[time-nuts] Timing Distribution in Mountainous Terrain

scmcgrath at gmail.com scmcgrath at gmail.com
Thu Sep 9 17:33:26 UTC 2010


If you need that kind of timing accuracy in the absence of GPS then Cs is probably the only answer.   Dark fiber would also work but the infrastructure and fiber leasing costs would probably be much more expensive than local Cs
Sent from my Verizon Wireless BlackBerry

-----Original Message-----
From: "Ralph Smith" <ralph at ralphsmith.org>
Sender: time-nuts-bounces at febo.com
Date: Thu, 9 Sep 2010 12:48:54 
To: Discussion of precise time and frequency measurement<time-nuts at febo.com>
Reply-To: Discussion of precise time and frequency measurement
	<time-nuts at febo.com>
Subject: Re: [time-nuts] Timing Distribution in Mountainous Terrain

The network is spread over about 250-300 US miles.

Ralph

On Thu, September 9, 2010 12:01 pm, Didier Juges wrote:
> How widely spread is your network?
>
> ------------------------
> Sent from my BlackBerry Wireless thingy while I do other things...
>
> -----Original Message-----
> From: "Ralph Smith" <ralph at ralphsmith.org>
> Sender: time-nuts-bounces at febo.com
> Date: Thu, 9 Sep 2010 11:37:46
> To: <time-nuts at febo.com>
> Reply-To: Discussion of precise time and frequency measurement
> 	<time-nuts at febo.com>
> Subject: [time-nuts] Timing Distribution in Mountainous Terrain
>
> We have a requirement for approximately ten radio sites to be synchronized
> to within 30 ns of each other. Ordinarily you could throw in an
> appropriate GPSDO and be done with it. However, we also have the
> reqirement to be able to operate independent of GPS for up to six days. If
> we were able to have each site within line of sight of another, and could
> form a network including all sites, we could do differential time
> measurement between the mutually visible sites and correct in that way.
> Unfortunately, that is not the case. Absolute time accuracy is not
> critical, but relative time accuracy is. Does anyone out there have any
> ideas?
>
> Thanks,
> Ralph
> AB4RS
>
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