Kenwood AT-120 Operating Manual page 5

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SECTION 2. CONTROLS AND THEIR FUNCTIONS
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ANTENNA TUNER AT-120
Figure 3. Front view
1. Meter
The meter reads SWR (standing-wave ratio) and
is illuminated (external power required).
2. CAL (Calibrate)/SWR Switch
To measure SWR, first set this switch to the
CAL (§) position. Adjust the CAL control until
the meter pointer swings to the CAL line on
the meter scale.
Then depress the switch to the SWR (m) position,
and read the SWR.
3. CAL (Calibrate) Control/Meter Lamp Switch
Before measuring SWR, this control is used to
calibrate the meter. Adjust as described above
item 2, The meter lamp lights when the control
is pulled on.
4. BAND Switch
Set this switch to the band in which you are
operating. The BAND = switch also has a
"THROUGH" position at which the antenna is
connected directly to the transceiver. SWR can
also be measured at the THROUGH position.
CAUTION: DO NOT operate the band switch
while transmitting.
damage WILL occur.
Equipment
5. R TUNE
The R TUNE adjusts the resistive component of
antenna impedance.
6. X TUNE (Transmit Tuning) Control
The X TUNE adjusts the reactive component of
antenna impedance.
Figure 4. Rear View
1. INPUT Connector
The INPUT UHF connector accepts the HF input
signal fed from the antenna connector on the
transceiver.
2. ANT Connector
The ANT UHF connector accepts the antenna
coaxial cable.
3. GND post
Connect the GND post to the transceiver GND
stud. Use as short a cable as possible, using the
supplied ground lug.
4. 12 VDC
Accepts 12 VDC for meter illumination. Use the
supplied plug.
NOTE: Viewed from the rear, the right terminal
is POSITIVE.
5. Serial No. Plate
This plate is stamped with the Serial Number of
your unit.