Method of and Apparatus for Transmitting Clandestine Radio Signals.
DEPARTMENT OF THE ARMY WASHINGTON DC
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Clandestine signals are transmitted by using a surface wave acoustic device to disperse the spectrum of a pulse-modulated CW carrier. The dispersed signal is itself modulated and then transmitted to a remote location, at low level. At the remote location, an acoustic device of conjugate characteristics is used to recover the dispersed signal from out of the background noise. Author
- Radio Communications