First IF filter with fixed second half-IF trap for use in an FM

Details First IF filter with fixed second half-IF trap for use in an FM First IF filter with fixed second half-IF trap for use in an FM

1990-08-06

1992-08-25

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358189, 358196, 358198, 4551891, 4551801, 4551911, H04N 550

Patent

active

051423693

ABSTRACT:
A television receiver includes a single tuner for tuning both television channels and broadcast FM stations. The tuner is operated at a fixed gain setting in FM reception mode. The tuner serves as the first conversion stage of a double conversion FM receiver, wherein the mixer of an FM radio integrated circuit serves as the second conversion stage. The arrangement operates at a specific and non-arbitrary first IF frequency. The FM receiver is also capable of automatically receiving National Weather Service broadcasts on that one of NWS's seven allocated frequencies which is operating in a listener's area. The receiver provides an on-screen display of the currently tuned FM channel number.

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SAMS Photofact Schematic for the Dumont Model RA-119A television receiver, circa 1952.
An article in Funk-Technik, vol. 35, No. 6/1980, pp. 216-226, (translation attached).

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