10: Display Board
10-6 PRC1099A-MS
10.2.4 J4 Connector
J4 connects to front panel Power, Mode, and Tune switches, and CW Key and
PTT lines on the Audio and Accessory connectors.
7 ANTSW Connects J1 pin 21 to ground when an
antenna is installed in the Whip antenna
connector.
8 CHSET/TUNE Connects J1 pin 22 to ground when the front
panel
WHIP TUNE button is pressed to
initiate a tune cycle and save tune data for
the selected antenna tuner.
9 HANDSET Not used; connects J1 pin 23 and J3 pin 3
through jumper LK1.
10 AMPALC Connects J1 pin 24 to a RA100 external RF
amplifier through the front panel Accessory
connector pin N.
ALC signal from the RA100 ALC to activate
PRC1099A ALC circuitry.
Table 10-3 J3 Connect Pin Assignments (continued)
Pin Signal Description
Table 10-4 J4 Connect Pin Assignments
Pin Signal Description
1 OPTSW Connects J1 pin 1 to ground through the front
panel
MODE switch OPT position.
2 LSBSW Connects J1 pin 3 to ground when the front
panel
MODE switch is set to the LSB
position to select lower side band mode.
3 SLEWDN Connects J1 pin 5 to ground through the front
panel
TUNE switch is pushed to the down
position to move down through selections
and settings within menus on the LCD.
4 SLEWUP Connects J1 pin 6 to ground when the front
panel
TUNE switch is pushed to the up
position to move up through selections and
settings within menus on the LCD.
5 SQUELCH Connects J1 pin 7 to ground when the front
panel
MODE switch is set to the SQUELCH
position to disable squelch.
6 SPARE1 Connects J1 pin 11 to open connection.
7 SPARE2 Connects J1 pin 13 to open connection.
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