[time-nuts] Using digital broadcast TV for timing?
lists at digitalelectric.com.au
Wed Feb 8 02:50:29 UTC 2012
You might be able to find the PCR clock at 90kHz, but.. PCR clocks are usually just decent oscillators, nothing special.
> 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
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