E.f. Johnson Company

Transcrypt International/e. F. Johnson Company

James K Lyon

Donald R Bauman

Mark Daniel Dvorak

Steven J Pfiefer

Steve Pfiefer

Dana J Jensen

A bandwidth management system for a remote repeater network for modifying a first signal to create a second signal within the bandwidth of a communications link, transferring the second signal across the communications link, and reconstructing the first signal at the remote end of the communications link. The bandwidth management system featuring several mixing modes for performing the signal conversion and reconstruction. The system offering a calibration feature to correct for phase distortions introduced in reconstruction of the original signal. The calibration feature incorporating signals from a global positioning satellite system for reconstruction.

Bandwidth management system for a remote repeater network

A transmit control system using in-band tones for activating and deactivating one or more remote sites. The transmit control system detecting energy in two or more spectral regions to determine if the signal received is a harmonic signal or a signalling tone to prevent accidental deactivation of the transmitter system. In one application, a modified Goertzel algorithm is employed by a digital signal processor to provide tone detection and a two stage detection provides controlled switching in noisy environments.

Transmit control system using in-band tone signalling

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Waseca, MN, United States of America

James K Lyon