Icom IC-718 Instruction Manual - Page 16

External antenna tuners - hf

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3 INSTALLATION AND CONNECTIONS CONNECTING A NON-ICOM LINER AMPLIFIER R WARNING: Set the transceiver output power and linear amplifier ALC output level referring to the linear amplifier instruction manual. The ALC input level must be in the range 0 V to -4 V, and the transceiver does not accept positive voltage. Nonmatched ALC and RF power settings could cause a fire or ruin the linear amplifier. To an antenna RF OUTPUT RF INPUT SEND ALC Non-Icom linear amplifier 50 Ω coaxial cable ANT IC-718 SEND 13 9 10 11 12 5678 1234 ALC The specifications for the SEND relay are 16 V DC 2 A. If this level is exceeded, a large external relay must be used. s External antenna tuners CONNECTING THE AH-4 (p. 29) Long wire or optional AH-2b Coaxial cable (from the AH-4) Control cable IC-718 Ground Ground AH-4 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-718's power OFF when connecting the AT-180, otherwise, the CPU may malfunction and the AT-180 may not function properly. Coaxial cable supplied with the AT-180 [ANT] ACC cable supplied with the AT-180 [ACC] one of two AT-180 [ACC] connectors HF antenna IC-718 13 9 10 11 12 5678 1234 Ground 14

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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-718’s 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 amplifier 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 fire or
ruin the linear amplifier.
RF OUTPUT
RF INPUT
ALC
SEND
50
Ω
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
1
2
3
4
8
7
6
5
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