Double superheterodyne tuner

Details Double superheterodyne tuner Double superheterodyne tuner

1984-09-19

1987-04-28

Ng, Jin F.

Telecommunications

Receiver or analog modulated signal frequency converter

Frequency modifying or conversion

455301, 455347, 455349, H04B 126, H04B 108

Patent

active

046619984

ABSTRACT:
A compact or miniaturized well-shielded double superheterodyne tuner is provided, wherein an input circuit portion, a first mixing portion, a first intermediate frequency bandpass filter, a second mixing portion and an output circuit portion are mounted in separated casings. The first mixing portion and the second mixing portion are provided on printed boards and each mounted on a bottom plate of the casing. The casings containing the first and second mixing portion are arranged in a manner such that grounded surfaces of the printed boards contained in the casings are arranged face to face. The casing containing the bandpass filter is contacted adjacently to a common face of the face to face casings. Each of the casings containing the input and output circuit portions is located adjacently to each of faces common to the face to face casings and the filter containing casing. Some structual improvements are also provided for simplifying the manufacture and adjustment of the tuner.

REFERENCES:
patent: 4275369 (1981-06-01), Sekiguchi
patent: 4280113 (1981-07-01), Sekiguchi
patent: 4352209 (1982-09-01), Ma
patent: 4353132 (1982-10-01), Saitoh et al.
patent: 4490699 (1984-12-01), Yanagida
patent: 4494095 (1985-01-01), Noji et al.

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