I've had an Astron power supply for years, marketed under the name
"Westcom." It's an RS-35A. At one time, all my equipment was close to
my tower, which I shunt-fed for 160 m and when I used 160 m, the
power supply had all sorts of problems. I removed the original
regulator board and replaced it with an "RFI-proof" regulator out of
the ARRL Handbook. The PC board is available from FAR circuits (I
doubt that it's still available as this was a long time ago). After
doing that, I never had another problem even at high power (which was
only about 700 W). I concluded that the regulator board was simply
prone to RFI and I'd guess that this is the problem you're experiencing.
Unfortunately, you'll probably have to experiment quite a bit to find the fix.
Kim Elmore, N5OP
At 08:26 AM 11/5/2006, you wrote:
I seem to recall some users reporting problems with Astron PS's and tentec
gear (though for the life of me, I can't recall the details). I'm having a
problem in that using a 50A Astron (new filter cap) results in a raspy CW
sidetone note... sounds like 60hz but I cant be sure. It happens only when
on higher powers (>60watts) on all antennas (including dummy load) on all
coax, etc etc.
When I switch to a different supply (in this case, another Astron as bench
supply) all is well. The Omni VI that sits next to the Paragon on the
operating table has no issues. Swapping all cables with the perfectly
working Omni results in no change...Omni stays good, Para bad.
The Para has just made a round trip to Tentec and has a clean bill of health.
The Para and omni is being fed through identical TT magnetic breakers.
Ideas? I'm stumped. I've got other supplies to use, but there should be no
reason for this!
John K5MO
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