, but certainly pa; /archives//html/Amps/2006-07/msg00385.html (7,879 bytes)
5. 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)
6. Re: [Amps] Switching Power Supplies (score: 1): Author: "Keith Dutson" <kdutson@sbcglobal.net>; Date: Fri, 14 Jul 2006 13:53:13 -0500; filament. What reason is there to do that? I can think of only one: lower travel weight for DXpedition use. 73, Keith NM5G _______________________________________________ Amps mailing list Amps@cont; /archives//html/Amps/2006-07/msg00387.html (8,049 bytes)
7. Re: [Amps] Switching Power Supplies (score: 1): Author: Tony King - W4ZT <amps080605@w4zt.com>; Date: Fri, 14 Jul 2006 14:56:43 -0400; Tom, The reason I chose a small switcher for my filament supply was to provide a stable DC filament voltage over changing input line voltages. The switcher I found was a fully shielded commercial var; /archives//html/Amps/2006-07/msg00388.html (9,367 bytes)
8. Re: [Amps] Switching Power Supplies (score: 1): Author: Joe Isabella <n3ji@yahoo.com>; Date: Fri, 14 Jul 2006 12:26:35 -0700 (PDT); Way to go, Steve!! Doing something successfully that others say shouldn't or can't be done is something I thrive on!!! Glad to see somebody else around here with that gene... Joe, N3JI Not this one -; /archives//html/Amps/2006-07/msg00390.html (8,997 bytes)
9. Re: [Amps] Switching Power Supplies (score: 1): Author: "Will Matney" <craxd1@verizon.net>; Date: Fri, 14 Jul 2006 15:29:02 -0400; Tony, What is the waveform coming out? Is it a square wave, or is it a modified sine wave (a stair steeped square wave that supposed to mimick a sine wave)? If it were me, I'd want the square wave, r; /archives//html/Amps/2006-07/msg00391.html (10,988 bytes)
10. Re: [Amps] Switching Power Supplies (score: 1): Author: Tony King - W4ZT <amps080605@w4zt.com>; Date: Fri, 14 Jul 2006 15:36:40 -0400; I think this was meant for Steve ;) _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2006-07/msg00392.html (10,944 bytes)
11. Re: [Amps] Switching Power Supplies (score: 1): Author: "David Lisney" <g0fvt@hotmail.com>; Date: Fri, 14 Jul 2006 20:51:02 +0100; We had some issues with a UHF PMR base station being "heard" 50KHz away, due to residual ripple from a switch-mode. No time for experiments with it so it just got it's power source shifted to a linea; /archives//html/Amps/2006-07/msg00393.html (8,304 bytes)
12. Re: [Amps] Switching Power Supplies (score: 1): Author: "Will Matney" <craxd1@verizon.net>; Date: Fri, 14 Jul 2006 16:28:09 -0400; Correct, I did mean Steve. Sorry about that. Best, Will ** REPLY SEPARATOR ** _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman; /archives//html/Amps/2006-07/msg00394.html (11,496 bytes)
13. Re: [Amps] Switching Power Supplies (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Fri, 14 Jul 2006 17:23:58 -0400; Filament or emission life is virtually never an issue for amateur service. All the worry comes from commercial applications, where the tube runs 24/ 7/ 52 weeks a year. In amateur service the primar; /archives//html/Amps/2006-07/msg00395.html (9,472 bytes)
14. Re: [Amps] Switching Power Supplies (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Fri, 14 Jul 2006 22:24:04 +0100; I'm aiming for a floating supply as the current project is a tetrode running with the screen at ground potential. I initially thought about a dc supply where the switching frequency can be filtered t; /archives//html/Amps/2006-07/msg00396.html (9,977 bytes)
15. Re: [Amps] Switching Power Supplies (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Fri, 14 Jul 2006 17:29:28 -0400; The filament transformer is typically about 5-10% of overall amplifier weight. On a 60 pound amp that's 3-6 pounds. If the switching supply cuts that in half, we save 1-1/2 to 3 pounds. I think the; /archives//html/Amps/2006-07/msg00397.html (9,118 bytes)
16. Re: [Amps] Switching Power Supplies (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Fri, 14 Jul 2006 18:51:44 -0400; How will a switching supply handle a HV to ground fault if the tube arcs? 73 Tom _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mai; /archives//html/Amps/2006-07/msg00398.html (9,145 bytes)
17. Re: [Amps] Switching Power Supplies (score: 1): Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>; Date: Sat, 15 Jul 2006 00:00:23 +0100; In Field Day use, with more than one station hooked up to the same generator, there can be violent swings in the line voltage as stations switch unpredictably between transmit and receive. A regulate; /archives//html/Amps/2006-07/msg00399.html (8,848 bytes)
18. Re: [Amps] Switching Power Supplies (score: 1): Author: "Will Matney" <craxd1@verizon.net>; Date: Fri, 14 Jul 2006 19:59:14 -0400; A transformer running at say 400 Hz would be approximately 1/8 to 1/4 the size of one at 60 Hz. Not only is it a weight savings, but the transformer itself will cost much less. Best, Will ** REPLY SE; /archives//html/Amps/2006-07/msg00400.html (10,395 bytes)
19. Re: [Amps] Switching Power Supplies (score: 1): Author: "wc6w@juno.com" <wc6w@juno.com>; Date: Sat, 15 Jul 2006 00:05:45 GMT; Hi Steve, A distinction should be made between heaters & filaments, and AC & DC output switchers. Just about anything may be employed to run a heater. AC, DC, phase controlled AC or a raw switcher ou; /archives//html/Amps/2006-07/msg00401.html (10,915 bytes)
20. Re: [Amps] Switching Power Supplies (score: 1): Author: "Will Matney" <craxd1@verizon.net>; Date: Fri, 14 Jul 2006 20:12:49 -0400; See Below; ** REPLY SEPARATOR ** I tee-totally agree. I would want the heater supply to be DC, and be regulated. Any fluctuations then will not affect the heater voltage. Running DC on a heater will; /archives//html/Amps/2006-07/msg00402.html (10,296 bytes)

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