Table 1-2. Capabilities and Limitations (Sheet 4 of 6)

TO 31R2-2GRC171-2

TM 11-5820-815-14

NAVELEX 0967-LP-544-5010

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

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.

TRANSMITTER

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