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  1. By Rich Bono, NM1D for AutoLog.
  2.  
  3.  
  4.     Here is a simple schematic of a RS-232 to ICOM CI-V adapter that
  5. you can build yourself.  If you do not want to build your own, ICOM sells
  6. an accessory that does this for about $90.00.
  7.  
  8.  
  9.                    1N4001             +-------+
  10.     +12 ------------|>|----+----+-----| 78L05 |-----+--------+
  11.                            | +  |  in +-------+ out |        |
  12.    Gnd  ---+              ---  ---        |gnd      | +      |
  13.            |        22 uf ---  --- .05uf  |        --- 22uf  |
  14.            |        16 v   |    |       ----       --- 16v   |
  15.          ----              |    |      / / /        |        |
  16.         / / /            ----  ----                 |        |
  17.                         / / / / / /                ----      |
  18.                                                   / / /      |
  19.                                                              |
  20.                                                              |
  21.                                                              |
  22.                         22uf +   1 +--------+16              |
  23.                    +-----| |-------| MAX232 |----------------+
  24.                    |         +   2 |        |15
  25.            +---+-- | ----| |-------|        |-------------------------+
  26.            |   |   |      22uf   3 |        |14                       |
  27.          ----  |   +---------------|        |-----                   ----
  28.         / / /  |             +   4 |        |13                     / / /
  29.                |     +---| |-------|        |-----
  30.                |     |     22uf  5 |        |12
  31.                |     +-------------|        |-----
  32.                |        22uf +   6 |        |11
  33.                +---------| |-------|        |-----
  34.                                  7 |        |10
  35.     3  ----------------------------|        |--------+            To Remote
  36.                                  8 |        |9       |            Jack (CI-V)
  37.     2  ----------------------------|        |--------+--------------> (Tip)
  38.                                    +--------+                       
  39.     4  ----+                                                 +------> (Ring)
  40.            |                                                 |
  41.     5  ----+                                               ----
  42.                                                           / / /
  43.     6  ----+  
  44.            |  
  45.     7  ------------+
  46.            |       |
  47.     8  ----+     ----
  48.            |    / / /
  49.    20  ----+
  50.  
  51.  DB-25 (Female RS-232 connector)
  52.  
  53.  
  54.     Parts list:
  55.  
  56.     qty    Description
  57.  
  58.     1    MAXIM MAX-232 (RS-232 to TTL level converter)
  59.     1    78L05 (low power 5 volt regulator
  60.     1    1N4001 (diode)
  61.     6    22 uf at 16V capacitors
  62.     1    .05uf at 16V
  63.     1    DB-25 (Female RS-232 connector)
  64.     1    Mini phone plug (to connect to ICOM Remote jack)
  65.  
  66.   Please pardon the crude schematic!
  67.