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quick&dirty leakage level estimate?

Question asked by achronon on Mar 29, 2009
Latest reply on Apr 9, 2009 by jborges3
Does anyone have a clever or simple way to quantitatively estimate the TRFL leakage path for a given system?

I'm currently just considering a signal generator, a variable attenuator DUT, and a PSA receiver. I don't have access to a microwave antenna, so all I can do is connect the circuit and measure the noise floor, and then terminate the PSA input and  measure the resultant signal. Comparing the two sets of data I can estimate the leakage signal (for my first few trials it appeared to be negative, ie., lower than the connected circuit noise floor), but does this give me the leakage path attenuation? 

(The purpose is to estimate the uncertainty contribution to precision relative TRFL measurements due to leakage.  So ultimately it would be sufficient if I can simply show the leakage is very low and can be ignored as a source of uncertainty.)