Rx Antenna; Drive Output (Drv); Internal Antenna Tuner; Securing The Matching To The Antenna - Kenwood TS-990S Instruction Manual

RX ANTENNA

You can select an antenna to be dedicated for reception.
To operate the transceiver with an antenna dedicated for
reception, such as an HF low band Beverage antenna or a
directional loop antenna, you must connect the antenna to
the RX IN connector on the rear panel.
F[ANT]
1 Press [RX ANT].
Each key press toggles the antenna for the selected
operating band between active and inactive.
While active, "RX" appears on the main screen.
If the same antenna (ANT1 to ANT4) is configured for the
main band and sub band, the RX antenna for the deselected
band is also changed.
DRIVE OUTPUT (DRV)
The frequency ranges that can be output from the Drive
(DRV) jack are 135 kHz (135.700 kHz to 137.799 kHz)
and the 1.9 to 50 MHz amateur bands. Output level is 1
mW (0 dBm).
REMOTE connector
(Viewed from the rear panel side)
$
* .
Connection with a
RL
# -
+ ,
Coaxial Cable
ALC GND
Output Power
1 mW (0 dBm)
1 Press [DRV].
• The "DRIVE" LED lights green.
• If the transmit signal is sent from the DRV connector,
no signal can be transmitted from the ANT1 to ANT4
connectors.
• Following the configuration in Advanced Menus 11 (Linear
Amplifier Control (HF Band)) and 12 (Linear Amplifier
Control (50 MHz Band)), +12 V is sent from pin 7 (RL) of
the REMOTE connector.
• The PWR meter is inactive while transmitting from the
DRV connector. The automatic control circuit activated
when voltage is applied to pin 6 (ALC), of the REMOTE
connector, and the status of the automatic control circuit
appears on the ALC meter.
Contents Index
Linear Amplifier (Typical Input 1 m W)
AMP
Detection
TX
Circuit
Control Voltage
＋12V
ALC Voltage
Note:
◆ Be sure that the connection for use with the drive output is in place,
as described above.
◆ Rotate the PWR control to reduce the transmit power.

INTERNAL ANTENNA TUNER

As explained in "ANTENNA INSTALLATION AND
CONNECTION", you will have the best performance when
matching the impedance of the coaxial cable with the
antenna. {page 1-1}
To adjust the impedance between the antenna and the
transceiver, use an external antenna tuner or the internal
antenna tuner.
F[ANT]
[AT/TUNE]

SECURING THE MATCHING TO THE ANTENNA

1 Select the transmit frequency.
2 Press [ANT] (F) to select the antenna.
• Ensure that "ANT 2" has been selected if the internal
antenna tuner will be used and if the external antenna has
been connected to the ANT1 connector.
• If the external antenna has been connected to the ANT1
connector, the internal antenna tuner cannot be used with
"ANT1" selected.
3 Press and hold [AT/TUNE] to tune.
• The transceiver is placed in CW mode, and tuning begins.
The transmit power will be "10 W", the SWR meter will be
selected as the transmit meter.
• After the tuning has completed, the blinking ">T" lights.
While the antenna tuner is enabled during the reception,
the blinking "R>" also lights.
• To stop tuning, press [AT/TUNE] again.
• If the Standing Wave Ratio of the antenna is extremely
high, such as 10:1 or higher, a Morse code "SWR" alert
sounds and the internal antenna tuner turns off.
• Adjust the antenna system to lower the Standing Wave
Ratio before tuning again.
BASIC OPERATIONS 4
4-21