[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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