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U.S. Department of Energy
Office of Scientific and Technical Information

UHF FM receiver having improved frequency stability and low RFI emission

Patent ·
OSTI ID:867282

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.

Research Organization:
AT & T Corp
DOE Contract Number:
AC04-76DP00789
Assignee:
United States of American as represented by United States (Washington, DC)
Patent Number(s):
US 4905087
Application Number:
07/237,191
OSTI ID:
867282
Country of Publication:
United States
Language:
English