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MIL-A-20222 1951 Edition, October 30, 1951
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ANNOUNCING-EQUIPMENT, SHIPBOARD
Includes all amendments and changes through Cancellation Notice 1, June 7, 1989
Additional Comments: CNCL S/S BY MIL-A-21577;MIL-M-23813;MIL-A-24233
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The principle purpose of announcing systems installed aboard Naval vessels is the transmission and reproduction of intelligible speech and discernible alarm signals over high noise levels. To meet this end, the basic requirements of the announcing equipment covered by this specification are reliability, sturdiness, simplicity of design, ease of servicing and maintenance, light weight, compctness, and the ability to withstand severe shock, vibration, gunfire and the adverse effects of salt spray, high humidity and extremes of temperature. The basic requirements of the system are (a) flexibility of operation to permit maximum utilization of the facilities provided and (b) facilities for readily isolating a fàulty component or circuit so Qat remaining components and circults can continuq in operation. An additional objective of this specification is to insure designs of major components, such as microphones, microphone components, amplifiers and loudspeakers, which will permit electrical interchangeability and satisfactory operation of the'se components in any announcing system, regardless of its manufactur