[Milsurplus] NAF 68304 Nay Beam Filter

B. Smith smithab11 at comcast.net
Fri Jun 1 08:10:57 EDT 2007


"The reason for the odd audio frequency---1020 Hz---dates back to when 
ground
stations generated tones with reference to an electric motor. A common motor
speed is 1800 RPM, which is also 30 revolutions per second, or 30 Hz.
Multiply that by 34 and the result is 1020." The 1020 tone is still in use 
today.

This was one of the test questions at the MRCA meet two years ago using the 
famous Red, Blue, white, and yellow cards.

breck k4che
"Crystal-controlled, weak, and on AM is no way to go through life"


 



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