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Automatic Range Changer For SWR MeterCommercial unit modified for antenna-pattern measurements. Addition of automatic range-changing circuit converts Hewlett-Packard 415E standing-wave-ratio (SWR) meter into radio-frequency detector suitable for computer-controlled measurements of radiation patterns of antennas. Modification gives SWR meter effective dynamic range of at least 40 dB. Includes two digital lines communicating one of four range settings to controlling computer and one digital line to inhibit transfer of data when range being changed. Ideal instrument for use in applications involving computer-controlled monitoring of power when large changes in signal level expected.
Document ID
19900000378
Acquisition Source
Legacy CDMS
Document Type
Other - NASA Tech Brief
Authors
Dengler, Robert J. (Caltech)
Siegel, Peter H. (Caltech)
Date Acquired
August 14, 2013
Publication Date
August 1, 1990
Publication Information
Publication: NASA Tech Briefs
Volume: 14
Issue: 8
ISSN: 0145-319X
Subject Category
Electronic Components And Circuits
Report/Patent Number
NPO-17822
Accession Number
90B10378
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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