Figure 4-6. Medium-gain antenna AS-3567( )/PSC-3.
2. The vehicular NCS AN/VSC-7 uses the basic AN/PSC-3 R/T unit installed in a C-1119( )/VSC-7 control
converter which is shock-mounted into a communications shelter or a military ground vehicle. Power to the
NCS is derived from the vehicle's electrical system. It may also be used with an S-280 communications shelter
mounted on an M-832 mobilizer. The power amplifier module in the control converter is blower-cooled to
allow continuous key-down operation at temperatures up to 86€C (155€F). The NCS can serve up to 15
AN/PSC-3( ) terminals in a communications net with the selection of conference or individual call-codes
available at the control converter front-panel. The NCS uses a high-gain (9 dB) AS-3566( )/VSC-7 antenna and
a low-gain whip antenna (Figure 4-7). The low-gain AS-3566( )/G whip antenna is used for LOS operation and
for CALL reception. The AS-3567( )/PSC-3 medium-gain antenna, used for satellite relay operation, provides 6
dB gain in the frequency range of 240 to 318 MHz and 5.5 dB gain in the frequency range of 318 to 400 MHz.
Terminal characteristics include all features of the AN/PSC-3( ) and additionally provide
Operation from vehicle electrical system
Transmission of selective or conference call signals
Input-power conditioning ,
Automatic transmission/reception mode changeover
SS0031
4-10
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