The narrowest frequency band within the instantaneous bandwidth of a radio telescope that can be discriminated and analyzed by the detection system.
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http://www.daviddarling.info/encyclopedia/R/resband.html
Resolution bandwidth (abbreviated as RB or RBW) is used to determine the frequency precision of a particular measurement, indicating the smallest frequency that can possibly be resolved in a given test. It is one of the two fundamental methods of measurement in the field of spectral analysis (the other is dynamic range)
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http://www.used-line.com/glossaries/glossary.cfm?g_id=11
The Resolution Bandwidth is the effective frequency which is measurable on a meter or analyzer such as a noise figure meter or spectrum analyzer
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http://www.used-line.com/glossaries/glossary.cfm?g_id=13
(RBW) Resolution bandwidth refers to the smallest frequency that can be resolved within a measured spectrum. RBW is a fundamental form of measurement in the realm of spectral analysis, as it delivers the frequency accuracy, or precision, of a given measurement
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http://www.used-line.com/glossaries/glossary.cfm?g_id=28
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