Icom IC-551 (IC 551 IC551) transceiver mods reviews software and diagrams

   
 
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20 November 2024, 2:32 UTC 


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Icom IC-551 (IC 551 IC551)
IC-551
Programming interface schematics for Icom:
Programming software for Icom IC-551 (IC 551 IC551) :
PDF User Manual for Icom IC-551 (IC 551 IC551) :
PDF Service Manual with schematics for Icom IC-551 (IC 551 IC551) :

Mods for Icom IC-551 (IC 551 IC551) :
    Icom IC-551 (IC 551 IC551) Frequency Alignment
    Icom IC-551 (IC 551 IC551) EX-107 VOX UNIT -- Installation
    Icom IC-551 (IC 551 IC551) EX-108 P.B. TUNE UNIT -- Installation

Icom IC-551 (IC 551 IC551) technical specifications :  Icom IC-551 (IC 551 IC551) technical specifications



Icom IC-551 (IC 551 IC551) EX-107 VOX UNIT -- Installation

The VOX unit mounts to the lower mounting plate.
See instructions for EX-106 and page 29 of your manual.
  1. Mount the EX-107 on the lower mounting plate. Mount with the cable toward the centerline of the radio. Secure with 4 screws.

  2. Route the cable behind the front panel to the top of the main circuit board. Connect the plug to J4 after removing the jumper plug installed at this location.

  3. Reinstall upper mounting plate and top & bottom covers.

  4. Adjust VOX gain, ANTI VOX, and VOX delay for proper operation.

  5. VOX will work on CW as break-in. There is a delay line in the VOX to allow full transmit operation before the first syllable is transmitted and to prevent chirp on the first CW character.