Antenna Tuner Operation; D Tuner Operation - Icom IC-7700 Instruction Manual

10

ANTENNA TUNER OPERATION

■ Antenna tuner operation

D D Tuner operation
TUNER
• MANUAL TUNING
• AUTOMATIC TUNER START (HF bands only)
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 ca-
pacitors are automatically preset to the memorized set-
ting.
CAUTION: NEVER transmit with the tuner ON when
no antenna is connected. This will damage the
transceiver. Be careful of the antenna selection.
➥ Push
to turn the internal antenna tuner ON.
TUNER
The antenna is tuned automatically when the an-
tenna SWR is higher than 1.5:1.
• When the tuner is ON, [TUNER] switch indicator lights
green.
• While tuning, [TUNER] switch indicator blinks green.
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, push and hold
sec. to start manual tuning.
• The internal tuner may not be able to tune in AM
mode. In such cases, push and hold
1 sec. to manually tune.
During SSB operation at low voice levels, the internal
tuner may not automatically tune correctly. In such
cases, manual tuning is helpful.
➥ Push and hold
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 sec. of tuning, the [TUNER] switch indicator
goes out.
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).
10-6
TUNER
for 1 sec., to start manual
TUNER
for 1
for
TUNER