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FA232/FA390A 1/2 MILE SOUND SIGNAL SYSTEM
Theory of Operation - TM-55-1930-209-14P-12_156

TM-55-1930-209-14P-12 Water Purification Barges (NSN 1930-01-234-2165) Lighting System Manual
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TM 55-1930-209-14&P-12 1.0 Description The Automatic Power, Inc.  FA232/FA390A produces an omnidirectional sound signal to meet the provisions of 33 CFR 67 for a one half mile sound signal. The frequency of 390 3 HZ is determined by a highly reliable feedback oscillator mounted inside the dome cover of the signal, and coupled to the emitter driver. A solid state program timer forms an integral part of the oscillator module.  The timer PCB module mounts above and connects directly to the oscillator.  See drawing below. FIRST TIMER OSCILLATOR Form No.  6310 0238







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