I have 2 of the SS-30M and have never seen this problem (fan noise).
They are very quiet whether the fan is running or not. I like the "M"
version with meters. They are powering 3 radios including the K-3 and 2
brick amps. I find it helpful to have the ammeters. For example, this
past weekend I had a feedline connector problem which resulted in the
brick dropping power output. It was immediately apparent via the ammeter
that there was a problem. The only issue I've had was a failed rocker
switch which was easily replaced since it snapped in and the wiring used
Faston terminals. The older one I've been running for 12 years now and
going strong!
73,
Josh W6XU
On 6/13/2013 2:49 PM, Richard Fjeld wrote:
People have mentioned the Astron SS-30A switcher. I have one and noticed when
the fan came on, I could hear a high pitched squeal in the audio. Also on Tx.
I read other reports of this. Some people put ferrites on the fan wires. If I
remember correctly, I re-heated the solder joints on the fan wires. Problem
solved. I like the supply because of it's small size and light weight. I use
it when portable.
Dick, n0ce
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