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

[Barry]

> Sorry for the OT post, but I looked in the CB newsgroup and it is truly a
> cesspool.  I'd rather not post there.
>
> I have a yard-sale CB walkie-talkie that my mom gave me several years ago.
> I thought it had major problems, but I discovered last night that the
> internal speaker/mic isn't working.  It works (kind of) with an external
> speaker connected and I still need to see if it modulates with an external
> microphone.
>
> The question I have is if there is anything special about the speaker
> design in this thing?  Is it likely that the internal speaker is just an
> ordinary speaker and it is supposed to function (probably poorly) as a
> microphone as well or is the speaker specially designed to handle
> microphone duty as well?
>
> I'm hoping the speaker isn't really shot but that it might just be
> connections gone bad, but I may end up having to replace it to get this
> thing working again.  No, I don't really intend to get on the CB bands and
> do anything with it beyond testing it.  I just like to tinker with things
> like this.
>
> It's a Lafayette Dyna-Com 23 with the owner's manual copyrighted in 1976.
> It's a pretty ruggedly made unit and I don't want to trash it (nice, long
> sturdy internal antenna).  Any help with the speaker/mic issue would be
> greatly appreciated.
>
> Thanks,
>
> Barry - N4BUQ

The speaker is 2-3/4" diameter, 100-ohms.  Anyone know where I might find
one?  I've found 2-1/4", 100-ohm and 2-3/4", 8-ohm (would probably work well
enough but...), but not the right combination so far.

Thanks,

Barry - N4BUQ