Title

Test and Evaluation of Altimeter AN/APN-57

Date

1952

Index Abstract

Coming Soon

Photo Quality

Undetermined

Report Number

WADC TR 52-193

Creator

Georgi, J. Paul

Goldman, Albert

Corporate Author

Wright Air Development Center

Extent

129

NTRL Accession Number

AD013162

Identifier

AD0013162

AD Number

13162

Access Rights

Unknown

Distribution Classification

1

DTIC Record Exists

Yes

Distribution Change Authority Correspondence

AFAL LTR

Distribution Change Action Date

1/1/1900

Abstract

The altimeter is designed to indicate the absolute altitude (terrain clearance) between heights of 10,000 and 35,000 ft. A servo-operated 3-pointer dial (calibrated from 0 to 100,000 ft) registers the altitude, and a CRT indicator shows the instantaneous error up to + or - 500 ft. The transmitter- receiver is a modified RT-69/APS-10 with a 0.25-microsec output pulse, 4-kw peak power, and a carrier frequency in the 9345- to 9405-mc range. A 60-in.-diam parabolic antenna reflector provides a beamwidth of 1.6 deg at the half-power points. Flight tests of 16 units showed that the design meets the accuracy requirements, provided that a compensating error of -42 ft is inserted during calibration. An apparent increase is indicated altitude caused by banking the test aircraft as little as 3 deg showed the need for antenna stabilization. The present system of recording altitude indications photographically was considered unsatisfactory.

Report Availability

Not available via Contrails

Date Issued

1952-04

Index In

DTIC

Type

report