Further evaluation of diver communication systems

This investigation was conducted as part of a program of research involving six experiments; they are designed 1) to develop methodologies for the evaluation of diver communication systems and 2) to carry out evaluations on available units. The data from a previous study, using a diver-to-surface technique, are reviewed briefly as is the methodology of the third project (being carried out at TEKTITE-2 but not yet completed) which includes range and salt water as variables. The major focus of this second experiment is on a diver-to-diver procedure and data resulting from the evaluation of seven diver communication systems, vis., a) Hard-line: Aquaphone; b) Acoustic: Bendix and Yack-Yack, and c) Amplitude Modulated: PQC-1a , PQC-2, Aquasonics 811 and Aquasonics 42; all systems were used with a Nautilus muzzle and a double-hose regulator.