Double superheterodyne tuner for receiving television aural sign

Details Double superheterodyne tuner for receiving television aural sign Double superheterodyne tuner for receiving television aural sign

1980-03-13

1982-03-30

Bookbinder, Marc E.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

455190, 455315, H04B 126

Patent

active

043228569

ABSTRACT:
A double superheterodyne tuner for receiving television aural signals comprises first local oscillators by which an output of a first mixer receiving a VHF signal or a UHF signal is made a frequency between the VHF signal and the UHF signal, and a second local oscillator by which an output of a second mixer receiving a first intermediate frequency signal is made a frequency of 10.7 MHz. Oscillator frequencies are selected to avoid beat frequency interference for harmonics thereof up to and including the fifth order.

REFERENCES:
patent: 2510906 (1950-06-01), Reid
patent: 2529443 (1950-11-01), Bach
patent: 2589387 (1952-03-01), Hugenholtz
patent: 2616037 (1952-10-01), Wheeler et al.
patent: 2849602 (1958-08-01), Hesse
patent: 3343092 (1967-09-01), Davids et al.
patent: 3479601 (1969-11-01), Mattern
patent: 3696302 (1972-10-01), Gossard

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