I External Antenna Tuners And Linear Amplifier - Icom IC-703 Instruction Manual

Hf/50 mhz all mode transceiver
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I External antenna tuners and linear amplifier
CONNECTING THE AH-4
IC-703
ANT
Ground
Coaxial cable
(from the AH-4)
CONNECTING THE AT-180
[ACC]
IC-703
[ANT]
Ground
Note:
Turn the IC-703's power OFF when connecting
the AT-180, otherwise, the CPU may malfunction
and the AT-180 may not function properly.
CONNECTING A NON-ICOM LINEAR AMPLIFIER
R WARNING:
•Set the transceiver output power and linear ampli-
fier ALC output level referring to the linear amplifier
instruction manual. Be sure the linear amplifier key-
ing circuit control voltage is compatible with the IC-
703, before connecting to HSEND line (ACC cable).
•The ALC input level must be in the range 0 V to
–4 V, and the transceiver does not accept positive
voltage. Non-matched ALC and RF power settings
could cause a fire or damage the linear amplifier.
To an
antenna
RF OUT
RF IN
Ground
ACC cable supplied with the AT-180
[ANT]
AT-180
Coaxial cable supplied
[TRANSCEIVER]
with the AT-180
50 Ω coaxial cable
ALC
SEND
Relay
INSTALLATION AND CONNECTIONS
AH-4
[ACC]
•The specifications for the SEND relay are 16 V
DC 0.5 A. If this level is exceeded, a large external
relay must be used.
ANT
ALC (Blue)
Ground
HSEND
(Orange)
13.8V (Gray)
ACC cable
Long wire or optional AH-2b
HF
to 6 m
antenna
one of two
connectors
Ground
IC-703
ACC
2
2
16

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