Quantcast Section III. ANTENNA COUPLER CU-2229/URC-92 FUNCTIONAL OPERATION

 

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Filter  Module  1A5 Detailed Functional Operation
Up
TM-11-5820-873-34 Radio Set AN/URC-92 (NSN
Next
Figure 2-4. Antenna Coupler Control Unit Schematic Diagram.


TM 11-5820-873-34
1A5A4L2 and 1A5A4C6) make up the ACC detector.
each of the four filter module boards.  Wafer switch
Variable capacitor 1A5A4C13 tunes the circuit for heat
1A5A4S1 rotates until the open position reaches the
operation. The detector output at this point has a fast
hand position supplying the + 12 V. At that point + 12 V
rise/fall time. To maintain a constant carrier level the
is removed from switch 1A5A4-8 and relay 1A5A4K1
detector output is fed to an averaging network on the
deenergizes. The 1A5A4B1 motor input switches from +
receiver/exciter sideband generator board.
12 V to ground through normally closed contacts, 1 and
f.  Level Detector.  A forward power level and a
9, of 1A5A4K1.  This quickly stops the motor and
prevents excessive overshoot.
Diode 1A5A4CR1
reflected power level (VSWR) are the two level detector
prevents motor back emf from keeping 1A5A4K1
outputs.
The forward power level is obtained by
energized. With the motor stopped, all wafer switches
sampling the signal at the antenna connector of the filter
are set to provide the correct filtering for the selected
module.  The signal level is dropped by a voltage
band.  A filter, capacitors 1A5A4C1, 1A5A4C2 and
divider 1A5A4R1 and 1A5A4R2), and developed by
inductor 1A5A4L1, prevents noise on the motor input
detector 1A5A4CR5.
A filter network (1A5A4C3,
line.
1A5A4R3 and 1A5A4C4) then smoothes the signal for
c.  Receiver Protector.  Diodes 1A5A4CR18 and
use by the front panel power monitor.  The reflected
power level is used to protect the RF power amplifier.
1A5A4CR19 form a shunt power limiter to protect the
The level of reflected power (VSWR) is derived
receiver front end from excessive power input.
inductively (1A5A4T1 and 1A5A4R20) from the signal to
d. Voltage ALC Detector.  The ALC (Automatic
the antenna connector on the filter module. The VSWR
Level Control) detector is the sensing circuit for the ALC
is developed by diode 1A5A4CR16 and filter network
circuitry that limits the peak power output to 100 watts.
1A5A4C22, 1A5A4L4 and 1A5A4C23. If the VSWR is
It  provides  an  output  reference  voltage  to  the
less than 1.7 to 1 no output (VSWR ALC) is generated.
receiver/exciter for use in the IF stages for output level
g. Keyline. The filter module also contains some of
control. The voltage ALC detector consists of a voltage
the components necessary for transmit keying. Refer to
divider (1A5A4R25 and 1A5A4R26) and RF detector
(1A5A4CR17), and emitter followers 1A5A4Q2 and
1A5A4Q3.  Capacitor 1A5A4C28 filters out any audio
2-11. Antenna Coupler Control Unit 1A2 Detailed
modulation and variable capacitor 1A5A4C24 tunes the
Functional Operation (Fig. 2-4).
circuit for best performance over the transceiver
This unit contains the controls and indicators necessary
frequency range.
for the operator to check, select and monitor antenna
e. ACC Detector.  The ACC (Automatic Carrier
tuning.  Meter 1A2M1 indicates either reflected or
Control) detector provides a carrier sampling to the ACC
forward power as selected by REFL FWD POWER
circuitry for control of AM power output.  The ACC
MONITOR switch 1A2S1.  The TUNE START switch
detector derives its output by sampling the signal at the
initiates a coupler tune cycle when depressed if the
antenna connector of the filter module.  A voltage
radio set has been set to CPLR TUNE KW.  The
divider (1A5A4R4 and 1A5A4R5), a rectifier (1A5A4CR6
COUPLER STATUS indicators provide Antenna Coupler
and 1A5A4CR12), and a filter network (1A5A4C5,
operating condition indications.
Section III. ANTENNA COUPLER CU-2229/URC-92 FUNCTIONAL OPERATION
2-12. Simplified Overall Operation
NOTE
Any  time  the  red  FAULT  light
The CU-2229/URC-92 antenna coupler is located near
illuminates, it is an indication that
the antenna base and provides automatic antenna
the antenna coupler should be tuned
tuning. Operation is controlled by the antenna coupler
control mounted in the front panel of the RT1277/URC-
In a tune cycle, a demodulated RF is supplied to phase
92 transceiver. Automatic tuning is accomplished by a
and amplitude detectors.  These detectors generate
variable inductor and a variable capacitor.  Auxiliary,
error signals proportionate to the impedance and phase
fixed value, capacitive circuits are also switched in and
differences of the RF line.  The error signals are
out as necessary by relays. When automatic tuning is
differentiated and amplified to drive the DC motors that
initiated at the control unit, a tuning cycle begins The
control 2C1 and 2L4.
green READY light, on the control, illuminates when the
cycle is complete.
2-15


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