RPTDOC12                                            12/15/93
                     TEN CHANNEL MIXER INFORMATION.

        1. BE ADVISED THAT IN ORDER TO USE THE MIXER CARD WITH
           THE WB6JHQ CONTROLLER YOU MUST REPLACE TRANSISTORS T6 AND
           T7 WITH THE 2N3904'S PROVIDED WITH THE MIXER.  ALSO YOU MUST
           ADD THE 10 MFD. CAPACITOR FROM THE BASE OF T5 TO GROUND IF
           YOU ARE DRIVING A RELAY FROM T5.

        2. FREQUENCY RESPONSE OF THE MIXER IS FLAT FROM 400 HZ TO
           GREATER THAN 10 KHZ.

                IN ORDER TO MAKE THE MOST VERSITAL MIXER FOR RADIO USE
           THE CIRCUIT HAS ENOUGH GAIN TO DRIVE THE OP-AMPS INTO SATURATION.
           USE THE LOWEST GAIN SETTING POSSIBLE ON THE INPUT POTS
           AND THE MIXER GAIN POT AND CHECK WAVEFORMS WITH A SCOPE.

        3. IF YOU ARE USING MULTIPLE MIXER BOARDS ONLY THE LAST BOARD
           ON THE SERIAL INTERFACE SHOULD HAVE R13 INSTALLED. (620 OHMS)