No, it shouldn't be normal.
I had a PM-3A years ago that would oscillate like this on receive when the
dry cell batteries I was using got low. Don't know if it was due to the
lower voltage or the higher internal resistance of the battery.
Cured it by switching to a fresh battery. Before getting a new battery, I
was able to make the oscillation stop by putting an electrolytic capacitor
across +12V and Gnd.
Gary, W1PG
At 10:16 AM 7/28/2007 -0400, you wrote:
>I have a RX-10 that I am going through. A PO had installed nicads as a
>power source and they are over the hill. I was checking operation last
>night and heard signals on 20 & 40. The Tune control works but as I
>turn it towards the band of operation, it seems to cause an oscillation
>just at the point of peak signal strength. Is this normal?
>
>John / WA1JG
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