ICOM IC-255E FOR PACKET RADIO
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The IC-255 will work FB for packet radio provided that you use low impedance
into the tx AF circuit (mike-input has 1k ohm resistor to plus 12v) so
impedance in AFSK should be 600 ohm or less to avoid noise from +12v line.
On RX use the output from ext. spkr with 100 ohm connected across the jack,
or as I have done; connect a wire from ext spkr output to a spare pin at the
mike-socket for AF, and connect a 100 ohm resistor across the ext-spkr jack -
which is plugged into the transceiver for packet radio - such that no audio
noise will be heard in the shack.
AF output from rx seems to be low, so I use the AF gain turned fully
clockwise for my KPC-2 with AF-interface (to monitor AF-level).
Adjust TX mod and RX-AF to proper levels.

73 Jan-martin LA8AK

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