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(4)Output Power Detector Circuit
The output power detector circuit detects Vf and Vr of the matching circuit output
terminal.
Capacitors C201 and C202 detect the voltage of the output terminal and transformer
T2 detects current.
Diodes CD201 and CD202 detect the forward voltage (Vf) and the reflected voltage
(Vr)
Vf and Vr are sent to the CDJ-1143 control circuit where the VSWR value is calcu-
lated, and then they are displayed in the voltmeter on the front panel.
2.5 CSC-433 Antenna Switch
The CSC-433 antenna switch is a relay circuit which switches RF signals and is con-
trolled by the CDJ-1143 control CPU. Connector J1 is an input terminal of the RF
power which is sent from the exciter. J2-1 to J2-4 are the output terminals to which
four antennas can be connected.
Resistors R1 and R2 detect the exciter output power and send it to the CDJ-1143 via
J303.
The contact of the relay K8 becomes open state during receiving state.
Depending on the mode used, each relay operates as follows.
(1) In the Antenna Switch Mode
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