Open the radio and place it face down with the BNC jack up, and locate two jumper wires

on the lower right hand corners of the set. The red jumper is for extended receive,

and the blue(I think it is blue?) jumper is for extended transmit.

Just cut/unsolder the red jumper for extended receive, blue for extended transmit,

or both jumpers if you want both.

Push the F button while turning the set on to reset radio to factory defaults. The extended

receive (AM aircraft) can be activated by pressing the B button on the keypad.

(If you cut both jumpers) A letter A will show up on the LCD indicating that radio is in the AM mode.

To go back to FM, just press B again. I think B just activates a second VFO in the radio,

since radio retains the AM frequency when toggle in and out of the AM mode.

My serial number is 8221, so this mod should work for radio with serial numbers close to mine.

The radio will not transmit in AM mode, but it will transmit up to the ~160MHz range.

Try this mod at your own risk!