Kenwood AT-130 Instruction Manual page 6

Measuring antenna system SWR
(i) Using an all solid-state transceiver (such a s a
TS-130s or TS-130V)
Before setting up the antenna coupler, first
determine the antenna system SWR.
a.
Set the controls as shown in Figure3-2. Set the
BAND switch to the "THROUGH" position.
b. In the transmit mode, calibrate the meter with
the calibration control.
c. Depress the CALISWR switch to the SWR
( 1 )
position and read SWR. If the SWR is lower
than 1.5: 1 the antenna system impedance
i s sufficiently matched for practical use. If
above 1.5: 1, tune the system.
NOTE: In the event of too high an SWR (over
10: I), check the antenna system for
breaks or a short circuit.
(ii)Using a tube power amplifier transceiver (such
as a TS-820)
Connect the transceiver (or transmitter) and
dummy load (or antenna) through the AT-1
30
as
shown in Figure 3-3. Before adjusting the antenna
coupler, you should first know the antenna sys-
tem SWR.
Connect the dummy load to the ANT connector
and adjust the transceiver (or transmitter) final
tuning. Then, replace the dummy load with the
antenna and measure the antenna-system SWR.
NOTE: During antenna measurements, your
transceiver may be operating under
heavy loading conditions.
e l
Your signal may also interfere with
other stations. Use the least amount of
power possible, and complete measure-
ments a s quickly a s possible.
Ground lead
Figure 3-1. Interconnection
Coax.
T
I:
BAND R TUNE
CAL
PULL LAMP
@
ANTENNA
k
1
1
Switch out set
CAL ( control
Figure 3-2. Switch Settings
6
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