[R-390] OT: Question re: speaker mic for walkie-talkie

[n4buq at knology.net]

> Shouldn't be anything special, Barry.  Try any small speaker that will 
fit.
> You actually have one of the finest CB band* receivers ever made for
> monitoring.
> In fact, you probably have 3 or 4 of them, some in the project queue...
> 
> 
> 
> 
> 
> *That's the 11 meter ham band to us oldtimers.
> 
> Don


The little thing has push-pull audio but not sure of the impedence of the 
secondary on the output transformer.  I might get lucky and find it is 
marked on the speaker itself.

I'm not sure, but when I first got it, I may have accidentally hooked power 
up the power briefly with the polarity reversed.  I thought that might have 
fried a transistor, but either I was mistaken, I got lucky, or these little 
things are more tolerant that I would have thought.  I probably need to 
check on the electrolytics in the power input section, though.

Audio is rather crappy and I think it needs alignment; however, I was 
listening to the same frequencies on one of my other radios and I think the 
crappy sounding audio is more on the transmitter's side than on the 
receiver.  Overmodulating on the CB bands?  Never??  :)

Kind of cool in that it takes 10 AA batteries (12 if they're NiCads).  
Probably got a lot of battery time back in the day.

Thanks,

Barry - N4BUQ