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Testing:  The DIYtransceiver front end
                receive and transmit circuits.
                *note* the  input into the laptop computer,
                      recording the transmit audio as received on
                      another radio out of view. Transmitting on
                      the IF frequency of 4.1936 MHz. using every
                      jumper cable in the shack. Case for radio is
                      top row to the right of the oscilloscopes,
                      it was an old 286 IBM clone.  Microphone is
                      homebrewed from an old scrap unit.