61
13 OPERATOR CONVENIENCES
■
Presetting
After each successful tuning session, the AT
Preset memory function stores the position of the
tuning capacitor in the memory. The position of
the capacitor is stored for each of the antenna
tuner bands (see the following table) and for each
antenna connector (ANT 1 and ANT 2).
Press
[AT]
momentarily.
•
“
AT
s
T
” will appear, showing that the antenna
tuner is in-line (not bypassed).
•
Each time you go across the antenna tuner
band, the AT Preset memory is automatically
recalled to position the tuning capacitor without
the need for retuning. If no preset data exists
for a particular band/ antenna combination,
then the default data of 50
Ω
is used.
Note:
Tuning may restart in order to obtain the optimum
matching condition even though the current antenna tuner band
has the preset data.
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■
External Antenna Tuner type
If you want to use the external antenna tuner,
AT-300 with the TS-480 transceiver, access
Menu No. 27 and confirm that “At1” is selected
(default). “At2” is reserved for future updates.
Note:
When the AT-300 is used with the TS-480HX transceiver,
TX power is automatically reduced to 100 W (AM mode:
25 W). Also, the AT-300 cannot be used for 50 MHz operation.
ATTENUATOR
The attenuator function is useful when extremely
strong signals exist nearby your receiving frequency.
When these type of signals exist nearby your
receiving frequency, the AGC function may be
erroneously controlled by the strong signals, rather
than by the target receiving signal. If this happens,
the target receiving signal can be masked and buried
by the strong signals. In this case, turn the
Attenuator function ON. When it is ON, the signal is
attenuated approximately 12 dB.
1
Press
[ATT/PRE/ ANT1/2]
until the
ATT
icon
appears on the display.
•
“ATT” appears when it is turned ON.
To return to normal operation, press
[ATT/PRE/
ANT1/2]
until both the
ATT
and the
PRE
icons
disappear.
AUTO MODE
You can configure a maximum of 32 frequency
borders (VFO A and B) to change the operating mode
automatically as you change the VFO frequency.
As a default, the following modes are programmed on
each operating band.
0.03 MHz ~ 9.5 MHz: LSB
9.5 MHz ~ 60 MHz: USB
To add the frequency borders to the Auto Mode
selection:
1
Press and hold
[MODE]+[ ]
(POWER) to turn
the transceiver ON.
•
“AUTOMODE” appears on the sub-display.
2
Select an Auto Mode frequency memory channel
number by turning the
MULTI
control. Auto
Memory channels 00 to 31 are available.
3
Turn the
Tuning
control to select a desired
frequency border (or enter the frequency with the
keypad {page 34}) to change the operating mode.
4
Press
[MODE]
or
[MODE] (1 s)
until the desired
communication mode appears {page 19}.
5
Repeat steps
2
~
4
until you have added all the
data.
6
Press
[MTR/ CLR]
to exit the Auto Mode
frequency configuration.
The table below shows the default Auto Mode
frequency borders for the transceiver. When you
access Menu No. 02 and select “on”,
“AUTO”
appears. The transceiver automatically selects the
mode; LSB for frequencies below 9.5 MHz and USB
for frequencies greater than or equal to 9.5 MHz
(default).
.
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