Icom IC-7700 - Antenna Tuner Operation and Tuning

10-6
10
ANTENNA TUNER OPERATION
■ Antenna tuner operation
The internal automatic antenna tuner matches the
transceiver to the connected antenna automatically.
After the tuner matches an antenna, the variable ca-
pacitor settings are memorized as a preset point for
each frequency range (100 kHz steps). Therefore,
when you change the frequency range, the variable
capacitors are automatically preset to the memorized
setting.
CAUTION: NEVER transmit with the tuner ON
when no antenna is connected. This will damage
the transceiver. Be careful of the antenna selection.
D Tuner operation
➥ Push
TUNER
to turn the internal antenna tuner
ON. The antenna is tuned automatically when the
antenna SWR is higher than 1.5:1.
 •WhenthetunerisON,[TUNER]switchindicatorlights
green.
 •Whiletuning,[TUNER]switchindicatorblinksgreen.
• MANUAL TUNING
During SSB operation at low voice levels, the internal
tuner may not automatically tune correctly. In such
cases, manual tuning is helpful.
➥ Hold down
TUNER
for 1 second, to start manual
tuning.
 •Asidetoneisemittedand[TUNER]switchindicator
blinks red while tuning.
 •IfthetunercannotreducetheSWRtolessthan1.5:1
after 20 seconds of tuning, the [TUNER] switch indica-
tor goes out.
• AUTOMATIC TUNER START (HF bands only)
If you want to deactivate the tuner under conditions of
VSWR1.5:1orless,usetheautotunerstartfunction
and turn the tuner OFF. This function activates the
tunerautomaticallywhentheSWRexceeds1.5:1.
This function is controlled in set mode. (p. 12-13).
TUNER
NOTES:
•NEVER transmit without an antenna properly con-
nected to antenna port in use.
•When2ormoreantennasareconnected,select
the antenna to be used with [ANT].
•IftheSWRishigherthanabout1.5:1whentuning
farther than 100 kHz from an antenna’s pro-
grammed preset point, hold down
TUNER
for 1
second to start manual tuning.
•TheinternaltunermaynotbeabletotuneinAM
mode. In such cases, hold down
TUNER
for
1 second to manually tune.