


                                                                    1000
                               5k                            (tip)  ohm
                >---- ------/\/\/\/\-----            -------------> output
                     |                   |           |   |   |
      input          >             5k    >    .33u   |   >   |   (to radio)
             600 ohm >          trimpot  ><----| |---|   ><---
 (from two           >                   >               >  50k trimpot
  center pins   >____|___________________|__________     |
  on modular                                 |      |    |
  connector)                                 |      V    V
                                            ___     ptt sw.
                                            ///
                                              (sleeve)
    -adjust 5k pot for audio level, and the 50k pot for good ptt action

       INTERFACE FROM MODEM TO ICOM HANDHELD
                                            by VE5AG, Jan 7/93



