MIL-HDBK-162A
Volume 1
15 December 1965
Section 2
DATE: 1 July 1964
ITEM NAME: RADAR SET
COGNIZANT SERVICE: USN
TYPE: AN/APN-120
FEDERAL STOCK NUMBER:
USA
USN
USAF
USMC
STATUS OR TYPE CLASSIFICATION
Mfg(s) Name or Code Number: Emerson Research Laboratories. Washington. D. C.
Illustration Not Available
TECHNICAL DESCRIPTION
FUNCTIONAL DESCRIPTION
Power Requirements: 115/200v, 400 cps, 3-ph
Radar Set AN/APN120 is an electronic altimeter that
4-wire, 26. 5 vdc
contains both a low and a high altitude altimeter. The
Presentation: Dial indications
low altitude altimeter, Radar Set AN/APN-100,
No. of Channels: 2 (one each band)
measures from O to 3, 000 ft. The high altitude
Frequency: High altitude, 4225 i 25 mc; low al-
altimeter, Radar Set AN/APN-42, measures from 1,
titude, 9150 + 50 mc
500 to 75,000 ft. Low altitude accuracy is i (2 ft + 2qc
h). High altitude accuracy is i (22 ft + 0.025c h). Low
Emission: High altitude, pulse; low altitude
altitude information is displayed on a dial in the pilot
FMCW
cockpit. High altitude information is transmitted to an air
data computer and a digital dial in the navigator's
cockpit. The equipment is free from microphonics and
INSTALLATION CONSIDERATIONS
other interference caused by the aircraft environment.
Modular construction is employed and all units are
Siting:
bonded to a cold plate for efficient cooling.
Mounting: Hard mounted. Units are bonded to a
cold plate for efficient cooling.
Related Equipment:
RELATION TO SIMILAR EQUIPMENT
Cabling Requirement:
None.
AN/APN-120: 1
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