Kenwood TS-990S - Manual (Page 76)

4 BASIC OPERATIONS
4-22
Index Contents
4 Ensure that the antenna tuning has completed.
• Upon normal completion of the antenna tuning, a Morse
code "T" sounds.
• "R<AT>T" stops flashing on and off, and remains on upon
completion of the antenna tuning. The "AT" LED lights.
• If the antenna tuning does not complete in 20 seconds, a
Morse code "5" alert sounds. In this case, pressing [AT/
TUNE] stops the tuning function and returns to receive
mode.
Note:
◆ The internal antenna tuner does not tune outside the licensed
transmit frequency range.
◆ Press and hold [AT/TUNE] during transmission to start tuning.
◆ If 60 seconds lapse and no matching is established, the tuning
automatically ends. In this case, the antenna tuner circuit is
switched Off, "AT", ">T" and "R<" disappear from the main screen,
and the "AT" LED becomes unlit.
◆ If the antenna tuning does not complete even with the antenna
having a Standing Wave Ratio of 3:1 or less, adjust the antenna
system to lower the Standing Wave Ratio, then restart the tuning
process.
◆ Even if the antenna tuning completes, there may be cases where
the Standing Wave Ratio is not 1:1 or less.
◆ If ANT1 is selected for the transceiver for use with an external
antenna tuner, the maximum transmit power is limited to 100
W. {page 4-21}
PRESET
Results of the tuning in each preset band can be stored in
the internal antenna tuner as preset tuning information.
While the internal antenna tuner is active, the preset
tuning information corresponding to the current transmit
frequency is applied to the internal antenna tuner.
1 Press [AT/TUNE].
• “AT>T” appears on the main screen. “R>” appears
while an external antenna tuner is active. The preset
tuning information corresponding to the current transmit
frequency is applied to the internal antenna tuner.
• If you change the transmit frequency, the preset
tuning information followed by the preset band will be
automatically configured for the internal antenna tuner.
• To deactivate the internal antenna tuner, press [AT/TUNE]
again.
Preset Band (MHz) for the Internal Antenna Tuner
0.03 to 1.85 14.10 to 14.50
1.85 to 2.50 14.50 to 18.50
2.50 to 3.525 18.50 to 21.15
3.525 to 3.575 21.15 to 21.50
3.575 to 3.725 21.50 to 25.50
3.725 to 4.1 25.50 to 29.0
4.1 to 6.9 29.0 to 30.0
6.9 to 7.05 30.0 to 51.00
7.05 to 7.1 51.00 to 52.00
7.1 to 7.50 52.00 to 53.00
7.50 to 10.50 53.00 to 60.0
10.50 to 14.10
Note:
◆ Even if the present frequency information is used, factors such as
rain on the antenna may increase the Standing Wave Radio. In this
a case, tune the frequency again until the Standing Wave Radio
drops.
CHANGING THE ANTENNA BEHAVIOR FOR
RECEPTION
You can pass received signals through the internal
antenna tuner. If the internal antenna tuner is active,
reception interference from adjacent frequencies may be
reduced.
[MENU] F[ADV.]
[F1] [F7]
1 Press [ADV.] (F) from the Menu screen to open the
Advanced Menu screen.
2 Access Menu 10, "Antenna Tuner during RX".
3 Press [SELECT] (F4) to allow editing of the parameter
box.
4 Press [-] (F4) or [+] (F5) to select “On” or “Off”.
The default is “Off” (not using the internal antenna tuner
during reception). Selecting “On” allows the use of the
internal antenna tuner during reception.
5 Press [ ] (F1).
6 Press [MENU] to exit.