Antenna input circuit for AM/FM radio receiver

Details Antenna input circuit for AM/FM radio receiver Antenna input circuit for AM/FM radio receiver

1977-10-27

1980-06-17

Lieberman, Eli

Communications: radio wave antennas

Antennas

With coupling network or impedance in the leadin

455277, H01Q 2130

Patent

active

042086639

ABSTRACT:
An antenna input circuit for an AM/FM radio receiver comprises an input transformer for FM broadcast reception, an input transformer for AM broadcast reception, at least one antenna terminal for the connection of the transmission line leading from an FM-receiving antenna, and a filter network connecting the antenna terminal to each primary winding of those input transformers. The filter network is such that from the antenna terminal, it feeds, with little loss, FM broadcast signals to the FM input transformer, while it feeds, with an allowable amount of loss, AM broadcast signals to the AM input transformer. Thus, the antenna input circuit allows an AM/FM receiver to receive either an FM broadcast or an AM broadcast by using only a single antenna and without changing the connection of the antenna transmission line.

REFERENCES:
patent: 3465344 (1969-09-01), Scott
patent: 3725942 (1973-04-01), Ukmar
patent: 3824599 (1974-07-01), Haswell
patent: 4037177 (1977-07-01), Tyrey
patent: 4085405 (1978-04-01), Barlow

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