[Milsurplus] Harvey Wells AR-5A Military Aircraft

Sheldon Daitch sdaitch at ibb.gov
Fri Oct 22 13:15:39 EDT 2004


When the old four range navigation systems were in 
place, wasn't the "A" "N" Morse code information
modulated with 1040 hz tone, and the filter switch
allowed the pilots to either listen to the range 
tone, the modulated CW, or notch out the tone and 
listen to voice on the frequency, or perhaps it was
the opposite, the filter was a bandpass filter
allowing only the modulated CW to be heard.

http://www.naco.faa.gov/index.asp?xml=fioo/fihistory

73
Sheldon
WA4MZZ


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