maxjam_99 wrote:
>I have a vhf mitrek that has been split for repeater operation. It
>has work flawlessly until now. When the TX is unkeyed the transmitter
>will stay keyed for approx 10 seconds. During this time it generates
>a wide signal +-1Mhz centered on the TX frequency with full power out.
> Once 10 seconds or so it will unkey and cease tx'ing. If you key the
>TX during the time it is generating this wide signal then it will TX a
>proper clean signal, unkey and start over.
>
>Any thoughts?
>
If it is a ham repeater, take a heavy duty relay and place it in the B+
power line that feeds power to the PA. Use a sample of the PTT to key
the relay (a buffer circuit may need constructed). Your PA is becoming
unstable when there is no drive, and removing the B+ from it will
eliminate that.
If it is a commercial repeater, find out what is causing the
unstableness and correct the problem. It could be that RF power from a
nearby transmitter is getting back through the antenna connection; a
circulator or isolator will fix that.
Kevin Custer
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