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:
Sep. 14, 1982
Filed:
Jun. 30, 1980
Christopher K Richardson, Romsey, GB;
Plessey Handel und Investments AG, Zug, CH;
Abstract
A transceiver comprising an oscillator/modulator adapted for angle modulation and providing an output signal for transmission wherein the phase deviation does not substantially exceed 90.degree., an aerial for transmitting the output signal and for accepting received signals, a first mixer for mixing the transmission signal from the oscillator/modulator with the received signal, a second mixer for mixing the transmission signal from the oscillator/modulator with the received signal, a phase quadrature device arranged so that one of the signals fed to the first mixer is in phase quadrature with the corresponding signal fed to the second mixer and a demodulator fed with signals from the mixers, the demodulator comprising two band pass filters fed one from each mixer, a phase shifter effective for imposing a differential phase shift of substantially 90.degree. between the output signals from the two filters and a combiner to which output signals from the phase shifter are fed and which provides a demodulated output signal.