I recently purchased a new Astron SS-30M switcher and the fan is extremely
quite, unlike a SS-30M I purchased new about 10~12 years ago.
Donnie / WA9TGT
On Sep 4, 2012 8:42 AM, "Chuck N4XS" <chuck@n4xs.com> wrote:
> There seem to be pros and cons to every power supply choice. The linear
> supplies are not very efficient, and use a lot of power just idling,
> particularly the big ones. Switching supplies are more efficient but can
> add
> RF noise. I generally get along fine with switchers, but the most annoying
> noise for me is fan noise. I bought an MFJ 75-amp supply with lots of nice
> features but the fan is much too loud and runs all the time. I considered
> relocating it to the other side of the wall or building a soundproof
> enclosure so I wouldn't have to listen to it. Someday I may look for a
> quieter replacement fan. I have an Icom switcher with a quieter fan, but it
> cycles on and off, and even though I am half deaf, it still bothers me.
> Right now I am using an Alinco DM-330 which is pretty quiet and efficient.
> I
> don't notice any bothersome RF noise from it, but I do have lots of toroids
> on my AC power lines, DC station wiring, and antenna cables.
>
>
>
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