Richard Clark wrote:
Load pulling is vastly simpler than S-parameters (also specified in
the data sheets for this device, down to 1MHz), why you want to marry
the two is a mystery.

A laboratory bench setup is simpler than a calculator and a couple
of sheets of paper? Egads Richard, s-parameter analysis was invented
in order to make things "vastly simpler" - and it does!
--
73, Cecil http://www.qsl.net/w5dxp



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Cecil wrote,

Richard Clark wrote:
Load pulling is vastly simpler than S-parameters (also specified in
the data sheets for this device, down to 1MHz), why you want to marry
the two is a mystery.

A laboratory bench setup is simpler than a calculator and a couple
of sheets of paper? Egads Richard, s-parameter analysis was invented
in order to make things "vastly simpler" - and it does!
--
73, Cecil http://www.qsl.net/w5dxp



S-parameters are supposed to work best on small-signal analysis, where
everything is fairly linear. In this case, the MRF 136 is a power fet and
Motorola
says you can use s-parameters as a first approximation. In the data sheet, they
provide a list
of common source scattering parameters from 2.0 Mhz up to 800 Mhz. I suppose
that's useful to someone familiar with s-parameter techniques.
73,
KA6RUH

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

Therefore, should work well on transmission-line analysis, where
everything is linear.
--
73, Cecil http://www.qsl.net/w5dxp



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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

Richard Clark wrote:
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.

The actual subject of the s-parameter analysis was a linear Z0-match
network point, not an amplifier, so your statements are irrelevant.
--
73, Cecil http://www.qsl.net/w5dxp



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