Telecommunications – Transmitter – Angle modulation
Patent
1985-09-11
1987-12-01
Ng, Jin F.
Telecommunications
Transmitter
Angle modulation
455119, 331 23, 332 19, H04B 104
Patent
active
047109700
ABSTRACT:
A UHF transmission frequency oscillator generates a UHF radio signal that is frequency modulated by a program signal. The voltage applied to a control voltage input of the UHF transmission frequency oscillator controls the transmission frequency. A sample of the UHF transmission frequency signal is heterodyned with the output of a crystal controlled reference frequency oscillator to generate a frequency difference signal. A voltage controlled VHF radio signal generator produces a VHF signal frequency modulated by the program signal. A phase detector receives the frequency difference signal and the VHF signal frequency modulated by the program signal and therefrom applies a voltage to the control voltage input of the UHF transmission frequency oscillator for the transmission of a UHF radio frequency signal frequency modulated by the program signal. The VHF voltage controlled generator has VHF programmable frequency dividers, which are pre-settable, to establish the VHF radio transmission frequency. The output of the VHF voltage controlled generator is phase locked through the phase detector with the crystal controlled reference oscillator for the stabilizing of the output transmission frequency of the UHF transmission frequency oscillator.
REFERENCES:
patent: 3644831 (1972-02-01), Latker et al.
patent: 4060773 (1977-11-01), Hata et al.
patent: 4123725 (1978-10-01), Davis
patent: 4186356 (1980-01-01), Remy
patent: 4449250 (1984-05-01), Kurby
patent: 4610030 (1986-09-01), Dominguez et al.
Advertising literature published by Moseley Associates, Inc. on Aural Studio-Transmitter Links, 7/84.
Advertising literature published by Moseley Associates, Inc. on Aural Studio-Transmitter Links, 5/77.
Advertising literature published by Micro Controls, Inc. on Studio/Transmitter Link at least as early as May 4, 1984.
James John
Law Yee-Shing
Wu Joseph C.
Ng Jin F.
TFT, Inc.
Wiseman Jack M.
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