> Just a thought...
> I wounder if real lighthouses would blink in absolute sync ?
>
> one directly behind each LED, running on the INTOSC. Then you'd
> get a natural "drift" between the lighthouses :-) :-)

I would expect most if not all lighthouses will now be automated and
unmanned (true in NZ) and probably linked via DGPS. You'd have
to look at individual lighthouses to determine how their timing is derived
(for example DGPS or mains cycles) for not ony the flash but also radio
beacons. My guess would be some sort of PLC standard that takes
full advantage of DGPS timing. After all, if you're putting time and money
into modernising a lighthouse network you'd want it state-of-the-art

So, that leaves Aslam with a choice - build as it probably is, with all
the LED timings in synch (but not necessarily flashing in chorus - a little
boring) by having a common line between the PICs or have it slightly
"drifty", perhaps how it could have been pre-GPS. Alhough you'd have
to be watching for quite a while to see it drift

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