Operation Manual

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ANTENNA TUNER OPERATION
The internal automatic antenna tuner matches the
transceiver to the connected antenna automatically.
Once the tuner matches an antenna, the latching relays
combination are memorized as a preset point for each
frequency range (100 kHz steps). Therefore, when you
change the frequency range, the latching relays are au-
tomatically preset to the memorized combination.
CAUTION: NEVER transmit with the tuner ON
when no antenna is connected. This will damage
the transceiver. Be careful of the antenna selection.
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 ‘TUNER’ indicator lights red.
• MANUAL TUNING
Push [TUNER] for 1 sec., to start manual tuning.
•A side tone is emitted and ‘TUNER’ indicator blinks
while tuning.
•If the tuner cannot reduce the SWR to less than 1.5:1
after 20 sec. of tuning, the ‘TUNER’ indicator goes out.
• PTT TUNER START
The tuner is always tuned when the PTT is pushed
after the frequency is changed (more than 1% from
last-tuned frequency). This function removes the
“push and hold [TUNER]” operation and activates for
the first transmission on a new frequency.
This function can be turned ON in initial set mode
(p. 81).
• TUNER RESET
q Make sure the transceiver power is OFF.
w While pushing [Y] and [Z], push [POWER] to turn
power ON.
•“CLEAR ? OK” appears as shown below.
e Rotate main dial to select tuner reset.
r Then Push [F-3] for 1 sec to start tuner resetting.
• The memorized tuner settings are reset.
[TUNER]
TUNER
Lights to indicate internal tuner is activated.
CLEAR ? OK
F 3
[POWER]
[Y]
[Z]
DD
If the tuner cannot tune the antenna
Check the following and try again:
• the antenna connection and feedline.
•the unaltered antenna SWR.
(Less than 3:1 for HF bands;
Less than 2.5:1 for 50 MHz band)
• the power source voltage/capacity.
If the tuner cannot reduce the SWR to less than
1.5:1 after checking the above, perform the follow-
ing:
• repeat manual tuning several times.
•tune with a 50 Ω dummy load and re-tune the antenna.
• turn power OFF and ON.
•adjust the antenna cable length.
(This is effective for higher frequencies in some cases.)
•Some antennas, especially for low bands, have a nar-
row bandwidth. These antennas may not be tuned at
the edge of their bandwidth, therefore, tune such an
antenna as follows:
NOTES:
•The internal antenna tuner can tune the HF to 50 MHz
bands.
•NEVER transmit without an antenna properly connected
to antenna port in use.
•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.
•When strong impact is applied, the internal tuner may
not work properly caused by the latching relay is off po-
sition. In this case, push [POWER] momentarily to reset
the all latching relays while transceiver power is ON.
D Internal antenna tuner
D Tuner operation
■ Antenna tuner operation
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