Controlled local oscillator with apparatus for extending its fre

Details Controlled local oscillator with apparatus for extending its fre Controlled local oscillator with apparatus for extending its fre

1980-02-08

1981-09-08

Bookbinder, Marc E.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

331177V, 455318, H04B 126, H03B 512

Patent

active

042888751

ABSTRACT:
A tuner for a television receiver includes a voltage controlled local oscillator for tuning VHF channels comprising a transistor arranged in a common base amplifier configuration and a parallel tuned circuit including a varactor diode responsive to a tuning voltage and a first inductor configuration for the low VHF band and a second inductor configuration for the high VHF band connected between the collector and emitter electrodes of the transistor. A second varactor diode also responsive to the tuning voltage is connected between the emitter and base electrodes of the transistor to expand the range of the local oscillator in its high VHF configuration to permit tuning of channels in a midband cable band between the low and high VHF bands without the need for a third inductor configuration.

REFERENCES:
patent: 2950385 (1960-08-01), Yasuda et al.
patent: 3029339 (1962-04-01), Pan
patent: 3103637 (1963-09-01), Pan
patent: 3370254 (1968-02-01), Keller
patent: 3617899 (1971-11-01), Goncharoff et al.
patent: 4146850 (1979-03-01), Fache et al.
RCA Service Data, File 1979 C-6, P34-Frequency Synthesis Tuner Schematic.

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