Re: [time-nuts] GPS Antenna on Tower.

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.

Re: [time-nuts] GPS Antenna on Tower.

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

Re: [time-nuts] GPS Antenna on Tower.

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. ___ time-nuts mailing list -- time-nuts@febo.com To

Re: [time-nuts] GPS Antenna on Tower.

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

Re: [time-nuts] GPS Antenna on Tower.

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

Re: [time-nuts] GPS Antenna on Tower.

___ From: time-nuts <time-nuts-boun...@febo.com> on behalf of Thorbjørn Pedersen <thorbjorn.peder...@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.

Re: [time-nuts] GPS Antenna on Tower.

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

Re: [time-nuts] GPS Antenna on Tower.

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

Re: [time-nuts] GPS Antenna on Tower.

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

Re: [time-nuts] GPS Antenna on Tower.

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

Re: [time-nuts] GPS Antenna on Tower.

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

Re: [time-nuts] GPS Antenna on Tower.

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: [time-nuts] GPS Antenna on Tower.

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

Re: [time-nuts] GPS Antenna on Tower.

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

Re: [time-nuts] GPS Antenna on Tower.

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,

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

Re: [time-nuts] GPS Antenna on Tower.

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.

Re: [time-nuts] GPS Antenna on Tower.

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

Re: [time-nuts] GPS Antenna on Tower.

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

Re: [time-nuts] GPS Antenna on Tower.

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

Re: [time-nuts] GPS Antenna on Tower.

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