Undocumented features of the IC-24AT - (from ICOM)
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The IC-24AT dual band hand-held has three additional features which are not
described in the owner's manual. They have been left out of the manual
because some countries restrict the use of the radio in these modes.

AM aircraft receive plus 740 TO 960MHz receive:

Remove D13 from the main logic board (this diode may already be removed by
ICOM in some units). D13 is on the main logic board and is a discrete diode
(one of two in the radio) near the centre of the board. It is the leftmost
discrete diode of the two on the board, when the radio is held open and the
controls are positioned away from you.

Whilst simultaneously holding the "LIGHT", "B" and "=" keys depressed, turn
the power on.

It should be noted that the radio will not meet specifications on the
out-of-band receive frequencies which are enabled with this modification.

Direct keyboard entry of 100MHz frequency:

Turn power on whilst simultaneously holding the "LIGHT" and "3" keys
depressed.

Cross-band repeat (simplex):

Remove D14 from the main logic board (the diode may already have been removed
by ICOM in some units). The diode is a discrete component to the right of D13
(see above), and directly adjacent to it.

Hold "FUNCT" depressed and press "C".

To turn ON cross-band repeat:
Hold "FUNCT" depressed, press "5" then press "D".

To turn OFF cross-band repeat:
Simultaneously depress "FUNCT" and "D".

G4ZLY @ GB7ZZZ

(Downloaded from GB7SYP)