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 whether the "latest
> vers
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&cPath=107&products_id=301
> since Friday.
> They are completely independent, including separ
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
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 a standard REF and th
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 instead of the
> newer
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?
https://www.gps.gov/technical/icwg/I
> 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 tru
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 resolution
> >>> (IS_GPS_200H, page 54) of 90 ns
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
Mars rovers...
Of cours
> 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
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 for what I want to acco
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 performs far better than the original spec. Li
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 then you are on a wing a
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, an
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 a
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 running my M8T with the
Coincidentally, I have been testing relative phase difference of two GPS clocks
http://www.leobodnar.com/shop/index.php?main_page=product_info&cPath=107&products_id=301
since Friday.
They are completely independent, including separate antennas and positioned a
few yards away from each other so
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 about
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
refl
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 oversimply a bit by repeating
ter Ronningen
>> 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 ho
ter Ronningen
>> 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
depuis mon appareil mobile Samsung.
>
> Message d'origine
> De : Ole Petter Ronningen
> 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
etter Ronningen
Date :07/11/2017 15:15 (GMT+01:00)
A : Discussion of precise time and frequency measurement
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 against a hydrogen
maser. From 00:00 the bare receiver boar
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
f
[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 o
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 e
> 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 com
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 incadescent light bulb, to
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 b
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