On 1/1/2018 6:10 PM, Avery Davis wrote:
I apologize for not being more clear, but the point of the
exercise is not to measure the complete complex impedance to within 10%,
although you are right that a simple S11 reflection measurement has a
limited impedance range depending on the instrument, but to assess the
suitability for use in a certain frequency range, and the S11
measurement on a Smith chart will clearly demonstrate resonance effects
and the effective frequency range.
Avery,
Somehow I failed to clearly make the point that measurement errors
associated with measuring high Z chokes with S11 is NOT a relatively
small error, like 10%. It can be a VERY LARGE error, like 50-70% in
resonant frequency. Which FAILS to allow assessment of suitability for
use in a given frequency range.
73, Jim
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