Accession Number : AD0920462

Title :   Development Test II (Service Test Phase, Arctic Environment) of Mast AB-621 ( )/G.

Descriptive Note : Final letter rept. 30 Oct 73-1 Apr 74,

Corporate Author : ARMY ARCTIC TEST CENTER FORT GREELY AK

Personal Author(s) : Barnes, John W., Jr

Report Date : 15 MAY 1974

Pagination or Media Count : 21

Abstract : Mast AB-621 was developed as part of the AN/GRC-67 Radio Terminal and AN/GRC-68 Radio Repeater. It was type classified Std-A in Augugst 1964, and is used with the AN/GRC-144 Radio Set in the Army Tactical COMMUNICATIONS High Capacity Subsystem. The AB-621 is a quickly erectable, uniformly sectionalized, guyed mast which can be erected to heights of up to 50 feet. It supports a 4.5 foot hornfed parabolic reflector antenna. Previous arctic testing of similar masts (AB-577 and AB-952) revealed a safety deficiency in that the accumulation of frost, ice and snow on the exposed portions of the masts prohibited safe disassembly. To preclude the occurrence of similar problems during arctic service testing of the Mast AB-621, a winterization kit for the mast was developed. The winterization kit consists of protective mast section covers, guy snubber covers, rubber shrouds to protect the launcher assembly, an expendable plywood base and the necessary auxiliary tools needed to install the kit on the mast.

Descriptors :   (*ANTENNA MASTS, TEST METHODS), (*RADIO EQUIPMENT, PARABOLIC ANTENNAS), TACTICAL COMMUNICATIONS, MECHANICAL CABLES, COLD WEATHER TESTS, WINTERIZATION KITS, ICE, SNOW, WIND, RELIABILITY, SAFETY, TEMPERATURE, HUMAN FACTORS ENGINEERING, ARCTIC REGIONS.

Subject Categories : Electrical and Electronic Equipment
      Structural Engineering and Building Technology
      Radio Communications

Distribution Statement : APPROVED FOR PUBLIC RELEASE