Thanks Steve,
As I read EMRFD, the external 50 Ohm resistor is intended to be input Z
of a Voltmeter or Spectrum Analyzer.
The solutions I just posted is using a high Z oscilloscope as a voltmeter.
It takes one line of code to factor in external 50 ohm, Rs = 1/(1/Rs - 1/50)
When using a volt meter, my preference to compute Rs directly without dB
computation.
John KN5L
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On 8/28/22 7:23 PM, Steve Ratzlaff wrote:
The ARRL publication Experimental Methods in RF Design (aka EMRFD),
first published around 2003, has the same? info on using notch depth to
compute Q for a series or parallel circuit, p. 7.36, Chapter 7.9, "Q
Measurement of LC Resonators". Both series and parallel trap methods are
shown along with the formulas.
