IC-04 frequency expansion
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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 cutters (be careful!).
5.  Retune the VCO to cover your desired frequency spread. The sample 04AT
    goes from 441-473MHz, which is pretty good.
6.  Any frequency may be entered directly on the keypad (starting with the
    10MHz digit).

Be careful not to transmit out-of-band, or accidentally operate on any
non-amateur frequency, unless you are authorized to do so.

DO NOT JEOPARDIZE YOUR LICENCE!
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(Downloaded from GB7SYP)