Re: [time-nuts] ublox NEO-M8T improved by insulated chamber?

On Wed, 8 Nov 2017 14:24:08 -0600 "Chris Caudle" wrote: > On Wed, November 8, 2017 12:55 pm, Gary E. Miller wrote: > > I knew about the errata, I left out that detail to see when someone > > actually read my citation. > > OK, I don't want to quibble about versions, and

Re: [time-nuts] ublox NEO-M8T improved by insulated chamber?

On Tue, 7 Nov 2017 22:07:43 + Leo Bodnar wrote: > Coincidentally, I have been testing relative phase difference of two GPS > clocks > http://www.leobodnar.com/shop/index.php?main_page=product_info=107_id=301 > since Friday. > They are completely independent, including

Re: [time-nuts] ublox NEO-M8T improved by insulated chamber?

On Wed, November 8, 2017 12:55 pm, Gary E. Miller wrote: > I knew about the errata, I left out that detail to see when someone > actually read my citation. OK, I don't want to quibble about versions, and whether the "latest version" is 200H or 200H including errata, but I think we both agree that

Re: [time-nuts] ublox NEO-M8T improved by insulated chamber?

Yo Tom! On Wed, 8 Nov 2017 09:31:01 -0800 "Tom Van Baak" wrote: > > How exactly do you measure offset of your GPS time output to > > absolute UTC time? > > Conceptually it's no different from measuring your favorite resister > or thermometer: you compare your DUT against

Re: [time-nuts] ublox NEO-M8T improved by insulated chamber?

Yo Chris! On Wed, 8 Nov 2017 11:47:05 -0600 "Chris Caudle" wrote: > On Wed, November 8, 2017 10:45 am, Gary E. Miller wrote: > > No one here has yet bothered to address the issues I raise > > in Section 3.3.4. > > Sure they did. Why are you referencing the old version

Re: [time-nuts] ublox NEO-M8T improved by insulated chamber?

On Wed, November 8, 2017 10:45 am, Gary E. Miller wrote: > No one here has yet bothered to address the issues I raise > in Section 3.3.4. Sure they did. Why are you referencing the old version instead of the newer version that Leo Bodner provided the link to?

Re: [time-nuts] ublox NEO-M8T improved by insulated chamber?

> How exactly do you measure offset of your GPS time output to absolute UTC > time? Conceptually it's no different from measuring your favorite resister or thermometer: you compare your DUT against a standard REF and the difference is your error, a process called calibration. So the same is

Re: [time-nuts] ublox NEO-M8T improved by insulated chamber?

Yo jimlux! On Wed, 8 Nov 2017 06:33:19 -0800 jimlux wrote: > On 11/7/17 8:39 PM, Gary E. Miller wrote: > > Yo Tom! > > > > On Tue, 7 Nov 2017 20:16:09 -0800 > > "Tom Van Baak" wrote: > > > >>> Which is small compared to the published GPS time

Re: [time-nuts] ublox NEO-M8T improved by insulated chamber?

On 11/7/17 8:39 PM, Gary E. Miller wrote: Yo Tom! On Tue, 7 Nov 2017 20:16:09 -0800 "Tom Van Baak" wrote: Which is small compared to the published GPS time resolution (IS_GPS_200H, page 54) of 90 ns. Correct. GPS performs far better than the original spec. Like the

Re: [time-nuts] ublox NEO-M8T improved by insulated chamber?

> Subject: Re: [time-nuts] ublox NEO-M8T improved by insulated chamber? I have not read IS-GPS for quite awhile so out of curiosity found what I believe is the latest one https://www.gps.gov/technical/icwg/IRN-IS-200H-001+002+003_rollup.pdf It states "The OCS shall control the GPS ti

Re: [time-nuts] ublox NEO-M8T improved by insulated chamber?

Hi, Jim! On Wed, Nov 8, 2017 at 3:12 AM, jimlux wrote: > > http://www.navipedia.net/index.php/Ionospheric_Delay > has a nice discussion with simple equations to turn TEC into delay, etc. > I've already skimmed this, and it requires a bit more brainpower than I can muster

Re: [time-nuts] ublox NEO-M8T improved by insulated chamber?

On Tue, Nov 7, 2017 at 8:39 PM, Gary E. Miller wrote: > Yo Tom! > > On Tue, 7 Nov 2017 20:16:09 -0800 > "Tom Van Baak" wrote: > >> > Which is small compared to the published GPS time resolution >> > (IS_GPS_200H, page 54) of 90 ns. >> >> Correct. GPS

Re: [time-nuts] ublox NEO-M8T improved by insulated chamber?

Yo Tom! On Tue, 7 Nov 2017 20:16:09 -0800 "Tom Van Baak" wrote: > > Which is small compared to the published GPS time resolution > > (IS_GPS_200H, page 54) of 90 ns. > > Correct. GPS performs far better than the original spec. Like the > Mars rovers... Of course, but

Re: [time-nuts] ublox NEO-M8T improved by insulated chamber?

On 11/7/17 1:44 PM, MLewis wrote: Yo Gary! With a strictly SSE skyview, I still regularly get signals from sats to my NW. When they're at the right elevation and heading, their signals pass over me and reflect back at me from a tall building. When running my M8T with the position unlocked,

Re: [time-nuts] ublox NEO-M8T improved by insulated chamber?

On 11/7/17 1:30 PM, Ole Petter Ronningen wrote: Not knowing better, I would expect there to be diurnal effects due to the ionospere being in the shade or not. I suspect there are people on this list that know better. Anyway, the effect I am seeing is also very slowly drifing, see screenshot of

Re: [time-nuts] ublox NEO-M8T improved by insulated chamber?

Yo MLewis! On Tue, 7 Nov 2017 16:44:05 -0500 MLewis wrote: > With a strictly SSE skyview, I still regularly get signals from sats > to my NW. When they're at the right elevation and heading, their > signals pass over me and reflect back at me from a tall building. > When

Re: [time-nuts] ublox NEO-M8T improved by insulated chamber?

Coincidentally, I have been testing relative phase difference of two GPS clocks http://www.leobodnar.com/shop/index.php?main_page=product_info=107_id=301 since Friday. They are completely independent, including separate antennas and positioned a few yards away from each other so ionospheric

Re: [time-nuts] ublox NEO-M8T improved by insulated chamber?

On Tue, November 7, 2017 3:30 pm, Ole Petter Ronningen wrote: > Not knowing better, I would expect there to be diurnal effects due to the > ionospere being in the shade or not. I think that is generally true. > Anyway, the effect I am seeing is also very slowly drifting, see screenshot > of

Re: [time-nuts] ublox NEO-M8T improved by insulated chamber?

Yo Gary! With a strictly SSE skyview, I still regularly get signals from sats to my NW. When they're at the right elevation and heading, their signals pass over me and reflect back at me from a tall building. When running my M8T with the position unlocked, and those NW sats are getting a

Re: [time-nuts] ublox NEO-M8T improved by insulated chamber?

Yo Lars! On Tue, 7 Nov 2017 20:32:19 + Lars Walenius wrote: > Another question: If You have an error in the surveyed position of > say 3meters and you receive all of the available satellites in all > directions how much will this really affect your timing? I'll

Re: [time-nuts] ublox NEO-M8T improved by insulated chamber?

n appareil mobile Samsung. >> >> Message d'origine >> De : Ole Petter Ronningen <opronnin...@gmail.com> >> Date :07/11/2017 15:15 (GMT+01:00) >> A : Discussion of precise time and frequency measurement < >> time-nuts@febo.com> >> Obje

Re: [time-nuts] ublox NEO-M8T improved by insulated chamber?

- Message d'origine >> De : Ole Petter Ronningen <opronnin...@gmail.com> >> Date :07/11/2017 15:15 (GMT+01:00) >> A : Discussion of precise time and frequency measurement < >> time-nuts@febo.com> >> Objet : Re: [time-nuts] ublox NEO-M8T improved by insula

Re: [time-nuts] ublox NEO-M8T improved by insulated chamber?

> > Envoyé depuis mon appareil mobile Samsung. > > Message d'origine > De : Ole Petter Ronningen <opronnin...@gmail.com> > Date :07/11/2017 15:15 (GMT+01:00) > A : Discussion of precise time and frequency measurement < > time-nuts@febo.com> >

Re: [time-nuts] ublox NEO-M8T improved by insulated chamber?

Ronningen <opronnin...@gmail.com> Date :07/11/2017 15:15 (GMT+01:00) A : Discussion of precise time and frequency measurement <time-nuts@febo.com> Objet : Re: [time-nuts] ublox NEO-M8T improved by insulated chamber? Hi all Attached is a 24 hour plot of PPS out from a UBlox 6T agains

Re: [time-nuts] ublox NEO-M8T improved by insulated chamber?

Hi all Attached is a 24 hour plot of PPS out from a UBlox 6T against a hydrogen maser. From 00:00 the bare receiver board was inside a polystyrene box where it has soaked for many months, at 16:00 I removed the box exposing the board to the airflow in the room, including AC. The box was left off

Re: [time-nuts] ublox NEO-M8T improved by insulated chamber?

[I hate finding unsent email in my folder :-] Others may disagree, but I doubt that the type of small temperature variation you are referring to has any meaningful effect on tracking. While the datasheet for the M8T says that there can be "significant impact" to the specifications at “extreme

Re: [time-nuts] ublox NEO-M8T improved by insulated chamber?

Hi There always is a …. but …. When you slow down the temperature change process, you increase the length of hanging bridges on the pps output. That might not be a big deal with NTP or in an application that uses the sawtooth correction message. In an application where a post filter process is

Re: [time-nuts] ublox NEO-M8T improved by insulated chamber?

> From: MLewis > Is this coincidence or can reception improve with: > - a higher temperature module? > - a more stable module temperature? Short answer: #2 Long answer: Ublox firmware tracks gradual shifts in its reference frequency (XO, TCXO or external input) and adjusts LO base offset to

Re: [time-nuts] ublox NEO-M8T improved by insulated chamber?

Yo MLewis! On Thu, 2 Nov 2017 21:54:57 -0400 MLewis wrote: > I have no idea what the temperature is inside the chamber. I use the 'temper' to know what temp is in my GPS chamber: https://www.amazon.com/TEMPer-USB-Thermometer-w-Alerts/dp/B002VA813U I use that, and an

Re: [time-nuts] ublox NEO-M8T improved by insulated chamber?

Earlier this week, I put the breakout board with my NEO-M8T into an aluminum can. The can is split into a lower half and an upper half. The lower half was insulated on its sides internally, but open to the upper half, which wasn't insulated. The lower area contains the NEO-M8T on its breakout