Wh Ah-3 Hf Automatic Antenna Tuner - Icom IC-707 Instruction Manual

3 OPERATION
Mi AH-3 HF AUTOMATIC ANTENNA TUNER
An optional AH-3 allows you HF operation where
antenna element length is restricted due to space.
ZA WARNING: DANGER HIGH
VOLTAGE! NEVER touch the antenna
terminal, ground terminal or antenna element
while transmitting. Place the AH-3 and antenna
in positions where no one touches them.
NEVER operate the AH-3 without an antenna
element.
damaged.
The tuner and transceiver may be
NEVER transmit during internal adjustment to
prevent electric shock.
USE the ground terminal for ground connection.
The mounting plate is not connected internally.
AVOID using the AH-3 in areas where the tem-
perature is below —10°C (+14°F) or above +
HY, 60°C (+140°F).
WA AA
Refer to the AH-3 instruction manual for AH-3 in-
stallation and antenna connection details.
AH-3 setting example:
For mobile operation
<— Optional
AH-2b ANTENNA
ELEMENT
For outdoor operation
Long-wire
antenna
SET mode setting
Refer to pgs. 30, 31, select tuner type "AH-3."
AH-3 operation
The AH-3 requires re-tuning for each frequency.
When you change the operating frequency even a
little bit, re-tune before transmitting.
Tuning |
1) Select the desired frequency in a ham band.
2) Push and hold the [TUNER] switch until "TUNE"
blinks.
ETOS.
[TUNE] switch oi Ea ©
e A 0: o KO [s] ;
CW mode is automatically selected and
"TUNE" blinks.
"TUNE" appears constantly when the tuning
is complete.
If the AH-3 cannot tune the connected antenna,
"THRU" appears. The [ANT] connector is
directly connected to the antenna.
si s5 8
CAUTION: DO NOT transmit if the AH-3
cannot tune the connected antenna, since the
Z \C-707 may be damaged.
Through function
If required, the AH-3 can be bypassed manually.
1) While "TUNE" appears, push the [TUNER] switch
temporarily.
è The AH-3 is bypassed and the [ANT] connector is
directly connected to the antenna.
"THRU" appears.
.
2) To activate the AH-3, push and hold the [TUN-
ER] switch.
e "TUNE" appears.