Operation Manual

11
ANTENNA TUNER OPERATION
11-2
About the internal antenna tuner
The internal automatic antenna tuner automatically
matches the transceiver to the antenna within the
range of 16.7 ~ 150 Ω (SWR of less than 3:1).
When the tuner has matched an antenna over some
period of operating time, latching relays of up to 100
combinations have been memorized as preset points.
If the frequency is tuned over ± 1.5% of the current
memorized frequency point, the tuner uses the relay
combinations of the next memorized point (if it is
within ± 1.5% of the new frequency). If there are no
memorized points with the range, the tuner switches
to bypass.
• When you install a new antenna, or you want to
change the antenna settings, you can clear the all
of the internal antenna tuner preset points with the
“<<Preset Memory Clear>>” item on the TUNER set
screen. (p. 12-5)
MENU
»
SET > Function > Tuner >
<<Preset Memory Clear>>
• You can select whether or not to save the internal
antenna tuner’s status after pushing
TUNER
on each
band in the “[TUNER] Switch” item on the TUNER
set screen. (p. 12-5)
MENU
»
SET > Function > Tuner >
[TUNER] Switch
NOTE: When the transceiver receives a strong physical
shock, some of the internal latching relays may unlatch. In
that case, push
TUNER
to turn OFF the tuner, then turn
ON again to reset all the latching relays.
Internal antenna tuner operation
1. Push
TUNER
to turn ON the internal antenna
tuner.
• “TUNE” is displayed when the tuner is ON.
2. Tune the antenna.
L To tune the antenna, see “Manual tuning” or “PTT
Tuner start” below.
D Manual tuning
You can manually tune the antenna before
transmitting for the rst time.
1. Hold down
TUNER
for 1 second to start manual
tuning.
• The tuner reduces the SWR to less than 1.5:1 after
2~3 seconds of tuning.
L While tuning, a side tone is heard and “TUNE” blinks
red.
2. After tuning, “TUNE” is displayed.
L If the tuner cannot tune, “TUNE” disappears and the
tuning circuit is automatically bypassed
D PTT Tuner start
The tuner is always activated when PTT is pushed
after the frequency is changed (more than 1% from
last-tuned frequency). This function tunes the antenna
for the rst transmission on a new frequency.
L This function can be turned ON in the “PTT Start”
item of the TUNER set screen. (p. 12-5)
MENU
» SET > Function > Tuner > PTT Start
NOTE: If the SWR is higher than about 1.5:1, hold down
TUNER
for 1 second to start manual tuning.
If the tuner cannot tune the antenna
• Repeat manual tuning several times.
• Even if the tuner cannot tune the antenna on the rst
tuning, it may success at the second tuning.
• Some antennas, especially for the low bands, have a
narrow bandwidth. These antennas may not tune at
the edge of their bandwidth, therefore, tune such an
antenna as follows:
(Example):
Suppose you have an antenna which has an SWR of
1.5:1 at 3.55 MHz and an SWR of 3:1 at 3.8 MHz.
1. Set 3.55 MHz, and hold down
TUNER
for 1
second to start manual tuning.
2. Set 3.80 MHz, and hold down
TUNER
for 1
second to start manual tuning.