Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1975-05-09
1976-09-28
Griffin, Robert L.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
325 21, 325 25, 343176, H04B 140
Patent
active
039834840
ABSTRACT:
A multichannel signal transmitting and receiving apparatus comprises a single reference local oscillator, a phase locked loop including a phase comparator receiving as one input a signal resulting from a frequency division of the output of the local oscillator and a voltage controlled oscillator, a frequency divider for supplying the output of the voltage controlled oscillator as another input to the phase comparator, a circuit for heterodyning a signal received through an antenna with the oscillation outputs of the voltage controlled oscillator and the local oscillator and thereafter detecting the signal thus heterodyned thereby to obtain an audio signal, a frequency converter for obtaining a carrier wave for signal transmission from the oscillation outputs of the local oscillator and the voltage controlled oscillator, a circuit for modulating the carrier wave thus obtained with the audio signal and transmitting the modulated signal through the antenna, a circuit for controllably changing over the oscillation frequency of the local oscillator between different values respectively for signal reception and signal transmission, and a circuit for so controllably changing over the frequency division ratio of the frequency divider between different values respectively for signal transmission and signal reception for each of a plurality of channels. The single local oscillator is used for both signal reception and signal transmission. The frequency converter is provided outside of the loop of the phase locked loop.
REFERENCES:
patent: 3201692 (1965-08-01), Sichak et al.
patent: 3413554 (1968-11-01), Yates et al.
patent: 3487311 (1969-12-01), Luhowy
patent: 3641434 (1972-02-01), Yates et al.
patent: 3696422 (1972-10-01), Burrell
patent: 3825830 (1974-07-01), O'Connor
patent: 3916412 (1975-10-01), Amoroso, Jr.
patent: 3944925 (1976-03-01), De Laune
patent: 3949296 (1976-04-01), McClaskey et al.
Bookbinder Marc E.
Griffin Robert L.
Nihon Dengyo Co., Ltd.
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