Mark,
Excuse my ignorance but where do I find this version?
Wes
On 6/20/2017 9:34 AM, Mark Sims wrote:
I just added the ability to calculate solid earth tides and the vertical
gravity offset due to the sun and moon to Lady Heather. The lat/lon offset is
typically around +/- 60 cm per day.
On Tue, 20 Jun 2017 16:34:14 +
Mark Sims wrote:
> I just added the ability to calculate solid earth tides and the vertical
> gravity offset due to the sun and moon to Lady Heather.
Cool! How do you calculate the displacement on a fixed position receiver?
> The lat/lon offset
> is typic
How do the GPS control/monitoring stations handle Earth tides?
My guess is they have another nearby antenna that they can link up to VLBI
data.
--
These are my opinions. I hate spam.
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Hi
Earth tides are at least as crazy a topic as time. There are formulas that will
let you incorporate
the effect of Pluto on solid Earth tides.
Bob
> On Jun 20, 2017, at 7:21 PM, Peter Vince wrote:
>
> Hi Mark,
>
> This is all new information to me - and fascinating! Have you just
> "c
Hi Mark,
This is all new information to me - and fascinating! Have you just
"calculated" the offsets (using known values from somewhere), or "measured"
it by very long term averaging of the GPS position information?
Peter Vince
On 20 June 2017 at 17:34, Mark Sims wrote:
> I just ad
I just added the ability to calculate solid earth tides and the vertical
gravity offset due to the sun and moon to Lady Heather. The lat/lon offset is
typically around +/- 60 cm per day.Vertical offset is around +/- 180mm.
Depending upon the day and where you are, the swings are not symm
From: time-nuts on behalf of Thorbjørn Pedersen
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]<
I thought there was kind of a rule about EXCLUDING sats on or near the
horizon...
__
Clay Autery, KY5G
On 6/20/2017 8:27 AM, "Björn Gabrielsson" wrote:
> Hi Thorbjörn,
>
> To bad this particula antenna has surrounding buildings (and maybe trees)
> that mask low elevation satel
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 c
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
Since 1cm of motion is equivalent to 30ps, there's probably not
On Tue, 20 Jun 2017 at 10:11 pm, Didier Juges wrote:
> If that is not time-nutty, I do not know what will :)
>
> On Jun 20, 2017 7:04 AM, "jimlux" wrote:
>
> >
> > for geodetic measurements, they drill a hole down to bedrock, and r
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
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 re
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 wi
If that is not time-nutty, I do not know what will :)
On Jun 20, 2017 7:04 AM, "jimlux" 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
>
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,
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 tem
On Mon, 19 Jun 2017 08:52:37 -0400
Dan Kemppainen wrote:
> So, what sorts of things are done for high precision survey work? I
> would guess a sturdy mount, good sky view, no reflections, good antenna,
> no nearby radiators, etc. Those all seem like common sense stuff.
I don't know about surve
Hi
If you go totally insane, you build a 30’ tall concrete monolith in the middle
of a wide open field. The antenna
and ground plane go on top of the monolith. You then grab your chain saw and
start knocking down any trees,
towers, or homes that happen to obstruct your perfect view. :) Indeed th
Hi Bob,
So, what sorts of things are done for high precision survey work? I
would guess a sturdy mount, good sky view, no reflections, good antenna,
no nearby radiators, etc. Those all seem like common sense stuff.
But for applications that really matter, what sorts of things might be
missin
Good comments by Bob.
I run 100 ft of Rohn 45 and then have a stack of rotatable antennas at that
point.
I have the antenna some 3-4 ft off the tower at 90' feeding with 1/2"
line.(Because I had it) The trees have grown to 90' so that gives a nice
clean view south. Works totally fine. Reason to kee
Hi
Will there be an effect? Yes. Are roughly 99% of all GPSDO’s run with antennas
mounted that way
by “pros” ? Yes again.
If you are setting up a reference site for high precision survey work, don’t do
it that way. For a GPSDO,
you should be fine.
Bob
> On Jun 16, 2017, at 1:17 PM, Dan Kempp
Hi All,
Fair Warning: Nuts Mode Engaged. :)
Recently we've moved to a new house and am in the process of getting the
antennas back up for various things. One of these is the GPSDO(s), and
an obvious location is somewhere on a Roan 25 tower set up just south of
the house. At about half way u
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