ts790.4

                   TX AUDIO ADJUSTMENT

  The audio gain can be adjusted by variable resistor VR36 on the IF unit.
  If the range of VR36 does not suffice for normal transmit audio,the
  values of the resistors on the 13 pin din plug can be changed.
  as an example,if the audio is too low,reduce the value of the 100K ohm
  resistor and increase the value of the 1.5K ohm resistor.

                 TO ACCESS VR36

  1 Remove the bottom cover of the radio to expose the IF unit.
  2 locate VR36
  3 Use a plastic alignment tool to adjust VR36 for the bottom cover.

   73 AND HAPPY MODING
   CARL
   packet: VE3ZCO@VE3GYQ BBS

Note: I haven't tried or verified this, proceed at your own risk. WA2ISE