MICROSCAN INTERFACE
===================

DEMODULATOR
===========
                                                  RS-232 PC

                                                  (25p) (9p)
                                     /
                               Ĵ<  DTR (20)  (4)
                                    \
                             \
             100n         3 \7   1N4148
 audio ĴĴ  \ 6
    in                   741> DSR (6)   (6)
                    Ĵ  /
                        2 /4   1N4148
                     /
                           \ 
           10n             Ĵ > RTS (4)   (7)
                               / 
                 100k 
ground  GND (7)   (5)


PTT-CIRCUIT
===========

   PTT Ŀ
                         1k          1N4148
                   \   Ŀ    /
                    Ĵ     Ĵ<  RTS (4)   (7)
                   /       \
                  
                   BC547B
ground 


MODULATOR
=========

           100n   2k2         2k2
              Ŀ     Ŀ
speaker ĴĴ     Ĵ     Ŀ
  pc                        1k
                                          
                                   
                                   < mic input
                                           
           100n           100n        100n
                                         
speaker Ĵ ground
  pc             
                   
                   
ground  
  pc                                         All C's ceramic
(chassis)