N8KDV wrote:

Maximus wrote:

I have a Radio Shack PRO 2952 with a very irritating problem: after being on
for a while, it starts to go into an acoutical feedback loop. The only thing
I can do is turn the volume down, but I have to turn it down to the point
where I can barely hear it - or else turn it off for a while.

I thought maybe it was a problem with overheating, but I don't understand
the feedback problem. Any ideas what's causing this or how to fix it ? TIA
Maximus.

V

I wish I could help! However I know nothing about that model, or even what it
is.

To be honest, I'm not terribly good at technical stuff. Basics yes, but when it
gets right down to it, I'm lost!

My Chief in the Navy told me I was lost too... ! But at least back then we had
good old vacumn tube stuff still in the fleet and it was a bit easier.

Is that a scanner by chance? If so, you might try rec.radio.scanner.

Thanks for asking though!

Steve



I'm the same as Steve with electronics: Basics, yes. In-depth
technical, no. I can tell you this much:


Any speaker can be used as a microphone. And small speakers work
best (because they have smaller cone mass, and it's easier to vibrate
them). In older building "intercom" systems (a paging point in one
place, speakers in every room), when you "answer" a page by speaking
back toward the "speaker", the speaker in the little box on the wall (or
ceiling) is being used as the microphone. That type of system is
designed for that (schools and hospitals all have them). On your radio,
that is NOT supposed to happen. Why is it? I don't know, but I can
tell you that it is related to some component on the radio's circuit
board that only begins to "bugger up" when it's fully warm. I once
owned a TV set like that - fine when you turned it on, a thick black
line at the bottom of the screen when it warmed up. Fixable?
Probably. Worth it? ?????

Tony


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