[time-nuts] Steve's new QTH...
rk at timing-consultants.com
Wed Sep 8 12:51:28 UTC 2010
Got this post 5 times - you still getting aftershocks??
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Steve Rooke
Sent: 07 September 2010 11:06 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Steve's new QTH...
On 8 September 2010 01:45, Burt I. Weiner <biwa at att.net> wrote:
> 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.
With that in mind I've just changed the default 10 deg elevation mask angle
to 30 deg and will see what effects that has. Looking closely at the antenna
mounting I cannot see any change in it's angle or position but there may
have been some movement of this area as we are on an artificial bank
abutting the wetland wildfowl park. What I really need is a real GPS survey
system to determine my correct location.
> 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
Yes, it really brings it home that we live on just the skin of a rice
pudding. This sort of thing must be a nightmare for the ground stations in
control of the GPS system. What happens if the 0 deg meridian (used to be
the Greenwich meridian) physically moves, do they account for this I wonder.
Considering that the American continent and Europe/Africa are constantly
moving apart, and Asia and the Americas are moving closer, this must mean
that the position of basically most places on the Earth are constantly
changing anyway. Makes you feel like saying, where am I today.
> Burt, K6OQK
>> Date: Tue, 7 Sep 2010 18:08:31 +1200
>> From: Steve Rooke <sar10538 at 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,
> Burt I. Weiner Associates
> Broadcast Technical Services
> Glendale, California U.S.A.
> biwa at att.net
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Steve Rooke - ZL3TUV & G8KVD
The only reason for time is so that everything doesn't happen at once.
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