Volume 1
MIL-HDBK-162A
Section 2
15 December 1965
ITEM NAME: RADAR SET
TYPE: AN/APN-108
max 18 deg per sec
RELATION TO SIMILAR EQUIPMENT
Probable Accuracy
The AN/APN-108 is comprised of components of the
Groundspeed: plus or minus 2.5 knots at
AN/APN-81 and AN/APN-89A Radar Sets.
speed below 250 knots. Plus or minus
1% of actual speed at higher speeds.
TECHNICAL DESCRIPTION
Drift Angle: plus or minus 0.5 deg
Limits of Operation
Required Inputs:
Altitude: Min 200 ft, max 70,000 ft
Two sources, 3-wire heading information;
Groundspeed: Min 70 knots, max 700 knots
shaft speed ratio to be 25/1 memory
Acceleration without Signal Loss, G's:
mode drift error correction
Max 0.7
memory mode groundspeed (variable gain)
Drift Angle: min 0 deg max 49 deg
correction, variable gain potentiometers
Aircraft Pitch Without Loss of Signal
excitations
Nose Up: Min 0 deg, max 24 deg
Power Requirements: 108 - 120v ac, 380 -
Nose Down: Min 0 deg, max 14 deg
400 cps, 3-ph, 1900w; 28v dc, 65w
Aircraft Roll Without Loss of Signal
Right Wing Down: Min 0 deg, max 14 deg
Left Wing Down: Min 0 deg, max 14 deg
INSTALLATION CONSIDERATIONS
Aircraft Pitch Rate: Min 0 deg per sec,
Not available.
max 18 deg per sec
Aircraft Roll Rate: Min 0 deg per sec,
max 18 deg per sec
Aircraft Yaw Rate: Min 0 deg per sec,
PRINCIPAL COMPONENTS AND PHYSICAL DATA
COMPONENT
QTY
HEIGHT
WIDTH
DEPTH
UNIT WT.
(Inches)
(Inches)
(Inches)
(Pounds)
Antenna AS-11O1/APN-89A
1
13-5/8
15
28-1/8
46
Receiver-Transmitter
1
16-7/8
16-1/4
23-5/8
90
RT-528/APN-89A
Mounting MT-1216/APN-81
1
Amplifier, Electronic Control
1
16-7/8
16-1/4
23-5/8
91
AM-2720A/APN-89A
Coupler, Directional
1
2-1/2
2-3/8
5
1/4
CU-323/APN-81
Interconnection Box
1
5-7/8
11
16
24-1/2
J-607/APN-81 MD-1
Mounting MT-1405/APN-81
1
Interconnection Box
1
4-7/8
8-1/4
10-7/8
6-3/4
J-603/APN-81
Mounting MT-1404/APN-81
1
Interconnection Box
1
3-3/8
3-1/4
7-1/4
2
J-605A/APN-81
Control, Radar Set
1
6
5-3/4
5
3
C-3270/APN-89A
Amplifier, Electronic Control
1
13-3/8
13-1/2
21-7/8
58
AM-946A/APN-89
Mounting MT-1218/U
1
Amplifier, Electronic Control
1
7-3/4
6-1/8
10-5/8
10-1/2
AM-743/APN-81
Mounting MT-1191/APN-81
1
AN/APN-108: 2
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