Ralph-- As far as getting a signal through mountainous terrain, look at NVIS antennas for HF -- we use them for Field Day for just that kind of communications, 200 - 300 miles in mountainous terrain. Figuring out propagation delays is going to be interesting with NVIS though.
73 de Bob K6RTM ------------------------------ Message: 3 Date: Thu, 9 Sep 2010 11:37:46 -0400 From: "Ralph Smith" <[email protected]> Subject: [time-nuts] Timing Distribution in Mountainous Terrain To: [email protected] Message-ID: <[email protected]> Content-Type: text/plain;charset=iso-8859-1 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 _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
