[time-nuts] Timing on Ethernet

[Dr Bruce Griffiths]

Thomas A. Frank wrote:
> ); SAEximRunCond expanded to false
> Errors-To: time-nuts-bounces+bruce.griffiths=xtra.co.nz at febo.com RETRY
>
> Ah, but what if one used the tunnel itself as a waveguide, and 
> propagated an RF signal down it?  Would it then reliably arrive at all 
> the points, with a known delay?
>
> Since the tunnels are probably at least ten meters wide and tall, 
> that's a pretty low frequency, which is easy to generate, and not 
> likely to interfere with any of the equipment.
>
> Interesting use for some surplus 11 meter CB gear...and no wires 
> required.
>
> Does the theory that applies to say a WR-59 waveguide apply to a large 
> tunnel?
>
> Tom Frank, KA2CDK
>   
Tom

Not exactly the "waveguide" doesnt have highly conductive walls to 
confine the RF and the presence of the accelerator beam line, magnets, 
power supplies etc and occasionally people will make calculating the 
phase of RF field at any given point somewhat challenging.

Bruce