User's Manual Part 4

10-5

■ Antenna tuner operation

The internal automatic antenna tuner matches the

transceiver to the connected antenna automatically.

Once the tuner matches an antenna, the variable ca-

pacitor angles 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

point.

CAUTION: NEVER transmit with the tuner ON when

no antenna is connected. This will damage the

transceiver. Be careful of the antenna selection.

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, the “TUNE” indicator appears.

• MANUAL TUNING

During SSB operation at low voice levels, the internal

tuner may not be tuned correctly. In such cases, man-

ual tuning is helpful.

➥ Push [TUNER] for 1 sec., to start manual tuning.

• A side tone is emitted and “TUNE” indicator blinks 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.

• 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 turned ON in set mode. (p. 12-14).

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

above 100 kHz on an antenna’s preset point, push

[TUNER] for 1 sec. to start manual tuning.

• The internal tuner may not be able to tune in AM

mode. In such cases, push [TUNER] for 1 sec. to

manually tune.

[TUNER]

ANTENNA TUNER OPERATION