Telecommunications – Receiver or analog modulated signal frequency converter – Local control of receiver operation
Patent
1987-12-31
1989-10-24
Griffin, Robert L.
Telecommunications
Receiver or analog modulated signal frequency converter
Local control of receiver operation
455307, 455316, 455340, 333175, H04B 110
Patent
active
048767395
ABSTRACT:
A TVRO receiver for receiving frequency-modulated video signals, the receiver comprising a tuner including a superheterodyne circuit having a voltage-controlled oscillator (VCO), means for supplying a controlling input voltage to the VCO, and a mixer for combining incoming 1st IF signals with the output of the VCO to reduce the frequency of the 1st IF signals to a 2nd IF frequency which is sufficiently high to permit the output frequency of the VCO to be above the frequency range of the 1st IF signals, and a linear phase passband filter for passing a single video channel in the 2nd IF output from the mixer, the filter producing an output which is at least about 10 dB down from its peak at both +10 MHz and -10 MHz from the center of the passband of the filter.
REFERENCES:
patent: 4545072 (1985-10-01), Skutta et al.
patent: 4551856 (1985-11-01), Victor et al.
patent: 4718117 (1988-01-01), Ma et al.
patent: 4761825 (1988-08-01), Ma
Houston Albert C.
Ma John Y.
Capetronic (BSR) Ltd.
Griffin Robert L.
Irfan Kareem M.
Kuntz Curtis
Rudisill Stephen G.
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