Sites communicate via landline telco. If there are sufficient mutually
visible networked sites to form a solution on an aircraft visible to
stations not in the timing network that would work, and is one of the
options we are studying.
May it be assumed that the sites are on the regular electric grid?
If so, being within 300 miles of each other suggests that they are
most likely all on the SAME section of the grid, in which case the
phase time of arrival of the electric power waveform should be
constant between them (the zero crossing may not be perfectly
aligned, but it should always be the same differential).
Whether you can measure it to within 30 ns I'm not sure...
Simpler thought - is the telco fiber? Could they drop a second
dedicated one to link the sites?
The notion that GPS will suddenly 'go away', without any other issues
being present, is rather silly. That same solar flare that takes out
GPS for all your sites is going to most likely render your other gear
inoperative as well...
Tom Frank, KA2CDK
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