Gents,
I'm trying to decide what I should do for a power supply for my TR-7. I'll
try to give the Reader's Digest version, but I have a slight complication. My
main power supply is an Astron RS-35M, but my TR-7 (S/N 46xx) generates some
transmitted audio feedback in the receive audio when used with the RS-35M.
I've used 3 other HF radios on the Astron and none of them have glitched and a
full alignment on the TR-7 didn't cure the problem either. A few weeks ago, I
tried running the high-current power lead off the Astron and the low-current
lead from an MFJ-4125 switcher and the transmitted audio feedback totally
disappeared. When using only the Astron, I was also getting some dimming of
the panel lights which does not happen with the other radios. My guess is that
my Astron has a slight issue. The MFJ-4125 doesn't provide enough current to
run the whole radio which brings me to needing to do something about the power
supply setup.
(Note: G4ALG had posted some notes on a similar problem that got me to
looking at this issue and his notes led me to run separate power lines for the
high-current and low-current connections that fixed his problem and my problem.)
So, for long-term use, I've been considering either getting a PS-7 or getting a
dedicated high-current supply. I noticed yesterday that W4LGH is using a
Jetstream 45A switcher to run his TR-7 (and whole shack, for that matter).
I've heard that the PS-7 is built like a tank, but I'm wondering if it would be
wiser in the long run to buy something like the 45A switcher that I could use
for many purposes instead of getting a PS-7 that is dedicated to the TR-7.
So, I'm looking for inputs here. I seem to be split 50-50. Sometimes, I think
I should just get a PS-7 and be done with it. Other times, I think a new
high-current unit would be fine and give me other options down the road. What
say you?
Thanks and 73,
Dave / K8JDC
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