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Total 8 documents matching your query.

1. [Amps] High frequency heater supplies (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Thu, 13 Jul 2006 15:37:48 +0100; Does anyone know if there are problems using high frequency (say 30kHz) ac to run the heater in a valve with a cathode? For that matter, the filament in a valve without a cathode? Thanks, Steve _____; /archives//html/Amps/2006-07/msg00369.html (6,244 bytes)
2. Re: [Amps] High frequency heater supplies (score: 1): Author: "Jim Tonne" <tonne@comcast.net>; Date: Thu, 13 Jul 2006 11:36:19 -0400; If line-frequency (50 Hz or 60 Hz) power can cause a small amount of modulation of the RF output, then I would think 30 kHz could do the same thing. The output signal would then have sidebands at +/-; /archives//html/Amps/2006-07/msg00371.html (7,587 bytes)
3. Re: [Amps] High frequency heater supplies (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Thu, 13 Jul 2006 16:44:02 +0100; Yes, I had thought the same - 50/60Hz sidebands low down don't hurt anyone else, 30kHz away would. Any tiny imbalance in the heater feed would do that. Just to be clear, given variations in terminolo; /archives//html/Amps/2006-07/msg00372.html (7,712 bytes)
4. Re: [Amps] High frequency heater supplies (score: 1): Author: Tony King - W4ZT <amps080605@w4zt.com>; Date: Thu, 13 Jul 2006 13:40:16 -0400; Steve, We have experienced problems with indirectly heated cathodes which are INTERNALLY connected to the filament like the GS-35B and the GI-7B such that the output was modulated with hum from the f; /archives//html/Amps/2006-07/msg00374.html (8,686 bytes)
5. Re: [Amps] High frequency heater supplies (score: 1): Author: "Val" <val@vip.bg>; Date: Fri, 14 Jul 2006 08:45:01 +0300; This probably is connected with the possibility of using switching mode power supply on the filament xmfr's place. There are a lot of such transformers manufactured for feeding 12 volt halogen bulbs; /archives//html/Amps/2006-07/msg00377.html (7,943 bytes)
6. Re: [Amps] High frequency heater supplies (score: 1): Author: "W7RY" <w7ry@centurytel.net>; Date: Fri, 14 Jul 2006 08:29:52 -0700; We have been finding issues using switching power supplies on commercial 2-way radio base stations and repeaters. The spurs are spread up and down the band at the intervals of the switching frequency; /archives//html/Amps/2006-07/msg00379.html (8,386 bytes)
7. Re: [Amps] High frequency heater supplies (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Fri, 14 Jul 2006 18:38:53 +0100; I'd echo Jim (K9YC)'s comments about mechanisms. In Europe, all spurious has to be -36dBm; 80dB down at 25W and 86dB at 100W. That demands a particular mindset, and often requires linear rather than; /archives//html/Amps/2006-07/msg00381.html (8,475 bytes)
8. Re: [Amps] High frequency heater supplies (score: 1): Author: "m.ford" <k1ern@pioneerwireless.net>; Date: Fri, 14 Jul 2006 14:12:51 -0400; Hi Jim, I just tossed the one that came with my Alvarion Breeze ACCESS 900 mhz wireless internet transciever. A 5 volt dc , 2 amp wall wart with a 3 prong plug. It was S9 50 feet away from the shack; /archives//html/Amps/2006-07/msg00384.html (10,864 bytes)

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