49
50
51
52
53
54
55
57–60
61–64
65–67
68
70
71
72
74
Outputs data to PLL and DDS ICs.
Outputs a clock signal to PLL and DDS
ICs.
Outputs an AF mute signal for squelch
function.
High : squelch closed.
Outputs an external NBDP equipment
control signal.
Low : during NBDP data output
Outputs a “noise blanker” signal.
High : noise blanker is on
Outputs intercom gate control signal.
Outputs a strobe signal for an initial
matrix.
Input ports for an initial matrix.
Output band signals for RF LPF and
BPF selection.
Outputs mode signals.
Input port for an optional AT-130.
Low : during tuning.
Outputs an antenna tuner tuning con-
trol signal for transceiver’s
power/mode control.
Outputs a narrow filter selection sig-
nal.
Low : for an optional narrow filter
selection.
Outputs a program scan control signal
for “AGC fast” and “audio squelch”
deactivation.
Outputs the “ tuner start” pulse to an
optional AT-130.
3 - 7
DATA
CK
SQL C
NBS
AGCS
INC
P20
P17–P14
PD–PA
J2B, R3E,
H3E
KEY
TUNE
FSEL
PROG
STAT
(MAIN unit; IC44)–Continued
Pin
Port
Description
number
name
