Volume 1
MIL-HDBK-162A
Section 2
15 December 1965
ITEM NAME: ELECTRONIC ALTIMETER SET
TYPE: AN/APN-42A
Altitude Accuracy: plus 20 ft plus or
RELATION TO SIMILAR EQUIPMENT
minus 0.025% of altitude
Altitude Rate: Up to 1000 ft per sec
None.
Transmitter Power Output: 2000w peak min
TECHNICAL DESCRIPTION
Loop Sensitivity: No less than 115 db
Receiver Sensitivity: No less than 82 dbm
Antenna Gain: 17 db min
Transmitted Frequency: 4225 plus or
Input Power Requirements
minus 5 mc
dc: 25.0 to 29v, 22.5w
Pulse Width: Less than 0.1 usec
ac: 101 to 121v, 380 to 120 cps,
Pulse Repetition Rate: 4916.45 pps
single ph, 193 va (174w with 0.905 lagging power
plus or minus 0.025%
factor).
Intermediate Frequency: 60 plus or
minus 2 mc
Altitude Range: 200( to 70,000 ft
PRINCIPAL COMPONENTS AND PHYSICAL DATA
COMPONENT
QTY
HEIGHT
WIDTH
DEPTH
UNIT WT.
(Inches)
(Inches)
(Inches)
Amplifier, Electronic Control
1
7-5/8
5-7/8
13-5/8
14.43
AM-887/APN-42A
Receiver-Transmitter
1
3-7/8
13-3/4
11-3/8
12.49
RT-66L/APN-12A
Antenna AS-665/APN-42A
1
1-1/2
15
12-1/4
3.61
Indicator ID-375/APN-42A
1
3-1/4
3-1/4
5-29/64
2.27
Mounting MT-1256/APN-42A
I
6 1/16
6-3/4
16-1/2
2.35
Mounting MT-1641/APN-42A
1
6
17-13/32
14-19/32
1.41
REFERENCE DATA AND LITERATURE
Technical Orders:
12P5-2APN42-12
12P5-2APN42-14
AN/APN-42A: 2
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