[MRCA] URC-4

[Robert Newberry]

OK well one just makes a tone when I hit the RX button. The PTT doesn't
seem to do anything other than draw a 1/4 of an amp.

The other one does make static, it also draws the same amount of current on
TX. I have a 121.5 xtal installed. So I guess these are going to require
some more digging before I can make a signal.
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