[time-nuts] Timing on Ethernet

Bob Paddock bob.paddock at gmail.com
Mon Aug 6 05:54:27 EDT 2007


On Sunday 05 August 2007 12:13, Poul-Henning Kamp wrote:

> >We found the best "waveguide" experience was in
> >the range of 300 to 420 MHz, but the distance is very limited,
> >hundreds of feet at most.  The main problem at different frequencies
> >is the material becomes absorptive at lower frequencies,
> >or reflective at higher frequencies causing to much mutilpath
> >distortion.
> 
> Most mines are in coal or metalrich rock, wouldn't that make
> your experience more pessimistic than the tunnels at CERN which,
> as far as I remember, is in pretty 'worthless' rock ?

To get to the Coal Face there are miles of tunnels that have neither
coal nor metallic bearing Rock.  Radio transmissions there don't do much
better than near the Coal/Metallic Rock.


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