Method of and apparatus for transmitting clandestine radio signa

Details Method of and apparatus for transmitting clandestine radio signa Method of and apparatus for transmitting clandestine radio signa

1977-12-30

1979-10-09

Birmiel, Howard A.

325 40, 325 65, 325473, 325477, H04K 100, H04B 1500

Patent

active

041707575

ABSTRACT:
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.

REFERENCES:
patent: 3478268 (1969-11-01), Coviello
patent: 3667049 (1972-05-01), Ostroff et al.
patent: 3706933 (1972-12-01), Bidell et al.
patent: 3742496 (1973-06-01), Jezo
patent: 3795879 (1974-03-01), Whitehouse et al.
patent: 3876941 (1975-04-01), Kohlenberg et al.
patent: 4037159 (1977-07-01), Martin
patent: 4122393 (1978-10-01), Gordy et al.
"Hughes Fullerton Capability Profile and Applications of Acoustic Surface ve Devices," Hughes Aircraft Co., 1971.

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