Hi These days the easiest solution might be to put an Ethernet device a few floors up (where you can see the sky) and haul packets on down to the bottom of the canyon.
Bob -----Original Message----- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Chris Albertson Sent: Tuesday, February 07, 2012 9:01 PM To: Discussion of precise time and frequency measurement Subject: [time-nuts] Using digital broadcast TV for timing? GPS requires a good view of the sky, Hard to do in say the 7th floor of a 40 story building if you have no windows. I'm wondering about using the new digital TV signals for timing. I'm pretty sure there is time code in the signal and I'm pretty sure the bits are clocked at a very accurate rate. Also TV receivers are very easy to find and put "hooks" into. I'd bet the broadcast TV signal could be almost as good as GPS. The plan is to try and phase lock a local oscillator and use a very long time constant on the loop filter. I bet the TV transmitters are locked to GPS and over a long enough time are as good as GPS. Also in many cities there are many TV transmitters, should be able to take advantage of that. Before I try some experiments anyone want to tell me why I'm wrong? -- Chris Albertson Redondo Beach, California _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.