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Title: UHF FM receiver having improved frequency stability and low RFI emission

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.

Inventors:
 [1]
  1. Albuquerque, NM
Publication Date:
Research Org.:
AT & T Corp
OSTI Identifier:
867282
Patent Number(s):
US 4905087
Application Number:
07/237,191
Assignee:
United States of American as represented by United States (Washington, DC)
DOE Contract Number:  
AC04-76DP00789
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
uhf; fm; receiver; improved; frequency; stability; rfi; emission; converts; modulated; carrier; signals; baseband; video; heterodyne; conversion; stages; bandpass; filter; fixed; filters; noise; amplifier; amplifies; filtered; signal; applies; amplification; limited; demodulator; circuit; directly; converted; clamped; clamping; driving; monitor; receivers; theoretical; maximum; interference; adjacent; eliminated; due; absence; local; oscillator; video signal; frequency conversion; clamping circuit; carrier signal; bandpass filter; pass filter; local oscillator; video signals; modulated carrier; amplifier amplifies; fixed frequency; filtered signal; noise amplifier; fm receiver; amplification stage; carrier signals; amplification stages; /348/455/

Citation Formats

Lupinetti, Francesco. UHF FM receiver having improved frequency stability and low RFI emission. United States: N. p., 1990. Web.
Lupinetti, Francesco. UHF FM receiver having improved frequency stability and low RFI emission. United States.
Lupinetti, Francesco. Tue . "UHF FM receiver having improved frequency stability and low RFI emission". United States. https://www.osti.gov/servlets/purl/867282.
@article{osti_867282,
title = {UHF FM receiver having improved frequency stability and low RFI emission},
author = {Lupinetti, Francesco},
abstractNote = {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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1990},
month = {2}
}

Patent:

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