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ICOM IC-04 Out of Band Modification [message #3040] Wed, 11 June 2014 00:27
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Registered: December 2004
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Out of Band Modification for the Icom IC-04

1. On the logic matrix, remove D402.
2. Add D402, D403 and D404 with the cathode at 4 o'clock and the anode at 12 o'clock. (You may use any signal diode such
as 1N914)
3. Add D405 with the cathode at 8 o'clock and the anode at 12 o'clock.
4. If you have a newer 04AT, the VCO cover will have holes in it that allow access to the tuning coils. If you have an older
04AT you will have to cut a hole in the VCO cover using a pair of small diagonals (be careful!).
5. Re-tune the VCO to cover your desired frequency spread. My 04AT goes from 441 to 473 MHz, which is pretty good.
6. Any frequency may be entered directly on the keypad (starting with the 10 MHz digit).
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