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Theory of Operation - TM-55-1930-209-14P-12_156
Oscillator-Driver - cont - TM-55-1930-209-14P-12_158

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 The regulator is adjusted to give 8 V DC output when 12 V DC is applied to the input.  This will maintain a constant 17.8 watts output from the oscillator with a DC voltage range of 10-14 V DC. 1.1.3 Oscillator-Driver With  the  application  of  power  to  the  oscillator-stage  of  the  power  supply  (which  occurs  when  the  timer- stage  codes  the  regulator  "on")  the  oscillator  and  fog  signal  driver  (coil  and  diaphragm  mounted  in magnetic field) oscillate as a system at a at a natural frequency of approximately 390 HZ. The chamber in which the diaphragm moves is designed to operate as one half of an acoustic transformer. The  connecting  plumbing  and  the  horn  can  be  considered  the  other  half.    The  chamber  allows  the diaphragm to move a small volume of air at high pressure, and the plumbing and horn transform this into a large  volume  at  low  pressure.    The  chamber  thus  allows  the  small  diaphragm  to  operate  at  maximum efficiency. As the sound enters the main throat of the horn, it divides into two equal parts which are radiated at the top and bottom of the horn.  Along a plane passing through the center of the horn, perpendicular to the vertical axis, the sound waves will add.  This plane represents the maximum sound level available from the horn. As  the  angle  of  radiation  increases  or  decreases  with  respect  to  this  plane,  the  sound  waves  tend  to subtract.    This  characteristic  of  the  horn  results  in  a  horizontal  "pancake"  of  sound  with  consequent suppression of vertical radiation. Form No.  6310 0238 v







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