On 09/03/2013 11:47 PM, Tom Van Baak wrote: >> Nowhere does the opinion mention if the timestamps were taken on >> the same clock or if the two clocks were synchronized. > PHK, > > Correct. This is an age-old problem, whether its minutes or nanoseconds. > Time-stamps are inherently relative to a local oscillator's time and rate > offset, and affected by frequency drift and stability levels. > > A solution to this problem is for the "first responder" to take the cell > phone(s) and simultaneously send a text message to himself from each phone. > That could help establish a legal time difference (unless, there are variable > reception or carrier-specific delays). > > They could also simultaneously send cell phone photos of a handheld GPS > receiver's time display. That could help establish a legal time accuracy > question (unless, the cell phone or GPS receiver were in some sort of > hold-over mode). > > For extra credit, further photos can be sent each hour for hours or days to > determine the cell phone frequency drift and stability parameters. > > Then again, realize that a jury of your fellow citizens, not a jury of your > "peers", will decide the question of timing. Thus to raise technical issues > like syntonization vs. synchronization, or standard vs. Allan deviation, or > GPS vs. UTC clocks will probably not help your case. "Who is this Allan whos deviation is this or that value?"
Yeah, the question is even if you have a legal support for what correct time or even traceable time actually is or means. I know countries that does not even legally accept UTC. It could be better, way better. Cheers, Magnus _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
