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Originally Posted by DaveASA/FED
I also have to ask about the different calibration....radar guns send out waves and measure the speed with which those waves are returned to the device, basically a reflection off of the device that is moving toward the gun. So how would that be different between a small ball and a large ball? If this was true, then police better have a semi radar gun and a sub-compact car radar gun, and if they try to give me a ticket on my motorcycle I can really fight it!!!
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All radar guns must still be calibrated. For police officers, this is done by placing a tuning fork in front of the gun, supposedly every shift, to simulate a moving car and to give a particular reading.
As for on the field use of radar guns, I am not sure how the calibration is done, but it has always been my understanding that they still need to be. Perhaps my reference to calibrating for the different balls is incorrect. I remember one time being at a minor league game and the calibration of the gun was so messed up, that the readings on the pitchers were all in the 40's or so. During the bottom half of the first inning, two guys came down and worked with it, and by the second inning they had it calibrated to give the correct readings.