Figure 11 shows a block diagram of the AT-130.
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 is 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 is connected directly to the trans-
-ceiver, bypassing the coupler, while still allowing SWR measurement.
Antenna Coupler
The universal matching circuit is capable of matching 20 to 300n loads to the 50a input impedance.
| 1 |
| |
INPUT DIREC- | BAND | ANTENNA | |
T I O N A L | |||
COUPLER | |||
COUPLER | TOR | ||
|
I
METER
CIRCUIT @ n
A N T G N D
Figure 4-1. AT-130 Block Diagram
i
