The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 05, 1982
Filed:
Jun. 02, 1980
Christopher K Richardson, Romsey, GB;
Plessey Handel und Investments AG, Zug, CH;
Abstract
A duplex transceiver comprises a receiver aerial and a transmitter aerial, a pair of balanced mixers each fed from the transmitter aerial and from the receiver aerial, a phase quadrature device interposed in a signal path between one of the aerials and a first one of the balanced mixers, a multiplier fed from the mixers, an oscillator/modulator arrangement feeding the transmitter aerial and phased locked to the frequency of a received carrier signal by means of a phase control signal fed from the multiplier, a first phase detector fed from that first one of the balanced mixers which is fed via the phase quadrature device, a delay device via which the said first phase detector is fed from a second one of the balanced mixers, thereby to provide a control signal which is fed back to control the balance of the first balanced mixer, and a second phase detector fed from the second balanced mixer with an undelayed signal and, via the delay device, with a delay signal from the first one of the balanced mixers, thereby to produce a second control signal which is fed back to control the balance of the second balanced mixer, from which an output signal from the transceiver is derived. Alternative AM and FM embodiments are disclosed.