Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1977-11-09
1978-11-14
Richardson, Robert L.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
325 67, 324 57R, H04B 1700
Patent
active
041258096
ABSTRACT:
A digital C/kT meter for measuring the ratio of carrier power to noise po 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 carrier power is measured in the carrier channel similar to that of the noise channel except that the voltage controlled attenuator is in the carrier channel only. A resistor is connected in series in the feedback circuit to the carrier attenuator. 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.
REFERENCES:
patent: 3351853 (1967-11-01), Wood
patent: 3463934 (1969-08-01), Nobis
patent: 3971989 (1976-07-01), Singer et al.
patent: 4034285 (1977-07-01), Ashley et al.
Chin Tommy P.
Phillips T. M.
Richardson Robert L.
Rubens G. J.
Sciascia R. S.
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