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CONNECTING THE AT-180 (p. 28)
DO NOT! connect AT-180 and AH-4 at the same
time. Both tuners will not function correctly.
Turn the IC-718s power OFF when connecting the
AT-180, otherwise, the CPU may malfunction and
the AT-180 may not function properly.
14
3
INSTALLATION AND CONNECTIONS
External antenna tuners
CONNECTING A NON-ICOM LINER AMPLIFIER
R WARNING:
Set the transceiver output
power and linear amplifier
ALC output level referring to
the linear amplier instruction
manual.
The ALC input level must be
in the range 0 V to 4 V, and
the transceiver does not ac-
cept positive voltage. Non-
matched ALC and RF power
settings could cause a re or
ruin the linear amplier.
1234
8765
9
10 11 12
13
RF OUTPUT RF INPUT
ALC
SEND
50 coaxial cable
IC-718
ANT
ALC
SEND
To an
antenna
Non-Icom linear amplifier
The specifications for the SEND relay are 16 V
DC 2 A. If this level is exceeded, a large external
relay must be used.
CONNECTING THE AH-4 (p. 29)
Coaxial cable (from the AH-4)
Long wire or optional AH-2b
Ground
IC-718
AH-4
Control cable
Ground
1234
8765
9
10 11 12
13
Ground
HF
antenna
[ANT]
[ACC]
[ACC]AT-180
ACC cable supplied with the AT-180
Coaxial cable supplied
with the AT-180
IC-718
one of two
connectors
IC-718.qxd 02.9.6 14:29 Page 14
16


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