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: drakelist@zerobeat.net 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 ------------------------------------------------------------------------------ _______________________________________________ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
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