Operator conveniences, Antennas, Apo (auto power off) – Kenwood TS-480SAT User Manual
Page 68: Automatic antenna tuner
60
OPERATOR CONVENIENCES
2 Press [ATT/PRE/ ANT1/2] (1 s) to select “1
t
ANT”
or “ANT
s
2”.
•
If the external antenna tuner (AT-300) is
connected to the ANT 1 connector, select
ANT 2 to use the internal antenna tuner. The
internal antenna tuner is automatically
bypassed if the external antenna tuner
(AT-300) is connected to ANT 1.
3 Press [AT] momentarily.
•
“AT
s
T” appears, indicating that the antenna
tuner is in-line (not bypassed).
4 Press [AT] (1 s).
•
CW mode is automatically selected and tuning
begins.
•
“AT
s
T” blinks and the LED lights red.
•
To cancel tuning, press [AT] again.
•
If the SWR of the antenna system is extremely
high (more than 10:1), an alarm (“SWR” in
Morse code) sounds and the internal antenna
tuner is bypassed. Before attempting to tune
again, adjust the antenna system to lower the
SWR.
5 Monitor the display and check that tuning has
successfully finished.
•
If the tuning was successful, “AT
s
T” stops
blinking and the red LED turns OFF.
•
If tuning does not finish within approximately
20 seconds, an alarm (“5” in Morse code)
sounds. Press [AT] to stop the alarm and
tuning.
•
If you want the transceiver to stay in
transmission mode after the tuning completes,
access Menu No. 25 and select “on”.
If you access Menu No. 26 and select “on”, received
signals will also pass through the internal antenna
tuner. When this function is ON, “R
t
AT” appears.
This may reduce interference on the receive
frequency.
Note:
◆
The internal antenna tuner will not tune outside the available
transmission frequency limits.
◆
Pressing [AT] for more than one second while transmitting,
interrupts transmitting and starts tuning.
◆
While using CW Full Break-in, the internal antenna tuner will be
in-line for both transmission and reception.
◆
Tuning automatically turns OFF in approximately 60 seconds.
“AT” disappears and the error beeps stop.
◆
Tuning may still continue when the SWR meter indicates 1:1.
This happens due to the tuning algorithm; this is not a
malfunction.
◆
Even though the SWR meter shows more than one segment, the
internal antenna tuner may not re-tune. This happens because
of an SWR calculation algorithm tolerance.
◆
If tuning does not finish even though the SWR meter indicates
smaller than 3:1, adjust the antenna system to lower the SWR,
then attempt to tune again.
◆
Tuning may not reach an SWR of 1:1, depending on the
transceiver conditions.
ANTENNAS
Two antenna connectors are available for the HF/
50 MHz band on the TX/ RX unit rear panel {page
16}.
Press [ATT/PRE/ ANT1/2] (1 s) to select ANT 1 or
ANT 2.
•
“1
t
ANT” or “ANT
s
2” appears to indicate which
antenna is selected.
The ANT 1/ ANT 2 setting will automatically be stored
in the antenna band memory. Next time you select
the same band, the same antenna will be
automatically selected.
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~
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~
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4
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1
2
~
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1
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5
2
~
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1
2
0
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3
~
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5
2
0
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0
6
~
0
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0
3
Note:
Connect an external tuner to the ANT 1 connector only, then
select ANT 1. The internal antenna tuner will be automatically
bypassed when the transceiver is switched ON.
APO (Auto Power OFF)
You can set the transceiver to switch OFF
automatically if no keys or controls are pressed or
adjusted for a certain period of time. One minute
before the transceiver switches OFF, “CHECK” is
output in Morse code.
Press [MENU/ F.LOCK], then turn the MULTI control
to access Menu No. 59.
Select the APO time from “oFF”, “60”, “120”, or “180”
minutes.
Note:
◆
The APO function works even if the transceiver is scanning.
◆
The APO timer starts counting down the timer when no key
presses, no control adjustments, and no command (COM
connector) sequences are detected.
AUTOMATIC ANTENNA TUNER
As explained in “ANTENNA CONNECTION” {pages
2, 4}, matching the impedance of the coaxial cable
and antenna is important. To adjust the impedance
between the antenna and the transceiver, you have
the choice of using the internal antenna tuner
(TS-480SAT only) or an external antenna tuner. This
section describes how to use the internal antenna
tuner. For the external antenna tuner, consult the
instruction manual that comes with the tuner.
1 Select the transmit frequency.