Icom IC-706 MKII Instruction Manual page 30

27
4 RECEIVE AND TRANSMIT
© Optional AH-3 AUTOMATIC ANTENNA TUNER Operation
The AH-3 matches the IC-706MKIi 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.
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.
© Set the desired frequency in an HF band.
AH-3 setting example: eThe AH-3 will not operate on frequencies outside of
ham bands.
For mobile operation
~<— Optional AH-2b
antenna element
@ 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
NEVER operate the AH-3 without an antenna wire. complete.
The tuner and transceiver will be damaged. eWhen the connected wire cannot be tuned, the
[TUNER] light goes out, the AH-3 is bypassed and the
NEVER operate the AH-3 when it is ungrounded. antenna wire is connected to the antenna connector on
the transceiver directly.
Transmitting before tuning may damage the trans- @ To bypass the AH-3 manually, push [TUNER].
ceiver. Note that the AH-3 cannot tune when using a fo ote es
12 à long wire or multiple of the operating frequency. CONVENIENT
¢PTT tune function
Note: The AH-3 can be used for HF bands only. It The AH-3 is always tuned when the PTT is pushed
cannot be used for the 50 MHz or 144 MHz bands. after the frequency is changed (more than 1%). This
function removes the "push and hold [TUNER]" oper-
ation and activates first transmission on the new fre-
quency. This function is turned ON in initial set mode,
item 13 (p. 46).