Thanks, fantastic idea. It wont be possible to install GPS recievers on
every node, (will be 200+) however a couple of these in the network could
solve some of our problems. Regretably some of the locations this system
will be installed are underground (hench why WWVL wasnt an option) however
I should be able to get a GPS receiver to the surface at a handful of
locations around the network, and use this as the time sync to relay to
the other nodes.

Thanks for a fantastic idea!!

Mat


> Another possibility is to put a GPS timing receiver (e.g. Trimble
> Resolution-T) at each remote site. These are very easy to interface,
> and will synchronize to within well under a microsecond. GPS signals
> are available everywhere in the world (unless you're underground, or
> something).
>
> You don't need to have the GPS contiouously powered either. You can
> use it to discipline your local clock. For example, you could power up
> the GPS once per week if you like, to resynchronize your local clock.
> You can also wake up the GPS if there's ever a power failure, to
> reacquire the absolute time. Or if you have enough power, just leave
> it running all the time. Or run it whenever there's enough sunlight
> for solar power.
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