Volume 1
MIL-HDBK-162A
Section 2
15 December 1965
ITEM NAME: RADAR SET
TYPE: AN/APN-81
source.
RELATION TO SIMILAR EQUIPMENT
Pulse Repetition Rate: 50 kc
Similar to the AN/APN-t39 and AN/APN-tt2.
Frequency Modulated: 63 cps
TECHNICAL EQUIPMENT
Probable Accuracy
Frequency: 8700 to 8900 mc
Ground Speed: plus or minus 2.5 knots below
Range, Max: 70,000 ft
250 knots, plus or minus 1% actual speed at
Range, Min: 500 ft
higher speeds.
Peak Power Output: 35w
Drift Angle: plus or minus 0.5%;
Operating Voltages and Power Requirements:
Wind Speed: plus or minus 3 knots or 2% of
115 plus or minus 5v ac, 380 to 1000
wind speed, whichever is greater.
cps, 3-ph, 1200w max
Wind Direction: Varies with wind speed. Typical
115 plus or minus 5,v ac, 360 to 420
extremes - plus or minus 1.1 deg error at a
cps, 1-ph, 500w max
wind speed of 215 knots, plus or minus 120
26.4 plus or minus 2.5v dc, 100w
at a wind speed of 13 knots.
Type of Presentation: Meters
INSTALLATION CONSIDERATIONS
Duty Cycle: 0.0,15
Not available.
Environmental Limitations: Pressurized
components require a forced air cooling
PRINCIPAL COMPONENTS AND PHYSICAL DATA
COMPONENT
QTY
HEIGHT
WIDTH
DEPTH
UNIT WT.
(Inches)
(Inches)
(Inches)
Antenna AS-618A/APN-81 or
1
15
17
28
42.8
AS-618-C/APN-81
Radar Receiver-Transmitter
1
17
17
24
87.5
RT-274A./APN-81* or
RT-274B/APN-81* or
RT-27 IC/APN-81*
Computer Frequency Tracker
1
10
10
19
33.6
CP-185/APN-81* or
CP-185A/APN'-81* or
CP-185B/A PN-81*
Amplifier, Electronic Control
1
14
14
24
63.4
AM-742/APN-81* or
AM-742/APN-81*
Amplifier, Electronic Control
1
7
8
11
9.4
AM-743/APN-81*
Amplifier, Electronic Control
1
17
17
24
89.5
AM-T58A/APN-81* or
AM-T5t3B/APN-81*
Control, Vertical Gyro
1
8
7
9
8.3
C-1160/APN-81*
Control, Radar Set
1
6
4
4
1.3
C-1195 /APN -81
Directional Coupler
1
3
3
7
0.25
CU-323 /APN-81
Control, Radar Set
1
6
6
5
3
C-1416/APN-81 or
C-14116A/APN-81
Interconnecting Box
1
4
4
7
2
J-605/APN-81 or
J-605A/APN-81
Interconnecting Box
1
11
6
16
24.5
J-607/APN-81*
Interconnecting Box
1
9
5
11
6.8
J-608/APN-81*
Interconnecting Box
1
6
3
16
1.2
J-518/APN-81
Indicator, Drift Angle
1
4
4
4
1.2
ID-3.12/APN'-81
AN/APN-81: 2
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