Evaluation of the Tunnel/Cache Detector - Portable Differential Magnetometer (PDM)
ARMY CONCEPT TEAM IN VIETNAM APO SAN FRANCISCO 96384
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The Army Concept Team in Vietnam evaluated the TunnelCache Detector - Portable Differential Magnetometer PDM to determine its suitability as a tunnel and cache locator in the combat environment of Vietnam. The PDM consists of three subsystems - a sensor and staff assembly, an audio readout, and a rechargeable battery pack. The complete system also includes manuals, spare battery pack, battery charger, spare cables, earphones, and target recording materials. Total weight of the system including the 60-pound storage case was 106 pounds. The 1st Cavalry Division Airmobile, the 25th Infantry Division, and 3d Brigade, 9th Infantry Division operated seven PDM from 25 March to 25 May 1970. The PDM provided a limited capability to detect and trace tunnels and to detect caches. It was recommended that the PDM not be deployed to Vietnam and that future development efforts on tunnel and cache detection equipment be directed toward light weight and rugged equipment that can operate effectively in dense vegetation.
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