Hi,
I use an Astron RS35 with my tr7 and have none of the problems you spoke of. I
get no dimming at all during key down or otherwise.
The Tr7 does require more current than most all of the Japanese radios. It
could be your Astron has a problem you would otherwise not be aware of except
with the tr7.
Good Luck
David
----- Original Message -----
From: James Cobb
To: [email protected]
Sent: Monday, February 16, 2009 12:24 PM
Subject: [Drakelist] TR-7 Power Supply Question
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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