Icom IC-706 Instruction Manual page 29

RECEIVE AND TRANSMIT 4
© Optional AH-3 AUTOMATIC ANTENNA TUNER Operation
The AH-3 matches the IC-706 to a long wire antenna
more than 3 m/10 ft long (3.5 MHz and above) or
more than 12 m/40 ft long (1.8 MHz and above).
«See p. 14 for connection.
e See the AH-3 instruction manual for AH-3 installation and
antenna connection details. s
AH-3 setting example:
For mobile operation
~<—— Optional AH-2b
antenna element
NEVER operate the AH-3 without an antenna wire.
The tuner and transceiver will be damaged.
NEVER operate the AH-3 when it is ungrounded.
Transmitting before tuning may damage the trans-
ceiver. Note that the AH-3 cannot tune when using a
e i. long wire or multiple of the operating frequency.
Z NOTE: The AH-3 can be used for HF bands only.
Z, It cannot be used for the 50 MHz or 144 MHz
4% bands.
QQ
CONVENIENT
AH-3 operation
Tuning is required for each frequency. Be sure to
re-tune the antenna before transmitting when you
change the frequency—even slightly. —
(D Set the desired frequency in an HF band.
*The AH-3 will not operate on frequencies outside of
ham bands.
Q Push and hold [TUNER] for 2 sec.
*The [TUNER] light flashes and "CW" appears while tun-
ing.
@ The [TUNER] light lights constantly when tuning is
complete.
*When the connected wire cannot be tuned, the
[TUNER] light goes out, the AH-3 is bypassed and the
antenna wire is connected to the antenna connector on
the transceiver directly.
(9 To bypass the AH-3 manually, push [TUNER].
*PTT tune function
The AH-3 is always tuned when the PTT is pushed
after the frequency is changed (more than 1%). This
function removes the "push and hold [TUNER]' oper-
ation and activates first transmision on the new fre-
quency. This function is turned ON in quick set mode,
item 13 (p. 44).