Icom IC-703 - Set Mode Adjustments (No.2)

16
2
INSTALLATION AND CONNECTIONS
■ External antenna tuners and linear amplifier
GroundGround
Long wire or optional AH-2b
AH-4
ANT
IC-703
Coaxial cable
(from the AH-4)
CONNECTING THE AH-4
IC-703
Ground
Ground
AT-180
CONNECTING THE AT-180
HF
to 6 m
antenna
[TRANSCEIVER]
[ANT]
[ANT]
[ACC] [ACC]
ACC cable supplied with the AT-180
Coaxial cable supplied
with the AT-180
one of two
connectors
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.
•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.
HSEND
(Orange)
ALC (Blue)
13.8V (Gray)
Ground
Relay
RF INRF OUT
ALC
SEND
ANT
ACC cable
ACC
IC-703
50 Ω coaxial cable
To an
antenna
2