[time-nuts] Using digital broadcast TV for timing?

[Hal Murray]

> Maybe cell site transmissions are better?

At least one company makes them.

http://tinyurl.com/72j5e6n
http://www.endruntechnologies.com/telecom-primary-reference-source.htm

It's CDMA.  I don't know much about cell phones, but I think that's the old 
protocol that will probably/eventually fade away.

I don't know anybody who has worked with them.  The advantage is that you can 
set them up in your machine room and don't need an outside antenna.  (If your 
cell phone works there, this should work too.)

I'd expect the time accuracy would be not as good as GPS.  It would be off by 
the time-of-flight from the cell tower, 5 microseconds per mile.  That's 5 
microseconds per mile which is no problems unless you are a time-nut.  (I 
don't know if the cell towers add more to that.)


-- 
These are my opinions, not necessarily my employer's.  I hate spam.