Regency Electronics, Inc.

Aor, Ltd.

Shigeru Takano

A full-spectrum, multi-mode radio receiver provides truly continuous coverage of reception of radio signals in a variety of modes or formats, and in a frequency range extending from about 10 kHz to about 2600 MHz. That is, there or no frequencies or frequency bands within which reception is not possible or is possible only with a reduced performance of the radio receiver, because of spurs, inter-modulation products, or images. The radio receiver provides this broad-spectrum, continuous coverage of reception, and does so with a receiver front-end tuning selectivity to as little as 1 Hz.

Full-spectrum all-mode radio receiver apparatus and method

A circuit arrangement for a wide band superheterodyne radio receiver for receiving wide band FM, narrow band FM, and AM modulated radio signals between 25 and 550 MHz. The first LO is a phase locked loop controlled VCO, with central processing unit control of the phase locked loop circuitry. The first IF frequency is higher than the highest received frequency and the output frequency of the first LO is higher than the first IF. A second LO and second mixer convert the signal to a second IF lower than the first IF. Separate third and fourth IF band pass filters are provided at the second IF for WFM and for NFM/AM, respectively. The output of the third IF filter (WFM) is converted by a third LO and third mixer to a third IF lower than the second IF. A WFM demodulator is provided at the third IF. The output of the fourth IF filter (NFM/AM) is converted by a fourth LO and fourth mixer to a fourth IF lower than the second IF frequency. A fifth IF band pass filter is provided at the fourth IF. The output of the fifth IF filter is received be separate NFM and AM demodulators. Each demodulator is followed by its own audio amplifier, each selectively connectable to a speaker.

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Tokyo, Japan

Shigeru Takano