Originally Posted by drakulie
You're right. And I just realized we don't know how far the fence is from the baseline on the serve with the goofy camera guy. The fence on mine is a little over 21 feet from the baseline.
Phew. Checking the accuracy of a radar gun with a stopwatch sounded akin to checking the accuracy of a nuclear clock with a home-made sun-clock!
(Other factors that would have came into play - other than distance to fence - would have been ball, spin, surface.... and sure, the first two can come into it with the gun, but not nearly as much as when calculating average speed which includes the bounce & associated decceleration).