Kenwood AT-130 Instruction Manual page 9

Figure 11 shows a block diagram of the AT-1 30.
Direcltional Coupler
The directional coupler samples forward and
reflected power from the transceiver to the load.
Meter Circuit
The forward and reflected power sampled by the
directional coupler is used for SWR measure-
ment. Forward power i s calibrated with the CAL
control so reflected power is read as SWR.
Band Selector Switch
This selects the band to which the matching
circuit is tuned. In the "THROUGH" position,
Idthe antenna i s connected directly to the trans-
-
ceiver, bypassing the coupler, while s t i l l allowing
SWR measurement.
Antenna Coupler
The universal matching circuit is capable of
matching 20 t o 300n loads to the 50a
input
impedance.
1
ANTENNA
COUPLER
INPUT
I
METER
CIRCUIT
@
n
A N T G N D
Figure 4-1. AT-130 Block Diagram
i
DIREC-
T I O N A L
COUPLER
-c
BAND
SELEC---c
TOR