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Conjugate matching and my funky VSWR meter

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May 24th 04, 06:21 AM

Richard Clark

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On 23 May 2004 23:50:02 GMT, (Tdonaly) wrote:

S-parameters are supposed to work best on small-signal analysis, where
everything is fairly linear.

Hi All,

Tom's implication (S-parameters don't fit to power amps) is supported
by a simple comparison of another UHF transistor, 2N3948:
by S-param as measured
input R 9 Ohms 38 Ohms
input X 12nH 21pF
output R 199 Ohms 92 Ohms
output X 4.6pF 5pF

S-params may be useful for comparing devices, but are inadequate for
power application design - unless, of course, you can tolerate 400%
error and inverted reactances.

73's
Richard Clark, KB7QHC

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