UHF FM receiver having improved frequency stability and low RFI

Details UHF FM receiver having improved frequency stability and low RFI UHF FM receiver having improved frequency stability and low RFI

1988-08-29

1990-02-27

Chin, Tommy P.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

455190, 455205, 455208, 455313, 455323, H04N 5455, H04B 130

Patent

active

049050877

ABSTRACT:
A UHF receiver which converts UHF modulated carrier signals to baseband video signals without any heterodyne or frequency conversion stages. A bandpass filter having a fixed frequency first filters the signals. A low noise amplifier amplifies the filtered signal and applies the signal through further amplification stages to a limited FM demodulator circuit. The UHF signal is directly converted to a baseband video signal. The baseband video signal is clamped by a clamping circuit before driving a monitor. Frequency stability for the receivers is at a theoretical maximum, and interference to adjacent receivers is eliminated due to the absence of a local oscillator.

REFERENCES:
patent: 3872387 (1975-03-01), Banach
patent: 4408351 (1983-10-01), Maurer
patent: 4607392 (1986-08-01), Nolde
patent: 4672636 (1987-06-01), Marshall
patent: 4716464 (1987-12-01), Parker
patent: 4817198 (1989-03-01), Rinderle
patent: 4837853 (1989-06-01), Heck

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