This modification is to open the IC-820H for extended receive (and transmit) operation. This is a two (four) step modification which will open the IC-820H to the following frequencies:
VHF Band 136 - 174 MHz
UHF Band 420 - 460 MHz
These frequencies are not guaranteed for accuracy or sensitivity.
- Remove Diode D25 on logic board for VHF RX Expansion.
- Remove Diode D26 on logic board for UHF RX Expansion.
- Remove Diode D27 on logic board for VHF TX Expansion. *
- Remove Diode D28 on logic board for UHF TX Expansion. *
* RX modification must be done before the TX modification will work. *
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