Jim,
I assume from your previous comments that you went the FFT way.
As I was flying I had some time to kill, so I read some papers.
You should be reading FFT-Based Methods for Simulating Flicker FM by
Charles A. Greenhall of JPL. If you read it carefully enough you will
find several methods
Started plotting some sampled data from my experimental system, and
interestingly, it seems to have a 1/f^2 slope, rather than a 1/f slope.
I had expected the amplifier noise to dominate, but perhaps one of the
myriad other noise sources is contributing as well (e.g. sample clock
jitter, ADC