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dave · February 15th 10, 03:35 PM posted to rec.radio.shortwave

wrote:
On Feb 14, 5:32 pm, wrote:
bpnjensen wrote:

Is it safe, then, to assume that a combination of draws that total
somewhat less than the lower rating would not put undue stress on the
supply? (FWIW, I'm still thinking the Astron 7/5 amp supply for my ~
2.5 amp max needs, or if I feel unsure, the Astron 12/9). Might even
throw a muffin fan on the back.

Gentlemen, thanks for all your great help!

Bruce

I run a 12 Watt radio (K3/10), my LDG Z-100 tuner, and a 45 Watt amp
(Tokyo Hy-Power HL45B) on an Astron SS-12. The thing never even gets warm.

From Astron website I conclude: SS-XX series are switching
power supplies. Great for heavy loads, usually stay cool,but... not
perfect enough for me. They generate RF,even the better ones. The
ones that were designed for the so-called 'TEMPEST' program probably
exist, somewhere. Receivers designed with TEMPEST requirement must be
around as well. Somewhere. Otherwise,there is no readily available
substitute for a regulated linear power supply. This was recognized
long time ago.
My antenna is 30 feet away. The switch mode power supply noise is
well below what is ambient at that location.

Linear supplies waste energy. I can leave my switcher on all the time
and I don't have to worry that it is wasting energy.