MIL-HDBK-162A
Volume 1
15 December 1965
Section 3
DATE: 1 July 1964
ITEM NAME: DIRECTIONAL ANTENNA ASSEMBLY
COGNIZANT SERVICE: USN
TYPE: AN/UPA-4
FEDERAL STOCK NUMBER:
USA
USN
USAF
USMC
STATUS OR TYPE CLASSIFICATION
Used By
Used By
Mfg(s) Name or Code Number: Palmer-Bee Company (45510)
occasion demands, may be manually operated or driven
FUNCTIONAL DESCRIPTION
remotely in synchronism, with a radar antenna. Like all
radar systems it makes use of pulse transmission, but
The Directional Antenna Assembly AN/UPA-1 serves
unlike other radar, its beam is not reflected back from
a distinct purpose, differing from conventional radar
the target but enters a receiver on a friendly ship or
systems since it is exclusively a means for identifying as
plane where an identifying signal is automatically
friend or foe all ships or planes within its range. It may
transmitted back to the inquiring source.
be operated with equal facility on ship or land, and as
AN/UPA-4: 1
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