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Originally Posted by jdw3018
I've never used PTS, but I've been told by those who have (while discussing this very topic) that the microphone specifically picks up the sound of air moving through the Fox 40 whistle - not just any sound. So, if you talk with the whistle in your mouth, while it may not blow out loud, the small amount of air moving through the whistle may be enough at that specific frequency or pitch or whatever it is that is special about the whistle to trigger the microphone. Taking the whistle out of the mouth eliminates this problem. The actual positioning of the microphone is secondary.
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That's as reasonable an explanation as I could have hoped to hear.
I understand physics at a fairly high level, and what it seems that you are saying is that the sensor is set to detect a certain range of sound wave frequency, which is really nothing more than some air getting pushed around as it exits the whistle's chambers.
So if that is the case, we have wonder what else is in that frequency range which could be interfering.