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Why is pulse desensitization 20log for power?

Question asked by gcb on May 4, 2008
Latest reply on May 14, 2008 by gcb
I've been pouring over App Note 150-2, among others, and I'm trying to understand where the pulse desensitization factors come from.

Specifically, I'm looking at the factor for line spectra which is given as:

I understand that when the PRF doubles, the spectrum contains half as many spectral lines, each line containing twice as much power.  That only seems to  account for half the desensitization, however.

This term seems to be following a voltage law, rather than a power law, but the plots are labeled in dBm-- which implies that it is, in fact, power.