Re: [time-nuts] GPS Antenna on Tower.
http://www.sp.se/en/index/resources/GNSS/Sidor/default.aspx
Have a look at the best receiving antenna I know about.
The tower must have cooling tubes coiled around it because of the sun heating one side will make it bend away from the sun, and turn this way all day.
The cable and doom is also temperature controlled.
Best Regards
Thorbjørn W. Pedersen
I have wondered how geologists are able to measure tectonic plate movements in the earths surface to a couple cm's when the sensors from what I see/read they are nothing more than sensors in concrete boxes?. I believe they use various technologies such as Very Long Baseline Interferometryhttp://www.see.leeds.ac.uk/structure/dynamicearth/plates_move/active_tectonics/vlbi.htm (VLBI) and Satellite Laser Ranginghttp://www.see.leeds.ac.uk/structure/dynamicearth/plates_move/active_tectonics/slr1.htm (SLR)
All fascinating stuff....
-=Bryan=-
From: time-nuts time-nuts-bounces@febo.com on behalf of Thorbjørn Pedersen Thorbjorn.Pedersen@ikm.no
Sent: June 19, 2017 9:42 PM
To: time-nuts@febo.com
Subject: Re: [time-nuts] GPS Antenna on Tower.
http://www.sp.se/en/index/resources/GNSS/Sidor/default.aspx
[http://www.sp.se/sv/index/resources/GNSS/PublishingImages/pelare.jpg]http://www.sp.se/en/index/resources/GNSS/Sidor/default.aspx
GNSS-equipment - SPhttp://www.sp.se/en/index/resources/GNSS/Sidor/default.aspx
www.sp.se
GNSS-equipment RISE has equipment for GNSS (Global Navigation Satellite Systems) for applications in Time and Frequency, Positioning and Atmospheric Studies.
Have a look at the best receiving antenna I know about.
The tower must have cooling tubes coiled around it because of the sun heating one side will make it bend away from the sun, and turn this way all day.
The cable and doom is also temperature controlled.
Best Regards
Thorbjørn W. Pedersen
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for geodetic measurements, they drill a hole down to bedrock, and run a
pipe down to anchor the antenna to the bedrock.
"All holes shall be drilled straight enough so that PVC casing can be
installed in the top 15.5 ft of each hole, and that the steel pipe can
be freely lowered, not forced, for its entire 35 ft length."
http://kb.unavco.org/kb/article/deep-drilled-braced-monument-overview-300.html
http://www.scign.org/arch/sdb_monument.htm
Google for Ken Hudnutt's or Frank Webb's papers
or a 3m tall monument for a CORS station
If that is not time-nutty, I do not know what will :)
On Jun 20, 2017 7:04 AM, "jimlux" jimlux@earthlink.net wrote:
for geodetic measurements, they drill a hole down to bedrock, and run a
pipe down to anchor the antenna to the bedrock.
"All holes shall be drilled straight enough so that PVC casing can be
installed in the top 15.5 ft of each hole, and that the steel pipe can be
freely lowered, not forced, for its entire 35 ft length."
http://kb.unavco.org/kb/article/deep-drilled-braced-monument
-overview-300.html
http://www.scign.org/arch/sdb_monument.htm
Google for Ken Hudnutt's or Frank Webb's papers
or a 3m tall monument for a CORS station
http://www.mwrtk.net/support_docs/corsinstallprocedures.pdf
time-nuts mailing list -- time-nuts@febo.com
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ailman/listinfo/time-nuts
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On 6/20/17 5:11 AM, Didier Juges wrote:
If that is not time-nutty, I do not know what will :)
if you're a "real time-nut" you drill your own holes - you buy a surplus
drilling rig, refurbish it, figure out how to work it (maybe there's a
"drill-nuts" list?), etc.
But at least the station will probably fit in your backyard.
On Jun 20, 2017 7:04 AM, "jimlux" jimlux@earthlink.net wrote:
for geodetic measurements, they drill a hole down to bedrock, and run a
pipe down to anchor the antenna to the bedrock.
"All holes shall be drilled straight enough so that PVC casing can be
installed in the top 15.5 ft of each hole, and that the steel pipe can be
freely lowered, not forced, for its entire 35 ft length."
http://kb.unavco.org/kb/article/deep-drilled-braced-monument
-overview-300.html
http://www.scign.org/arch/sdb_monument.htm
Google for Ken Hudnutt's or Frank Webb's papers
or a 3m tall monument for a CORS station
http://www.mwrtk.net/support_docs/corsinstallprocedures.pdf
time-nuts mailing list -- time-nuts@febo.com
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ailman/listinfo/time-nuts
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It was bright sunshine and 46 degrees C here in the desert near Tucson, Arizona
yesterday. It would take a lot of cooling to keep that solar collector (radome)
cool.
Wes Stewart
On 6/19/2017 9:42 PM, Thorbjørn Pedersen wrote:
http://www.sp.se/en/index/resources/GNSS/Sidor/default.aspx
Have a look at the best receiving antenna I know about.
The tower must have cooling tubes coiled around it because of the sun heating one side will make it bend away from the sun, and turn this way all day.
The cable and doom is also temperature controlled.
Best Regards
Thorbjørn W. Pedersen
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and follow the instructions there.
LOL!!! My first reaction to reading the drill for sub-subterranean GPS
mast was...
Wonder if I could borrow Shappell's little drilling rig to do THAT hole
and the vertical wells for the geo-thermal cooling loops?
Followed closely by...
Wonder what kind and number of Sorbothan, et al. dampers required to
damp the locally generated vibrations that would resonate in that length
"tuning fork" hooked to the bedrock?
<big grin> Even we non-scientists on this reflector reserve the right
to be equally nutty. <wink>
PS - I have a master map of my back yard in order to manage the
available square footage and its use and to de-conflict the
sub-subterranean "air space".
Clay Autery, KY5G
On 6/20/2017 7:21 AM, jimlux wrote:
On 6/20/17 5:11 AM, Didier Juges wrote:
If that is not time-nutty, I do not know what will :)
if you're a "real time-nut" you drill your own holes - you buy a
surplus drilling rig, refurbish it, figure out how to work it (maybe
there's a "drill-nuts" list?), etc.
But at least the station will probably fit in your backyard.
Since 1cm of motion is equivalent to 30ps, there's probably not
On Tue, 20 Jun 2017 at 10:11 pm, Didier Juges shalimr9@gmail.com wrote:
If that is not time-nutty, I do not know what will :)
On Jun 20, 2017 7:04 AM, "jimlux" jimlux@earthlink.net wrote:
for geodetic measurements, they drill a hole down to bedrock, and run a
pipe down to anchor the antenna to the bedrock.
"All holes shall be drilled straight enough so that PVC casing can be
installed in the top 15.5 ft of each hole, and that the steel pipe can be
freely lowered, not forced, for its entire 35 ft length."
http://kb.unavco.org/kb/article/deep-drilled-braced-monument
-overview-300.html
http://www.scign.org/arch/sdb_monument.htm
Google for Ken Hudnutt's or Frank Webb's papers
or a 3m tall monument for a CORS station
http://www.mwrtk.net/support_docs/corsinstallprocedures.pdf
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/m
ailman/listinfo/time-nuts
and follow the instructions there.
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Try again ...,
Since 1cm of motion is equivalent to 30 ps, there's probably not much point
in putting your GNSS antenna on a geodetic monument if all you care about
is timing. But it does matter if you're trying to track continental drift.
Michael
On Tue, 20 Jun 2017 at 10:44 pm, Michael Wouters michaeljwouters@gmail.com
wrote:
Since 1cm of motion is equivalent to 30ps, there's probably not
On Tue, 20 Jun 2017 at 10:11 pm, Didier Juges shalimr9@gmail.com wrote:
If that is not time-nutty, I do not know what will :)
On Jun 20, 2017 7:04 AM, "jimlux" jimlux@earthlink.net wrote:
for geodetic measurements, they drill a hole down to bedrock, and run a
pipe down to anchor the antenna to the bedrock.
"All holes shall be drilled straight enough so that PVC casing can be
installed in the top 15.5 ft of each hole, and that the steel pipe can
be
freely lowered, not forced, for its entire 35 ft length."
http://kb.unavco.org/kb/article/deep-drilled-braced-monument
-overview-300.html
http://www.scign.org/arch/sdb_monument.htm
Google for Ken Hudnutt's or Frank Webb's papers
or a 3m tall monument for a CORS station
http://www.mwrtk.net/support_docs/corsinstallprocedures.pdf
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/m
ailman/listinfo/time-nuts
and follow the instructions there.
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Hi Thorbjörn,
To bad this particula antenna has surrounding buildings (and maybe trees)
that mask low elevation satellites.
--
Björn
http://www.sp.se/en/index/resources/GNSS/Sidor/default.aspx
Have a look at the best receiving antenna I know about.
The tower must have cooling tubes coiled around it because of the sun
heating one side will make it bend away from the sun, and turn this way
all day.
The cable and doom is also temperature controlled.
Best Regards
Thorbjørn W. Pedersen
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.