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Table 5-2. Test Points (Sheet 2 of 4)
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TM-11-5820-815-14 Service and Circuit Diagrams RADIO SET AN/GRC-171 Manual
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Figure 5-1. Radio Receiver-Transmitter RT-980/GRC-171, Test Point Location


TO 31R2-2GRC171-2
TM 11-5820-815-14
NAVELEX 0967-LP-544-5010
Table 5-2. Test Points (Sheet 3 of 4 )
REFERENCE
MODULE TO WHICH
DESIGNATION
TEST POINT
FUNCTION
TEST POINT APPLIES
A10A1TP4
PLL OUT
Provides sample of frequency
Frequency synthesizer A2
synthesizer phase-locked loop
output level. Voltage will be
+ 0.5 to + 1.5 V dc.
A10A1TP5
PLL FAULT
Provides sample of frequency
Frequency synthesizer A2
synthesizer lock monitor output.
Voltage will be + 2.0 to + 5.0 V
dc (locked) and 0 to + 0.5 V dc
(unlocked).
A10A1TP6
PA FWD PWR
Provides sample of power ampli-
Power amplifier A8
fier power output. Voltage will
be + 0.5 to + 1.2 V dc (16 to 24
watts).
A10A1TP7
PA RE FLD PWR
Provides sample of reflected
Rf filter A7 and power amplifier A8
power at the power amplifier.
Voltage will be - 0.3 to + 0.3
V dc (1:1 vswr) and + 0.7 V dc
(3:1 vswr).
A10A1TP8
ALC
Provides sample of power
Power amplifier A8
amplifier automatic load
control voltage. Voltage will
be + 0.5 to + 2.5 V dc (keyed)
and + 12 V dc (unkeyed).
A10A1TP9
KEY
Provides sample of key 2 out-
Audio A4
put. Voltage will be + 0.05 to
+ 0.5 V dc (keyed) and + 3.8 V
dc or greater (unkeyed).
A10A1TP10
RCV AUDIO
Provides sample of receiver
Receiver rf A3
audio output. Voltage will be
0.16 to 0.3 V rms.
A10A1TP11
XMT AUDIO
Provides sample of audio
Audio A4
module output (to modulator).
Voltage will be 0 to 1.1 V
rms.
A10A1TP12
IF AGC
Provides sample of AGC
Receiver rf A3
SQUELCH voltage. Voltage
will be + 0.3 to - 0.7 Vdc
(receive) and greater than
+ 0.6 V dc (transmit).
A10A1TP13
RECT DC
Provides access to transformer
Chassis A10
rectifier output. Voltage will be
+ 21 to + 60 V dc.
A10A1TP14
GND
Return for all front panel test
points.
A10W2J1/
ANT-XCVR
Provides access to transmitter
Receiver rf A3, frequency
A10W3J2
output or point of injection for
synthesizer A2, and
receiver test signal.
power amplifier A8
5-5


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