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Old 17th Aug 2016, 21:24
  #81 (permalink)  
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On early intercoms the band was 500 to 3500 cycles (no hzs in those days). To stop the leakage of noise from the A/C power to the I/c 400 c/s was used. Greater than 3500 and the loses became too high.
All before my time but I remember am old crusty one telling me.
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Old 19th Aug 2016, 06:13
  #82 (permalink)  
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Two 737 BBJ's that I've worked on had 240V 50Hz single phase outlets throughout the cabin. They had two inverters mounted in the stab compartment.

From memory it becomes a problem if try and run a 400Hz device off 50/60Hz rather than the other way around.
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