[time-nuts] Timing Distribution in Mountainous Terrain

Mark Spencer mspencer12345 at yahoo.ca
Fri Sep 10 21:59:20 UTC 2010

First thought is that the doppler shift associated with sky wave propogation will likely present issues.    Wwvb might be a better choice if locking an oscilator to a received rf carrier will work.

On Fri Sep 10th, 2010 5:04 PM EDT Ralph Smith wrote:

>OK, stop me if this is really stupid. The initial site is in Colorado.
>Would it be possible to use WWV? In particular:
>1) Lock a reference to the carrier of one of the WWV signals
>2) Generate PPS off of WWV-locked reference
>3) Periodically send difference of GPSDO PPS and WWV-locked PPS home,
>along with GPS lock indication
>4) When GPS goes away do the math at home and correct for the timing drift
>of the GPSDO compared to WWV-locked reference
>There are probably several fatal flaws with this approach. In particular,
>the following are required:
>1) Ability to maintain constant lock to WWV
>2) Common-mode error. Will the propagation from WWV be similar enough for
>all stations to it be a practical common reference.
>3) Adequate resolution. Even if, for some reason 1 and 2 are possible,
>would the result be good enough to use.
>Like I say, probably completely unworkable, but what are your thoughts?
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