Kenwood AT-120 Operating Manual page 7

Adjusting the Antenna Coupler
The antenna coupler is used to match a trans-
mitter to an antenna system when its SWR is too
high (i.e., greater than 1.5:1 SWR).
a.
Place the BAND switch to the same band,
setting as your transceiver (as shown in Figure
8).
. Set the CAL/SWR switch to the CAL (BL)
position.
Transmit and adjust the CAL control so the
meter indicates CAL.
. Place the CAL/SWR switch in the SWR (=)
position.
Now you will measure the reflected power.
Adjust the R TUNE and X TUNE controls
alternately for a good minimum meter indica-
tion. Reflected power will be close to zero as
a good match is achieved.
Table 1 shows control positions for coupler ad-
justment.
Table 1.
BAND (MHz) R TUNE X TUNE
"to 1
3.5 4.0 5.0
c 7 4.9 48 |
fan mm— |
14 7.0 7.8
| 8.1 8.1 |
28 8.2 8.1
TS-820 or other
B. ANT System
A. Dummy load
Ce
ee
ANT First tune up on
Dummy load.
Then check
| antenna SWR.
Adjust match if
| necessary.
Figure 7. Connection
Adjust alternately for mi
SWR reading.
CAL
~m SWR
LAMP PULL-ON = Qos ene
Figure 8.
"en