Icom IC-820H (IC 820 H IC820H) transceiver mods reviews software and diagrams
   
 
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04 November 2025, 5:16 UTC 


Transceivers
Motorola

Icom IC-820H (IC 820 H IC820H)
IC-820H
Programming interface schematics for Icom:
Programming software for Icom IC-820H (IC 820 H IC820H) :
PDF User Manual for Icom IC-820H (IC 820 H IC820H) :
PDF Service Manual with schematics for Icom IC-820H (IC 820 H IC820H) :

Mods for Icom IC-820H (IC 820 H IC820H) :
    Icom IC-820H (IC 820 H IC820H) Leistungsregelung
    Icom IC-820H (IC 820 H IC820H) extended receive/transmit modification
    Icom IC-820H (IC 820 H IC820H) cross band repeat modification
    Icom IC-820H (IC 820 H IC820H) display board
    Icom IC-820H (IC 820 H IC820H) Test results
    Icom IC-820H (IC 820 H IC820H) 1750Hz on IC-820, modif

Icom IC-820H (IC 820 H IC820H) technical specifications :  Icom IC-820H (IC 820 H IC820H) technical specifications



Icom IC-820H (IC 820 H IC820H) cross band repeat modification

Add a diode on the blank position between D27 & D28 on the Logic Board. The part is 1SS353 P/N 1750000390.

After hardware modification

  1. Set lock mode. Push [LOCK]

  2. Turn Power off.

  3. Hold [M/S] and turn radio on.

  4. Turn repeater off. Push [LOCK].

Note: If you removed Diode D25 or Diode D26 in the first modification then it can be used in the second modification as it is the same part.


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