Volume 1
MIL-HDBK-162A
Section 2
15 December 1965
ITEM NAME: RADAR SET
TYPE: AN/APS-42
Receiver Recovery: Within 6 db of full
RELATION TO SIMILAR EQUIPMENT
sensitivity in less than 6 usec after
completion of any transmitter pulse
Electrically similar to Radar Sets AN/APS-42A and
for all settings of gain control.
AN/APS-42B.
Environmental Limitations:
Pressurized receiver-transmitter unit
TECHNICAL DESCRIPTION
Pulse Repetition Rate
Search: (5 to 10 mi and 30 mi) 800
pps, 0.75 usec pulse; (100 to 200
Transmitting: 9375 plus or minus 55
mi) 200 pps, 3.5 usec pulse.
mc
Weather: (All ranges) 200 pps, 3.5
Receiving: 9310 and 9375 mc
usec pulse
Range, Max: 200 naut mi
Type of Beams
Range, Min: 150 yd
Pencil (5.5 deg in both vertical and
Peak Power Output: 50 kw
horizontal plane)
Operating Voltages and Power Requirements
Cosecant Squared
ac: 115v, 380 to 420 cps, 1100 va max,
Equal-Energy-Return Beam: Beam width in vertical
single ph
plane is 37 deg between depression angles of
dc: 28v, 100w
between 3 and 40 deg with antenna tilt set
Type of Presentation: PPI
at 0 and aircraft at 10,000 ft. Horizontal side
Number and Interval of Range Markers:
lobes are down 25 db from max amplitude.
Range
Range
Spacing
Type of Presentation: Offset sector
Markers
(miles)
Scan and Sector Scan: 360 deg
5
2
2
Azimuth Scan: Full, 120 deg, or 240 deg
10
5
2
Accuracy: Sweeps on indicator tube are
30
6
5
within 1 deg of antenna position.
100
4
25
200
8
25
INSTALLATION CONSIDERATIONS
Duty Cycle:
0.00065
Sensitivity
Related Equipments: (Required but not
Search Operation: 98 db min below 1
Supplied) (1) Pressurizing Kit
mw with IF. band width of 3 mc.
MK-59/AP.
Beacon Operation: 96 db below 1 mw
PRINCIPAL COMPONENTS AND PHYSICAL DATA
COMPONENT
QTY
HEIGHT
WIDTH
DEPTH
UNIT WT.
(Inches)
(Inches)
(Inches)
(Pounds)
Radar Receiver-Transmitter
1
19 dia
24
66
RT-156/APS-42
Amplifier AM-442/APS-42
1
5
4
3
*
Amplifier AM-443/APS-42
1
3
3
9
*
Control C-524/APS-42
1
8
4
4
*
Suppressor, Electrical Noise
1
6
3
6
4
F-148/APS-42
Range-Azimuth Indicator
1
8
8
14
22
IP-35/APS-42
Mounting MT-639/APS-42
1
12
2
24
2
Synchronizer
1
11
8
20
38
SN-59/APS-42
Antenna AS-428/APS-42
1
18
35
21
49
NOTE: *Weight included with RT-156/APS-42
AN/APS-42: 2
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