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  1. ************ Acquired from CompuServe HAMNET Forum: *****************
  2.  
  3.  
  4.            COMPUTER INTERFACE CIRCUIT FOR CAT CONTROL (IBM GROUP)  
  5.  
  6.                           +9v to +12v (9v battery OK)
  7.                                         +| | -  Add DPST switch at X's
  8.  TO IBM/COMPATIBLE  ----------------O -X-||||--
  9.  |                  |               |    | |  _|_         TO RADIO
  10.                     |               <         ///    (Numbers shown are
  11.  232 CONNECTOR      |               <10 k            for 6 pin din conn. 
  12.  |                  |               <                for FT-980 only)
  13.                     |               |
  14. 1<----o--------------------------------------------o---------->(1) GND
  15. 7<----|             |               |              |
  16.                     |               |              |          |
  17.  |                  |/|2    100 k   |              |
  18.                    4/+|-----/\/\----|------------------------->(2) TTL
  19.  |                 /  |             |              |             SIGS
  20.         3.3 k   1 /   |             |              |          |  FROM
  21. 3<------/\/\-----/ U1A|             |              |             RADIO
  22.                  \    |             |              |          |
  23.  |                \   |             |      |\ |    |
  24.                    \  |3            |      | \|    |          |
  25.  |                  \-|-----/\/\----o------| /|----o
  26.                      \|     100 k          |/ |    |          |
  27.  |                                         1N914   |
  28.               -----\/\/-------      (Radio Shack   |          |
  29.  |            |     100 k    |       276-1122)     |
  30.               |  |\          |                     |          |
  31. 2<------/\/\--o--|-\         |                     |
  32.          18 k   6|  \        |              | /|   |          |
  33.  |               |   \ 7     |              |/ |   |
  34.                  |U1B \------o----/\/\------|\ |----------o--->(3) TTL
  35.                  |    /            47       | \|   |      |      SIGS
  36. 2                 |   /11                   1N914   |      |      TO
  37.                  |  /|                             |      |      RADIO
  38.             -----|+/ |   U1  LM324 Quad Op Amp     |      |
  39.             |   5|/  |   (Radio Shack 276-1711)    |    ------
  40.             |        |                             |      /\1N914
  41.             |        |  Build circuit on bread-    |     /  \ 
  42.             >        |  board(Radio Shk 276-175)   |     ----    
  43.             > 100 k  |                             |      |
  44.             >        |            - | | +          |      |
  45.             |        O --X---------||||---|        |      |
  46.            _|_         -9v to -12v  | |  _|_      _|_    _|_
  47.            ///         (9v battery OK)   ///      ///    ///
  48.  
  49.       For use with any interface activity. Schematic in Public Domain.
  50.    (For an FT-980 radio CAT control program download CAT980 or send
  51.                     $5.00 for disk. Specify disk size.)
  52.  
  53.             K5YEF/Art Harding/PO Box 861719/Plano, Tx. 75074/USA
  54.