2-6
INST signalINST signal
INST signalINST signal
INST signal
When equipped with the DSC general watch keeping receiver PCB, the “J2-#1: INST” signal, turning
to “L” level, is input to the CONTROL/MODEM board.
The control section CPU (Main CPU) recognizes that the board is installed, and controls this board. If
this board is not installed, the CPU remotely controls the receiver of the MF/HF radiotelephone. The
DSC watch keeping receiver PCB does not use the INST signal.
OperOper
OperOper
Oper
aa
aa
a
tion detion de
tion detion de
tion de
pending on prpending on pr
pending on prpending on pr
pending on pr
esence or aesence or a
esence or aesence or a
esence or a
bsence of DSC gbsence of DSC g
bsence of DSC gbsence of DSC g
bsence of DSC g
enerener
enerener
ener
al wal w
al wal w
al w
aa
aa
a
tctc
tctc
tc
h kh k
h kh k
h k
eeee
eeee
ee
ping rping r
ping rping r
ping r
eceiecei
eceiecei
ecei
vv
vv
v
er PCB:er PCB:
er PCB:er PCB:
er PCB:
Present: Scanning receiving of DSC general frequency and receiving of DSC acknowledge back
signal are performed by the MF/HF general watch keeping receiver board.
Absent: Scanning receiving of DSC general frequency and receiving of DSC acknowledge back
signal are performed by the MF/HF radiotelephone.
3. Function and overview of each board
DSC-60
MF/HF
Radiotelephone
NBDP Terminal
MF/HF DSC general
watch keeping
DSC distress and safety
frequencies
SSB, NBDP, DSC
communication
MF or MF/HF DSC
watch keeping
receiver PCB
or
DSC-60
MF/HF
Radiotelephone
NBDP Terminal
MF/HF DSC
general watch
keeping receiver
PCB
DSC distress and safety
frequencies
SSB, NBDP, DSC
communication
DSC general
frequencies
MF or MF/HF DSC
watch keeping
receiver PCB
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