Steve,
Depending on the type of antenna used for your GPS, you might want to
check the Zenith or vertical angle, and if possible, compare that to
pre-quake positioning. Your antenna may now be seeing a change in
multipath from some nearby environmental change (no pun intended
under the circumstances) that could cause a difference in reflected
signals arriving at the antenna.
Many years ago I ran into a combined group on Mt. Wilson, our local
broadcast farm in the mountains, from Cal Tech and MIT that was
measuring the movement between Southern California mountains using
lazers. While this was scientifically fascinating, it gave me the willies.
Burt, K6OQK
Date: Tue, 7 Sep 2010 18:08:31 +1200
From: Steve Rooke <sar10...@gmail.com>
Subject: Re: [time-nuts] Freestanding mast
Well, Steve has been experiencing a LOT of after-shocks, some of which
are still big enough to move things around and I found I had to grab
hold of my cup of tea to stop it shaking onto the floor last night. In
fact these after-shocks are still opening up new cracks in roads and
causing buildings to fall.
As for my height position, I have run a few surveys but I'm getting
varying readings and I wonder if the after-shocks are messing up the
survey results. The latest one which was during a fairly stable period
was 6.8 MSL.
The mast could have sunk a bit or even this whole area could have done
as I live on reclaimed marsh-land. My Mothers 3 year old house looks
like it has sunk a bit at one and and risen at the other, ie. it looks
like it has tipped slightly as her house is built on a concrete
pontoon.
It wouldn't surprise me if they adjust the height of MSL but I would
have thought they would have moved it the other way in an attempt to
forestall fears of the effects of Global Warming.
Regards from Quake City,
Steve
Burt I. Weiner Associates
Broadcast Technical Services
Glendale, California U.S.A.
b...@att.net
www.biwa.cc
K6OQK
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