[Amps] High frequency heater supplies

W7RY w7ry at centurytel.net
Fri Jul 14 11:29:52 EDT 2006


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. This causes lots of interference. Although the
spurs are low, (40-50dB down), they are still a problem when you are
trying to receive close to an affected transmitter.

After replacing the switching supply with a linear regulation supply
(Astron) the problems go away.

I wonder how many problems that switching power supplies are causing on
the HF bands?

73
Jim W7RY


-----Original Message-----
From: amps-bounces at contesting.com [mailto:amps-bounces at contesting.com]
On Behalf Of Steve Thompson
Sent: Thursday, July 13, 2006 7:38 AM
To: amps at contesting.com
Subject: [Amps] High frequency heater supplies

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
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