:
....
_
...
)
?)Power Splitter Circuit
The excitation power supplied to J201 terminal from the exciter is applied to the
RF
transformer
T1
via
-2dB
attenuator circuit. ·
T1
is an impedance convert transformer (50 ohms : 12.5 ohms).
The excitation power
is
distributed to each
t~rminal
P21
to
P24.
2.2.3 CFF-361 Power Combiner
The CFF-361 power combiner is attached to the bottarn of the power amplifier unit.
. This circuit generates a 1 kW PEP
by
combining the output power from the power
amplifier of the four SEPP circuits.
These power amplifier output currents are combined by the RF transformers
T1
and
T2, and finally combined by T3.
As
the output impedance
of
T3 is 12.5 ohms, the step-up transformer T 4
is
converted
to 50 ohms.
Resistcrs
R1,
R2
and R3 absorb the unbalanced power generated at both ends of
each combining transformer.
R3
is equipped with a sensor R7 which detects temperature.
When a large unbalancing power is generated among these four power amplifier,
R3
produces heat to increase the resistance of
R7
and the PA BL alarm circuit is acti-
vated.
The circuit, consisting
of
a current transformer T5, diedes
CD1
and CD1, capacitors
C1
to
C4
and resistors
R51
to R54, detects Vf and Vr of the
poWer
combiner output
terminal.·
Vf and Vr issue the PA LOADalarm when the VSWR of the power combiner output
terminal
is
3.0 or more.Relay
K4
is turned
on
when the PA switch is on, and the com-
bined power
is
sent to the matehing circuit through this relay .
2.3 NBL-169 Power Supply Unit
The NBL-169 power supply unit is a regulated switching power supply whose power
output of DC 80 V is generated using AC 100 V to 240
V.
Because the pulse-shaped
current flows to capacitors in a smothing circuit in a power supply unit with a capaci-
tor-inputtype smothing circuit, the power factor of AC input is, in general, about 0.5 to
0.6.
The JRL-2000F has employed
apower
factor corrector circuit in the formerstage of
the switching regulator circuit to obtain a power factor of approx.1. ·
The CBB-13 power factor corrector is attached to one side of the heat sink which is in
the center of the unit, and the CBG-68 main PS unit
is
attached to the other side. The
unit also incorporates a switching power supply unit which generates a
DC
+ 12 V ( 4A)
power supply for the control circuit.
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