A Microwave System for Measurements of AM and FM Noise Spectra

This paper describes a noise measuring system with a high degree of flexibility in regard to video frequency coverage as well as radio frequency coverage. Noise systems for S, X, and Ku-bands were constructed to obtain high sensitivity at spectral frequencies from several Hz to 30 MHz off the carrie...

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Bibliographic Details
Published in:IEEE transactions on microwave theory and techniques 1968-09, Vol.16 (9), p.767-781
Main Author: Ondria, J.G.
Format: Article
Language:English
Subjects:
Bandwidth
Doppler radar
Fluctuations
Frequency measurement
Low-frequency noise
Microwave measurements
Noise measurement
Power measurement
Radio frequency
Strips
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Summary:This paper describes a noise measuring system with a high degree of flexibility in regard to video frequency coverage as well as radio frequency coverage. Noise systems for S, X, and Ku-bands were constructed to obtain high sensitivity at spectral frequencies from several Hz to 30 MHz off the carrier. The measured limiting sensitivities of the X-band set over the video range 20 Hz to 325 kHz with an input power of 10 mW are --145 dB for AM noise and 0.02 Hz rms for FM noise in a 100-Hz measuring bandwidth.
ISSN:0018-9480
1557-9670
DOI:10.1109/TMTT.1968.1126784