Accession Number : ADA118281

Title :   Water Entry into the MX-6707/VRC Antenna Matching Unit-Base.

Descriptive Note : Technical rept.,

Corporate Author : ARMY MATERIEL SYSTEMS ANALYSIS ACTIVITY ABERDEEN PROVING GROUND MD

Personal Author(s) : Harris,Harry N

PDF Url : ADA118281

Report Date : Jun 1982

Pagination or Media Count : 66

Abstract : The MX-6707/VRC Antenna Matching Unit-Base fails at a high rate because water enters through cracks in the Lexan material. The cracks are caused by personnel applying excessive torque to the mounting hexbolts. It is suspected that water enters the matching unit when the vehicle with the matching unit mounted in it is washed using a high pressure hose. Subsequent rust and corrosion of the internal electronics is so serve that sixty percent of the matching units are rejected at the repair depot. Some damage is also caused during field exercises by the extended antenna hitting trees and brush and transmitting stress to the MX-6707. Four modifications were introduced between 1975 and 1977 to resolve the water entry problem, but they were not made on fielded matching units. Modified units are working satisfactorily as indicated from AMSAA Field Liaison trip reports, a field survey conducted by SGO CECOM Representatives, and limited tests conducted at the Aberdeen Proving Ground by the Materiel Testing Directorate (MTD). The MTD tests did not address aging or environmental factors.

Descriptors :   *Ground vehicle antennas, Supply depots, Surveys, High pressure, Materiel, Repair, Matching, Rust(Oxidation), High rate, Water entry, Antennas, Addressing, Internal, Field conditions, Electronics, Environments, Trees, Test methods, Transmitting, Modification, Hoses, Cracks, Water, Aging(Materials), Stresses, Corrosion

Subject Categories : Electrical and Electronic Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE