Jerry,
Thanks again for the advise. You called it. Radio back on frequency
(compared to another radio), and hum gone. When I did the resistor change
for a heil mic, I must not have tightened the mounting screws enough and
when working with the interface connector, it developed a ground problem.
73's
David
Wd9cmd
----- Original Message -----
From: "Dr. Gerald N. Johnson" <geraldj@weather.net>
To: <tentec@contesting.com>
Sent: Wednesday, July 15, 2009 10:05 AM
Subject: Re: [TenTec] Omni VI problems
On Wed, 2009-07-15 at 09:00 -0400, David & Chris Drake wrote:
Thanks Ron,
Yes, unhooking the serial cable made no difference. When I found out
there
was a hum in my audio, I methodically began unhooking things in the shack
one by one. First was the serial cable. I even went to the breaker
panel
and shut down the rest of the house !!. Finally unhooked the 961 and
substituted the astron RS 35. Same thing. So it seems to be the radio.
David
Lift the lid. Tighten all the board mounting screws. Check the
microphone cable. See if it happens with the microphone disconnected.
Just yesterday someone noted they found their hum came from a broken
braid on the microphone cable. It might be that the act of connecting
the RS-232 cable moved a loose board and broke a ground connection. Look
for that.
73, Jerry, K0CQ
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