Cryptography – Communication system using cryptography – Wireless communication
Patent
1967-01-04
1990-10-09
Tarcza, Thomas H.
Cryptography
Communication system using cryptography
Wireless communication
375 1, 455314, H04K 110, H03D 716
Patent
active
049625349
ABSTRACT:
A frequency diversity receiver system operating over a predetermined bandwidth comprising a first mixer receiving two identical information signals widely separated in frequency, a stepping oscillator with a predetermined number of steps controlling the output frequency of said mixer, two frequency channels at the output of said mixer, the first of said channels having a broad bandwidth filter and the second having a narrow bandwidth filter, a second mixer receiving simultaneously the output of said second filter and the output signal of a sweeping oscillator, said sweeping oscillator having a preselected sweep, means to synchronize said sweeping oscillator and said stepping oscillator, a multiplier simultaneously receiving the output signals from said first filter and said second mixer, a bank of parallel filters and associated detectors receiving the output signals from said multiplier, each of said filters of said bank having a predetermined bandwidth.
REFERENCES:
patent: 3158864 (1964-11-01), Lehan
Drosd, deceased Ralph D.
Gregory, administrator by Luther W.
Taylor Richard L.
Barron Jr. Gilberto
Erlich Jacob N.
Singer Donald J.
Tarcza Thomas H.
The United States of America as represented by the Secretary of
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