Antenna Tuner OperatOn; Optional External Tuner Operation - Icom IC-7600 Instruction Manual

• Automatic tuner start (HF bands only)
If you want to deactvate the tuner under condtons
of VSWR 1.5:1 or less, use the auto tuner start func-
ton and turn the tuner OFF. Ths functon actvates
the tuner automatcally when the SWR s hgh.
Ths functon s controlled n set mode. (p. 129).
• The tuner may not be actvated f the TX power s not
output stably longer than the specfed tme perod as
SSB or CW mode operaton.

■ Optional external tuner operation

• AH-4 HF AUTOMATIC ANTENNA TUNER
The AH-4 matches the IC-7600 to a long wre antenna
more than 7 m/23 ft long (3.5 MHz and above).
• See p. 18 for the transcever and AH-4 connecton.
• See the AH-4 nstructon manual for AH-4 nstalla-
ton and antenna connecton detals.
AH-4 setting example:
For mobile operation
For outdoor operation
Long wire
R DANGER: HIGH VOLTAGE!
NEVER
touch the antenna element whle tunng
or transmttng.
NEVER
operate the AH-4 wthout an antenna wre.
The tuner and transcever wll be damaged.
NEVER
operate the AH-4 when t s not grounded.
Transmttng before tunng may damage the trans-
cever. Note that the AH-4 cannot tune when usng a
½λ long wre or multple of the operatng frequency.
When connectng the AH-4, the antenna connector
assgnments are [ANT2] for the nternal tuner and
[ANT1] for the AH-4. The antenna ndcator n the
LCD dsplays "ANT1(EXT)" when the AH-4 s con-
nected and selected.
• PTT tuner start
Tunng of the nternal*/external antenna tuner starts
when [PTT] s pushed on a new frequency (more than
1% from last-tuned frequency). Ths functon removes
the "push and hold [TUNER]" operaton and actvates
for the frst transmsson on a new frequency.
*Tunng starts f the nternal antenna tuner s ON.
Ths functon s turned ON n set mode. (p. 129).
• AH-4 operation
Tunng s requred for each frequency. Be sure to
re-tune the antenna before transmttng when you
change the frequency— even slghtly.
q Set the desred frequency n an HF or 50 MHz
band for use wth the AH-4.
• The AH-4 wll not operate on frequences outsde
w Push and hold [TUNER] for 1 sec.
Optional AH-2b
• The ndcator on the swtch blnks whle tunng.
antenna element
e The ndcator on the swtch lghts constantly when
tunng s complete.
• When the connected wre cannot be tuned, the
r To bypass the AH-4 manually, push [TUNER].
NOTE: PTT tuner functon s also avalable. See
p. 129 for detals.
• Antenna tuner of the IC-PW1/EURO
When usng an external antenna tuner such as the IC-
PW1/EURO's tuner, tune wth the external antenna
tuner, whle the nternal tuner s turned OFF. After tun-
ng s completed, turn the nternal tuner ON.
Otherwse, both tuners tune smultaneously and cor-
rect tunng may not be obtaned.
See the nstructon manual ncluded wth each
antenna tuner for ther respectve operatons.
ANTENNA TUNER OPERATION
of ham bands.
TUNER
ndcator on the swtch goes out and the AH-4 s
bypassed. At that pont the antenna wre connec-
ton s to the transcever drectly, and not va the
AH-4 antenna tuner.
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