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Table 1-2. Capabilities and Limitations (Sheet 3 of 6)
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TM-11-5820-815-14 Service and Circuit Diagrams RADIO SET AN/GRC-171 Manual
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Table 1-2. Capabilities and Limitations (Sheet 5 of 6)


TO 31R2-2GRC171-2
TM 11-5820-815-14
NAVELEX 0967-LP-544-5010
Table 1-2. Capabilities and Limitations (Sheet 4 of 6)
CHARACTERISTIC
SPECIFICATION
RECEIVER (Cont)
Audio level regulation
4-dB or less decrease in audio output voltage level (100-milliwatt
output reference for 600-ohm load resistor) for a 5-to-1 reduction
(120 ohms) in load resistor.
Automatic gain control (AGC)
3-dB or less change in audio output level (100-milliwatt output
reference for 6-microvolt input signal, modulated 30%) as the input
signal increases from 6 microvolts to 1 volt.
AGC time constant
100-millisecond attack time, 500-millisecond release time.
Squelch
A carrier-operated noise silencer mutes the receiver output pending
application of carrier inputs not greater than 3 microvolts with squelch
sensitivity at maximum setting and not less than 50 microvolts with
squelch sensitivity at minimum setting.
Carrier-operated relay
A spdt relay operates in synchronism with the squelch circuit for use
with external devices.
Noise blanker
A noise blanker circuit reduces the presence of impulse noise at the
receiver audio output when rf pulses with the following characteristics
are introduced into the receiver input.
PULSE
PULSE
PULSE
WIDTH
REPETITION FREQUENCY
SHAPE
10 2 s
360 60 prf
Rise and decay time
less than 1 s
2 1 s
900 600 prf
Rise and decay time
less than 0.1 s
NOTE
Noise blanker can be disabled by a noise blanker strapping option
on receiver rf module A3, or by grounding the external noise
blanker disable line of rear panel connector J22 pin j, or by
installing the wide bandwidth filter (A4FL1) which has a special
noise blanker disable pin.
Hum and noise
Not less than 50 dB below the rated audio output level of 100 milliwatts.
Power output
20 watts into a 50-ohm resistive load throughout the frequency range
225 to 399.975 MHz.
NOTE
The transmitter power output will automatically reduce to approxi
mately 4 watts if the pa heat-sink temperature exceeds 100 C, or
if the antenna vswr exceeds 3.1, or if the rf filter insertion loss
increases above approximately 2 dB.
1-7


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