Accession Number : ADD005836
Title : Digital C/kT Meter.
Descriptive Note : Patent,
Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON D C
Personal Author(s) : Mott,Murray H
Report Date : 14 Nov 1978
Pagination or Media Count : 6
Abstract : A digital C/kT meter is described for measuring the ratio of carrier power to noise power in a one Hz bandwidth and provide the results to a continuous read-out digital display. The circuit receives an input signal from the i-f amplifier prior to demodulation. The signal is amplified and fed to a mixer where it is converted down to a lower frequency. The mixer supplies the signal to a power divider through a voltage controlled attenuator where the signal is split into a noise power channel and a carrier power channel. The noise signal is filtered, amplified and fed to a detector/amplifier. The output of the detector/amplifier is integrated and fed back to the voltage controlled attenuator to form an automatic gain control feedback loop such that the noise power level output of the bandpass filter and amplifier is held constant. The result is that the log of the voltage drop across the resistor is directly proportional to the ratio of carrier power to noise power and is employed to actuate a digital display.
Descriptors : *Patents, *Noise analyzers, *Electrical measurement, Noise(Electrical and electromagnetic), Feedback, Automatic gain control, Power levels, Bandpass filters, Digital systems, Display systems
Subject Categories : Test Facilities, Equipment and Methods
Distribution Statement : APPROVED FOR PUBLIC RELEASE