To set the IC-2800H into cross band repeater mode:
Press and hold "CHG/L" button while holding both VHF and UHF "MAIN" buttons.
When the key lock indicator starts to blink the unit is in cross band
repeat.

To set the hang up time to 0 on cross band repeat mode, press and hold
"CHG/L" button while holding UHF "MAIN" button and bottom key on VHF side.
When the key lock indicator blinks the unit is set to 0 hang up time.

Michael Anderson

michael.anderson
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Another reader writes:

This will increase your rx frequencies to 320-530 mhz on the icom 2800 H mobile radio

1. remove cover
2.locate main processer,lower part of mainboard ,
  just to the right is a diode marked w13
3. cut the jumper marked w13
4. enjoy the full coverage

This is from Icom , and worked real well on my radio ,now I have extended
receive for listining to local police and U.S Air Force aircraft operation
on am.