Icom IC-7800 Service Manual Addendum page 364

3-7-9 RELAY CONTROLLER (BPF UNIT; IC102)
Pin Port
number name
Outputs the RX-A circuit bandpass fil-
ter group select signal.
6 HF50A
Low : While receiving on 30–60 MHz.
Outputs the RX-A circuit 12 dB atten-
uator control signal.
7 AT12A
High : The 12 dB attenuator is ON.
Outputs the RX-A circuit 6 dB attenu-
ator control signal.
8 AT6A
High : The 6 dB attenuator is ON.
Outputs the RX-A circuit 3 dB attenu-
ator control signal.
9 AT3A
High : The 3 dB attenuator is ON.
Outputs the RX-A circuit split function
control signal.
11 DWSPA
Low : The split function is ON.
Outputs the RX-A circuit mute control
signal.
12 RMUTA
Low : While the RX-A circuit is muting.
Outputs the transverter's receiver cir-
cuit control signal.
13 TRVS
High : The transverter is ON.
Outputs receive antenna ([ANT 4])
select signal.
14 RSELA
Low : [ANT 4] is selected.
Outputs the RX-A circuit 50 MHz pre-
amplifier 2 control signal.
16 VPR2A
Low : The pre-amplifier 2 is ON.
Outputs the RX-A circuit 50 MHz cor-
rection amplifier control signal.
17 VDWA
Low : The pre-amplifier 2 is ON
Description
(Receive 50 MHz band).
3-7-10 RELAY CONTROLLER (BPF UNIT; IC401)
Pin Port
number name
6 B0B
7 B1B
8 B2B
9 B3B
10 B4B
11 B5B
12 B6B
13 B7B
14 B8B
15 B9B
16 B10B
17 B10WB
3 - 20
Description
Outputs the RX-B circuit bandpass fil-
ter (0.03–1.6 MHz) select signal.
Outputs the RX-B circuit bandpass fil-
ter (1.6–2 MHz) select signal.
Outputs the RX-B circuit bandpass fil-
ter (2–3 MHz) select signal.
Outputs the RX-B circuit bandpass fil-
ter (3–4 MHz) select signal.
Outputs the RX-B circuit bandpass fil-
ter (4–6 MHz) select signal.
Outputs the RX-B circuit bandpass fil-
ter (6–8 MHz) select signal.
Outputs the RX-B circuit bandpass fil-
ter (8–11 MHz) select signal.
Outputs the RX-B circuit bandpass fil-
ter (11–15 MHz) select signal.
Outputs the RX-B circuit bandpass fil-
ter (15–22 MHz) select signal.
Outputs the RX-B circuit bandpass fil-
ter (22–30 MHz) select signal.
Outputs the RX-B circuit bandpass fil-
ter (50–54 MHz) select signal.
Outputs the RX-B circuit bandpass fil-
ter (30–50 MHz and 54–60 MHz)
select signal.