Volume 1
MIL-HDBK-162A
Section 1
15 December 1965
ITEM NAME: SIMULATOR-RADAR SELECTOR GROUP
TYPE: AN/GPA-112(V)
Pulse Width: 1 to 5 usec
by the Radar Selector Group permit the selection of one
Rise Time: 30% of pulse width
of three equipment modes of operation.
Characteristic Impedance: 72 ohms
RELATION TO SIMILAR EQUIPMENT
RP Pulses: Reference pulses
None.
(characteristics as defined)
TECHNICAL DESCRIPTION
Timing Data Transfer
Operating Power Requirements: 120/208v ac, 60 cps,
(These signals must exhibit the characteristics defined)
3 ph, 4-wire (floating neutral), 300 w 28v dc, 47 w
Polarity: Unipolar - positive
(max)
Amplitude: 35 plus or minus 15v (peak)
Equipment Compatibility
Rise Time: 0.3 usec (maximum)
Main I-F
Pulse Width: 0.5 to 5.0 usec
Center Frequency: 30 plus or mius 0.025 mcps
Characteristic Impedance: 72 ohms
Bandwidth: plus or minus 3 mcps at 1 db below
Video Transfer Compatibility
peak amplitude
Processed video
RMS Noise Level: 500 mv
Bandwidth: 40 cps to 1 mcps at 3 db points
Signal Range: Linear at least 60 db above rms
Polarity: Unipolar - positive
noise
Amplitude: 1v to 4v, clipped level
Characteristic Impedance: 50 ohms
RMS Noise: 0.25 to 0.75 of video clipped level
Coho I-F
Characteristic Impedance: 72 ohms
Center Frequency: 30 plus or minus 0.025 mcps
Selective identification feature (SIF) video
at 1 db below peak amplitude
Polarity: Unipolar - positive
Amplitude: 0.1v peak-to-peak
Amplitude: 2.5 to Sv (peak)
Pulse Width: 10 usec
Pulse Width: O.4 to 0.6 usec
Characteristic Impedance: 50 ohms
Rise Time: 0.1 usec (maximum)
Modes of Operation
Characteristic Impedance: 72 ohms
(manual selection (remote capability))
Moving target indicator (MTI) video
Operational Mode: Normal radar i-f and coho i-f are
Polarity: Unipolar - positive
processed into system video and fed to the data
Amplitude: 2.5 to 5v (peak)
processing and display equipment.
Pulse Width: 0.1 to 0.6 usec
Simulation Mode: Simulated radar i-f and coho i-f
Rise Time: 0.1 usec (maximum)
signals are substituted for normal radar signals.
Characteristic Impedance: 72 ohms
Simulated radar video is fed to the data
Main lobe indicator (MLI) video
processing and display equipment. Azimuth
Polarity: Unipolar - positive
reference signals can be selected from radar or
Amplitude: 2.5 to 5v (peak)
simulators.
Pulse Width: 0.4 to 0.6 usec
Operational and Limited Simulation Mode: Normal
Rise Time: 0.1 usec (maximum)
radar i-f and coho i-f are processed into system
Characteristic Impedance: 72 ohms
video and fed to the data processing and display
INSTALLATION CONSIDERATIONS
equipment. Additional simulated videos may be
Siting: The Selector Cabinet must be located near
selected and mixed with real target video for
Electrical Filter Assembly F-585/GPA-73(V) and
presentation by the data processing and display
Radar Signal Simulators AN/GPS-TB and
equipment.
AN/GPS-T6 in order to restrict the length of
Positional Data Transfer
cabling required to interconnect these units.
Analog Signals (Synchro)
Cabling Requirements: Power and signal cables
Reference Signal: 120v dc, 60 cps, 1, 2-wire (1
must be separated by a distance of at least 1B
and 36 speeds)
inches. Cable crossing should be avoided;
Stator Signals (2): AM modulated 0-90v ac, 60
however, when necessary, cables must cross at
cps, balanced connections, 3-wire (1 and 36
right angles. Additional power and signal cables
speeds)
required to complete the Radar Selector Group
Digital Signals
installation must be fabricated at the site from
ACP Pulses: Azimuth change pulses
bulk cable stock.
Polarity: Unipolar - positive
Amplitude: 35 plus or minus 15v (peak)
AN/GPA-112(V): 2
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