Full duplex FSK system

Details Full duplex FSK system Full duplex FSK system

1988-12-13

1993-08-31

Kuntz, Curtis

Pulse or digital communications

Repeaters

Testing

375 45, 375 88, 375 91, 329300, 332100, H04L 2710

Patent

active

052415660

ABSTRACT:
A frequency agile homodyne full duplex FSK system having a receiver section using an image-cancellation mixer wherein sum and difference signals generated by a pair of double-balanced mixers are added together with proper phase to cancel out the image response normally associated with heterodyne receivers and directly down-convert the carrier frequency to the baseband frequency. The transmitter section of the FSK system consists of an FSK modulator whose peak deviation is controlled by an active derivative of a crystal clock. The FSK modulator functions in the manner of a phasing single sideband (SSB) mixer with upper or lower sideband signals generated by the proper phasing of quadrature components of the carrier frequency and the peak deviation signal derived from a crystal clock.

REFERENCES:
patent: 4499585 (1985-02-01), Mosley et al.
patent: 4618966 (1986-10-01), Stepp et al.
patent: 4625319 (1986-11-01), Krawitz
patent: 4672636 (1987-06-01), Marshall et al.
patent: 4745627 (1988-05-01), Gubser
patent: 4752742 (1988-06-01), Akaiwa

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