Up-down frequency converter for cable T.V.

Details Up-down frequency converter for cable T.V. Up-down frequency converter for cable T.V.

1981-03-23

1982-09-28

Bookbinder, Marc E.

Telecommunications

Receiver or analog modulated signal frequency converter

Frequency modifying or conversion

455189, 455301, H04B 126

Patent

active

043522092

ABSTRACT:
A cable television up-down tuner includes a first frequency up conversion stage in which a first local oscillator, tunable over a wide frequency range, is coupled to a ring diode mixer having individual biasing networks in series with each diode. A combination high pass and low pass filter provides a bandwidth coupling of input signals to the mixer. An intermediate frequency amplifier couples the up converted signal to a second mixer. A fixed tuned second local oscillator down converts the intermediate frequency signal to a selected television channel frequency. The first local oscillator includes a printed circuit board transmission line resonator which is tuned by a varactor diode. The two local oscillators are positioned adjacent the corners of a quadrilateral housing and are isolated from each other by three wall-type shields.

REFERENCES:
patent: 3226645 (1965-12-01), Harwood et al.
patent: 3309613 (1967-03-01), Bell
patent: 3742131 (1973-06-01), Rogeness
patent: 4214212 (1980-07-01), Dipietromaria

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