9: Processor Board
9-12 PRC1099A-MS
10 +12 12 VDC supply voltage for the LCD backlight.
11 SPARE1 Open connection on Audio/Filter board.
12 SPARE3 No connection.
13 SPARE2 Open connection on Audio/Filter board.
14 GND Ground.
15 CWKEY CW Key line from both front panel Audio
connectors.
16 PTT PTT from front panel Audio connectors and
Accessory connector.
17 CONTRAST Contrast control from the Audio/Filter board.
Sets contrast of LCD display to display driver
U1.
18 EXTSEL External amplifier RA100 filter select line.
19 DIGDN Digital knob down position line.
20 TUNEINIT Initiates tune cycle to RAT7000B antenna
tuner through front panel Accessory
connector pin D.
21 ANTSW From internal antenna switch in the Whip
Antenna connector.
22 CHSET/TUNE From the front panel Whip tune button.
23 HANDSET Not used.
24 ALC ALC line to a RA100 external RF amplifier
through the front panel Accessory connector
pin N. ALC signal from the RA100 ALC
activates PRC1099A ALC circuitry.
25 DIGUP From front panel DIGIT switch (S4) up
position.
26 AMPPTT PTT output to RA100 external amplifier.
27 RS232TXD Serial data line to external RA100 amplifier or
RAT7000B antenna tune. Also serial TX line
for remote control terminal.
28 RS232RXD Serial clock line to external RA100 amplifier
or RAT7000B antenna tuner. Also serial RX
line for remote control terminal.
29 EXTAMP From the front panel Power switch (S7)
EXT AMP position. Sets to radio to low RF
output power (5W) for use with external
amplifier RA100.
Table 9-6 J5 Connector Pin Assignments (continued)
Pin Signal Description
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