Volume 1
MIL-HDBK-162A
Section 2
15 December 1965
AN/APN-99A
Duty Cycle: .045
The provides true ground speed and drift angle
Environmental Limitations: The computer set is
information of high accuracy.
designed to operate within the limits of 70 deg N
and 70 deg S latitude and at speeds of 70 to
2,000 knots. The distance from present position
RELATION TO SIMILAR EQUIPMENT
to destination at any time during operation
cannot exceed 1, 000 naut mi. At latitudes of
Similar to Radar Navigation Set AN/APN-82( ),
more than 70 deg the computer operates
except that the AN/APN -99A computes and indicates
transverse coordinates and with transverse
the additional information of course and distance to
readings instead of the conventional coordinates
destination.
used in lower latitudes.
Same as the AN/APN-99 except the AN/ASN-7A is
The AN/APN-99A is a pressurized set and
a transistorized version of the AN/ASN-7.
requires a forced cooling source.
Pulse Repetition Rate: 50 kc
Modulation: 63 cps, FM
TECHNICAL DESCRIPTION
Ground Speed Accuracy: 2.5 knots below 250
knots, ,10o of actual speed at speeds greater
Frequency: 8700 to 8900 mc
than 250 knots.
Range, Max: 70, 000 ft
Drift Angle Accuracy: +0. 5%
Range, Min: 500 ft
Wind Speed Accuracy: -3 knots or 2qC of wind
Peak Power Output: 35w
speed, whichever is greater
Operating Voltages and Power Requirements:
115 vac, 1-ph, 380 to 420 cps, 750w
INSTALLATION CONSIDERATIONS
115 vac, 3-ph, 380 to 1,000 cps, 1,300w
22 vdc, 100w
Type of Presentation: Meters
Not available.
PRINCIPAL COMPONENTS AND PHYSICAL DATA
COMPONENT
QTY
HEIGHT
WIDTH
DEPTH
UNIT WT.
(Inches)
(Inches)
(Inches)
(Pounds)
Antenna AS-618A/APN-81
1
17
15
28
42.75
Radar Receiver-Transmitter
1
17
17
24
87.50
RT-274A/APN-81
Frequency Computer
1
10
10
19
33.62
CP-185/APN-81
Electronic Control Amplifier
1
14
14
24
63.37
AM-742/APN-81
Electronic Control Amplifier
1
8
7
11
9.37
AM-743/APN-81
Electronic Control Amplifier
1
17
17
24
89.5
AM-758/APN-81
Vertical Gyro Control
1
7
8
9
8.25
C-1160/APN-81
N-1 Compass System
1
6
5
5
3.75
Directional Coupler CU-323/APN-81
1
3
3
7
0.25
Drift Angle Indicator ID-342/APN-81
1
4
4
4
1.12
Ground Speed Indicator
1
4
4
6
1.12
ID-341/APN-81
AN/APN-99A: 2
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