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Perry Mick wrote:
I did that too way back when. I was told I need to run it's output through a spectrum analyzer. Audio frequencies so an audio spectrum analyzer would work. You could input to the audio card in a PC and use a PC audio spectrum analyzer.
Ed,
You were calculating the position of your discs by estimating the temperature in the exhaust and such. Have you thought about using Perry's method? Record the sound and analyze that to get the exhaust frequencies that are actually present. It seems that it would also have the advantage of telling precisely which ones were stongest and in need of attenuation.
--
http://www.ernest.isa-geek.org/
"This is by far the hardest lesson about freedom. It goes against
instinct, and morality, to just sit back and watch people make
mistakes. We want to help them, which means control them and their
decisions, but in doing so we actually hurt them (and ourselves)."
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