[time-nuts] Timing Distribution in Mountainous Terrain
stanley_reynolds at yahoo.com
Fri Sep 10 17:26:57 UTC 2010
On the crazy side another common view object is the lunar laser ranging
retroreflector array. Has been improvements in cost of lasers and telescopes in
the past 41 years and it doesn't appear to be headed for shutdown anytime soon.
----- Original Message ----
From: Mark J. Blair <nf6x at nf6x.net>
To: Discussion of precise time and frequency measurement <time-nuts at febo.com>
Sent: Fri, September 10, 2010 11:49:49 AM
Subject: Re: [time-nuts] Timing Distribution in Mountainous Terrain
I presume that there's a good reason for the selection of antenna sites which
don't have LOS to each other. However, would it be possible to select additional
sites at which to install repeaters to allow timing calibrations to be made
between pairs of primary receiving sites? These repeaters could also provide
backup communications so that a primary receiving site isn't necessarily taken
out of action if its communication channel (wireline?) gets cut by a wandering
backhoe. Each repeater site would be selected to have LOS to two or more primary
receiving sites, or when that's not possible, to one primary receiving site and
another repeater that can see a different site.
While multiplying the number of sites wouldn't be cheap (even considering that
the repeater sites may host much less expensive equipment than the primary
receiving sites, and may be able to operate without wireline communications or
power lines to the sites), it might be cheaper than installing hydrogen masers
and radio telescopes, designing custom aircraft and flying them overhead every
20 minutes, etc.
Mark J. Blair, NF6X <nf6x at nf6x.net>
Web page: http://www.nf6x.net/
GnuPG public key available from my web page.
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