Kenwood AT-130 Instruction Manual page 7

Adjusting the Antenna Coupler
The antenna coupler is used to match a trans-
mitter to an antenna system when i t s 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
3-41,
b. Set the CALISWR switch to the CAL
( I )
position.
c. Transmit and adjust the CAL control so the
meter indicates CAL.
d. Place the CALISWR switch in the SWR
( , )
position.
e.
Ncw 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 3-1 shows approximate control positions
for coupler adjustment.
Table 3-1
I
BAND(MHz1
I
R TUNE
I
X TUNE
I
- -
- p
B. A N T System
A. D u m m y load
TS-820 o r other Transceiver
f - -
1 I
I
. -
. - a
~.
-
1
-
-
0 0 0
A T - 120 ANT
First tune u p o n
- -
I i
o o ! l
I A D u m m y load.
4
1
Then check
I 1 9 M
-
I I o o o l l I!
-
-
l l
_
..
.
. -
antenna SWR.
necessary.
r 7 1
- --
.~
Coax.
INPUT
Coax.
G r o u n d Cable
Figure 3-3. Inter Connection
-Adjust alternately f o r m i n i m u m
4
SWR reading.
BAND R TUNE
X TUNE
PULL LAMP
@
ANTENNA TUNER AT- 130
c
. ' ,
Figure 3-4.