Icom IC-821H Service Manual page 16

MAIN
unit,
IC108
Pin
Port
Description
number name
4
SIDE Outputs side-tone select signal.
5 PHOUT
Outputs switching signal for head
phone audio select.
Outputs high speed packet control
6
EXMOD signal.
"High": 9600 bps is selected.
11 BKIN Outputs break-in control signal.
12
TOTe Outputs TOT control signal.
Outputs microphone amplifier gain
13 EGAIN
switching signal for external audio
input.
DISPLAY
unit,
IC8
Pin Port
Description
number name
Outputs attenuator control signal for
ATT140
VHF band.
4
"High": When attenuator is
activated.
Outputs attenuator control signal for
ATT400
UHF band.
5
"High": When attenuator is
activated.
Outputs pre-amplifier control signal for
PRE140
VHF band.
6
"High": When pre-amplifier is
activated.
Outputs pre-amplifier control signal for
PRE400
UHF band.
7
"High": When pre-amplifier is
activated.
12
LDIM
Outputs dimmer control signal.
"High": Bright
Outputs TX indicator control signal for
13 LEDTS
SUB band.
"High": SUB TX indicator lights
Outputs TX indicator control signal for
14 LEDTM
MAIN band.
"High": MAIN TX indicator lights
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