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Quick and dirty impedance measurement

Not sure where I learned this from, but here is a quick and dirty method to find the approximate impedance of an active RF circuit.


Measure the no load voltage with an oscilloscope or RF probe

Find the non inductive load that will drops the no load voltage in half. I often use a carbon composition potentiometer.

The value of your load resistor is your approximate source impedance.

73 de KB9JJA
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