(4)0utput Power Detector Circuit
The output power detector circuit detects Vf and Vr of the matehing circuit output
terminal. ·
Capaeiters
C201
and C202 detect the voltage
of
the outputterminal and transformer
T2 detects current.
Diedes 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
inputterminal
ofthe
RF
power which
is
sent from the exciter.
J2-1
to J2-4 are the output terminals to which
four antennas can be connected.
Resistcrs
R1
and
R2
detect the exciter outputpower and send it to the CDJ-1143 via
J303.
The contact of the relay
KB
becomes open state du ring receiving state.
Depending on the mode used, each relay operates as follows.
(1)
ln
the Antenna Switch Mode
11
Kl
K2
Fig.6
14
0-----@
ANT3
o--------0
ANT
4
K4to
K7
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