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HamCall (October 1991)
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ic_24a.key
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1990-10-14
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IC-24AT Undocumented Features
The IC-24AT dual band handheld had three additional features that
are not described in the owners manual. These have been left out
of the owners manual because some countries restrict the use of
the radio in these modes.
AM AIRCRAFT RECEIVE PLUS 740 to 960 MHz RECEIVE
Remove D13 from the main logic board (this diode may already be
removed by ICOM in some units). This diode may already be
removed in some radios. D13 is on the main logic board and is a
discreet diode (one of the two in the radio) near the center of
the board. It is the left discreet diode of the two on the board
when the radio is open and held with the controls away from you.
Simultaneously hold "Light", "B", and "#" keys depressed and turn
power on.
It is important to note that the radio will not meet specifica-
tion on the out of band receive frequencies that are enabled with
this modification.
DIRECT KEYBOARD ENTRY of 100 MHz FREQUENCY
Simultaneously hold "Light" and "3" keys depressed and turn power
on.
CROSS BAND REPEAT (simplex)
Remove D14 from the main logic board (this diode may already be
removed by ICOM in some units). The diode is a discreet diode to
the right of D13 (from above) and directly beside it.
Simultaneously hold "Funct" depressed and push "C".
Hold "Funct" depressed then push "5" and then push "D".
To turn off cross band repeat simultaneously hold "Funct" and "D"
depressed.
2-14-90