Mike,
I have a similar problem with an OMNI D and have replaced 4 bad diodes on
the SWR/TR board, which has restored my ALC circuit or so it seems. But,
after the radio is used for a time, and gets warmed up, it starts to warble
or chirp both on receive and transmit. I read about the diodes on the PA
board, but I'm not certain looking at my manual, which board you are
referring to, and I am not certain that this stability problem is related
anyway, but it does seem like an amp that is oscillating based on the noise
in the receiver as well as the chirpy CW tones on receive and transmit. The
frequency display even moves around a bit. The power supply seems to be
fine.
I've got the soldering iron plugged it, so if you have an idea about this
I'll see what I can melt down. HI
Ron
KA7U
-----Original Message-----
From: tentec-bounces@contesting.com [mailto:tentec-bounces@contesting.com]On
Behalf Of Mike Hyder -N4NT-
Sent: Monday, July 25, 2005 1:00 PM
To: Ten-Tec Reflector
Subject: [TenTec] Fw: Troubleshooting an OMNI D
Forwarded per request...
Mike N4NT
----- Original Message -----
From: "Mike Hyder -N4NT-" <n4nt_m_o_hyder@charter.net>
To: "Patti" <pthielking@earthlink.net>
Sent: Monday, July 25, 2005 3:59 PM
Subject: Re: [TenTec] Troubleshooting an OMNI D
Hi, Eric--
There are two diodes on the PA board, I think, that generate the ALC
voltage. Without that voltage, the PA will often go into oscillation.
These diodes are probably bad and need to be replaced.
While in there, I suggest replacing the two diodes that generate the SWR
voltage. That makes four diodes but for some reason I think there may be
five that you can replace while in there. Anyway, diodes are cheap so get
them all at one time!
73, Mike N4NT
----- Original Message -----
From: "Patti" <pthielking@earthlink.net>
To: <tentec@contesting.com>
Sent: Monday, July 25, 2005 1:45 PM
Subject: [TenTec] Troubleshooting an OMNI D
I am looking for some hint's regarding a lack of ALC operation on an OMNI D.
Anyone willing to help, can contact me off-list.
Thanks
Eric Thielking
ewthielking@yahoo.com
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