[time-nuts] Re: GPS failed

rs ago. Good quality surveying antennas often has quite decent filtering on each band they are designed for. /Björn ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe send an email to time-nuts-le...@lists.febo.com

[time-nuts] Re: GPS failed

Hi Matthias, There has been interference reported and resolved between 23cm and Galileo, which have signals in the 23cm band. /Björn Sent from my Phone > On 12 Jul 2022, at 09:20, Matthias Welwarsky via time-nuts > wrote: > > Hi, > > if you're worried about in

[time-nuts] Re: GPS Elevation Mask Values.

. Kind regards Björn Sent from my iPhone > On 21 Nov 2021, at 16:34, Keelan Lightfoot wrote: > [...] > So if the receiver reports that a satellite is > flying over the north pole, or that it is somehow observable when it's in > the southern hemisphere, it's because of ba

[time-nuts] Re: GPS D (i.e. gpsd) roll over bug..Oct 24th

designed now yes. For one designed in the 70-ties, still running the show No. Not in my view. /Björn ___ time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send an email to time-nuts-le...@lists.febo.com To unsubscribe, go

[time-nuts] Re: HP Z3801A - Dead GPS Receiver - Oncore VP

Björn Sent from my iPhone > On 12 Oct 2021, at 16:58, Bob kb8tq wrote: > > Hi > > I’m not suggesting that there is no issue. If this had been > known to the original designers or users, routine shutdowns > and restarts would have been a show stopper. > >

[time-nuts] Re: GPS antenna question

and by running that for a day you will get good information on how your receiver likes that antenna spot. /Björn Sent from my iPhone > On 23 Jul 2021, at 03:01, Robert DiRosario wrote: > > If I want to use GPS for time and frequency standards, just how solidly does > the

[time-nuts] Re: Symmetricom NTS-150 Network Time Server Report

server but offset it with 1024wk. That should bring back a useful ntp-service. /Björn ___ time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send an email to time-nuts-le...@lists.febo.com To unsubscribe, go to and follow the instructions there.

[time-nuts] Re: Symmetricom NTS-150 Network Time Server

Hi Ben, Symmetricom/Microsemi/Microchip has delivered NTP boxes with 12VDC antenna voltage only a few years ago. Looking at Antcom antennas most of them run on anything between 2.5 and 24V, iirc. /Björn Sent from my iPhone > On 8 Jul 2021, at 14:20, Ben Hall wrote: > Good morni

[time-nuts] Re: GPS antenna distribution???

Sending something like this to google ”gps splitter site:febo.com” is a good start to search the archives. /Björn Sent from my iPhone > On 27 Jun 2021, at 06:47, wb...@gci.net wrote: > > A DuckDuckGo or Goggle searco on "gps antenna split" will give you more than

[time-nuts] Re: PN measurement thesis published

ee his 'The awful german > language'. > > Cheers > Detlef Pre WWII and a surpringly long afterwards German was the “first” foreign language for engineering in at least Northern Europe. A few German language course books remained in use into the 60s when my parents studied for

Re: [time-nuts] World's most precise.... wall clock

Then SNR is also not always comparable between manufacturers and models. Kind regards, Björn ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.

Re: [time-nuts] ISS NTP operation problems.

it the current list - but could not find it. https://www.wassenaar.org/app/uploads/2020/12/Public-Docs-Vol-II-2020-List-of-DU-Goods-and-Technologies-and-Munitions-List-Dec-20-3.pdf Did I miss it or has it moved somewhere else? Kind regards, Björn Sent from my iPhone > On 9 Jan 2021, at 00

Re: [time-nuts] L1/L2 survey antenna $125 new

http://www.geopp.com/pdf/gppigs06_pabs_g.pdf /Björn Sent from my iPhone > On 14 Nov 2020, at 08:12, Tim S wrote: > > I'd doubt it's a choke-plate design - too small, and it looks like > other Cheap dual-element designs I've seen come out of China. I don't > agree

Re: [time-nuts] ! PPS Source

(At least older) Novatel receivers can be set to lock the internal oscillator. /Björn Sent from my iPhone > On 13 Aug 2020, at 18:26, David C. Partridge > wrote: > > IIRC the Thunderbolt DOES lock its internal clock to the GP

Re: [time-nuts] eLORAN in the Antipodes ? (was: Re: eLORAN will be on the air GRI 99600)

Are not South Korea are building one? new eLoran chain? Are they transmitting? But don’t underestimate the distances from south east Asia to the far side of Australia. /Björn Sent from my iPhone > On 7 Aug 2020, at 10:24, Poul-Henning Kamp wrote: > >  > Hugh Ble

Re: [time-nuts] Using speaker / earphone for PPS testing (not a question)

Hi, 20us length is a mil standard. Described in ICD-GPS-060. /Björn Sent from my iPhone > On 21 Apr 2020, at 13:37, Bob kb8tq wrote: > > Hi > > One of the simplest justifications I can think of for a dirt cheap “Chinese” > digital ’scope is to capture short burst stu

Re: [time-nuts] Microsemi XLi SAASM

compensation. /Björn Sent from my iPhone >>> On 28 Mar 2020, at 23:01, kb...@n1k.org wrote: >> Hi >> >> Just a guess, but I'd bet the answer is no. >> >> The only reason the SAASM receivers play with L2 is to demodulate the >> encrypted >> military

Re: [time-nuts] Newbie question about GPS

Hi Mattias, Then if you lock and control the 48MHz. You can also control the 1PPS edge to the accuracy of the computed time... add 1s drift and lock uncertainty. Read the beginning of the Tbolt manual. The Tbolt lets it’s locked 10MHz tick the whole receiver. /Björn Sent from my iPhone

Re: [time-nuts] Any (relatively) cheap TSIP GPS receivers without WNRO out there?

the way up to 1024wk (translated into seconds) to compensate for the wnro with your current receiver? # Set packet delay fudge 127.127.29.0 time1 0.020 - Björn Sent from my iPhone > On 12 Jan 2020, at 04:55, Skip Withrow wrote: > > I have an NTP server that uses a Trimble GPS

Re: [time-nuts] tracking position & orientation

No... NRCAN is one of the few that do not require both L1 and L2 observables. It also accepts only L1. /Björn Sent from my iPhone > On 23 Nov 2019, at 08:22, Poul-Henning Kamp wrote: > > > In message > , > Mark Sims writes: > >> NRCAN / csrs-ppp wil

Re: [time-nuts] Difference in antennas

You can get the data from The manufacturer or from some calibration database like NOAA https://www.ngs.noaa.gov/ANTCAL/# Or geo++ Or the list of antennas built into the post processing software. /Björn Sent from my iPhone > On 22 Nov 2019, at 19:02, Bill Dailey, MD, MSEng, MSMI >

Re: [time-nuts] Difference in antennas

The N for North is because the phase center offsets are not symmetrical. With a convention to orient the antennas the same way the offset could be corrected. /Björn Sent from my iPhone > On 22 Nov 2019, at 17:07, Bill Dailey wrote: > > I would like to tag on to this. I have a large

Re: [time-nuts] GPS Antennas

://kb.unavco.org/kb/article/unavco-resources-radomes-520.html /Björn Sent from my iPhone > On 7 Sep 2019, at 02:54, Bob kb8tq wrote: > > Hi > > Based on the papers I have seen, there is no “magic” shape that can be > ignored. > Part of the issue is that the cover is going to

Re: [time-nuts] GPS Antennas

Run the plastic in a microwave oven, with a glass of water. Don’t use it if the plastic gets warm. /Björn Sent from my iPhone > On 6 Sep 2019, at 21:45, David G. McGaw wrote: > > Also, as I have found, some plastics don't just delay but actually > absorb the signal. >

Re: [time-nuts] Galleleo status ??

Hi David, It is up an running again in Initial Services. https://www.gsc-europa.eu/system-status/Constellation-Information https://www.gsc-europa.eu/notice-advisory-to-galileo-users-nagu-2019027 /Björn Sent from my iPhone > On 22 Jul 2019, at 14:06, David Slipper wr

Re: [time-nuts] Galileo service currently degraded

InsideGNSS is responding really slow (only from Sweden?) My phone browsers gave up. My computer Mozilla finally got it. /Björn > On 14 Jul 2019, at 08:24, Leif Johansson wrote: > > That site seems to be down now > > Skickat från min iPhone > >> 14 juli 2019 kl. 00:

Re: [time-nuts] Galileo service currently degraded

over 90 hours. Can Galileo absorb this within the service level stated in Initial Service documents? https://www.gsc-europa.eu/system/files/documents/Galileo-OS-SDD.pdf (Page 26) Availability of OS UTC service - >87% over 30days. Equals outage of 3.9days (93.6

Re: [time-nuts] 60Khz received on Wide-band WebSDR

Would likely be the UK MSF signal. /Björn Sent from my iPhone > On 6 Jul 2019, at 14:39, D. Resor wrote: > > From another list I was directed to this link for those who do not have a > shortwave radio. > > http://websdr.ewi.utwente.nl:8901/ > > I entered the f

Re: [time-nuts] Truetime XLi sat signal levels (dBW to dBc/SNR conversion question)

Hi Mark & David, Perhaps this article is useful for the discussion. https://insidegnss.com/measuring-gnss-signal-strength/ /Björn Sent from my iPhone ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo

Re: [time-nuts] True position unlocking

receivers - mostly older - have a narrow gap where they perform optimally. There should be information in the receiver documentation somewhere. Then you can check with adding antenna gain - cable attenuation - splitter attenuation + any amplifiers (maybe within the splitter)

Re: [time-nuts] NavSymm Proteus Rollover Issue

me on the front panel... If you control the programming of the Arduino you can add 1024 weeks to the year/date and you should have a proper front panel display again. /Björn ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscri

Re: [time-nuts] Garmin GPS12XL V3.51

If you ignore date/year, everything else should be just as before. — Björn Sent from my iPhone > On 6 Apr 2019, at 05:40, Joe Leikhim wrote: > > Just checked my wonderful Garmin GPS12XL tonight. before midnight UTC I > checked navigation and UTC time and all was well. I di

Re: [time-nuts] GPS week rollover

umber of their cars are affected. Thats a bit strange considering the timeframes involved. Would have imagined that the self driving company bought units within say the last five years... why would the GPS vendor sell receivers that will fail for this reason so soon after purchase? /Björn ___

Re: [time-nuts] Calculating sidereal time

Hi Brooke, SV position in circular orbit repeats at 12h sidereal, but ground relative az/el repeats at 24h sidereal. This is because of the earth 24h rotation rate. After 12h your earth position will be 180deg away from (inertil) start position. — Björn Sent from my iPhone > On 21

Re: [time-nuts] WWV/WWVB in NTP surveys

And there seems to be options for wwvb reception also in 1u 19” format. https://www.meinbergglobal.com/english/products/rack-mount-1u-ntp-server.htm /Björn Sent from my iPhone > On 2 Sep 2018, at 15:48, Tim Shoppa wrote: > > Some stats in historic NTP surveys show that WWV and WWVB based refcloc

Re: [time-nuts] 1PPS for the beginner

20us (+50%-20%) - 16us to 30us is indeed very wide. The boss signing the document has dual Master of Science degrees... there were certainly engineers contributing to the document. Are there any better standards around? /Björn ___ time-nuts mailing

Re: [time-nuts] 1PPS for the beginner

Hi Bernd, One reference to 20us 1PPS pulse length is the ICD-GPS-060, see figure 3-2, page 3-3 (pdf page 19) https://www.navcen.uscg.gov/pdf/gps/ICD-GPS-060B.pdf Group - Are there other standard documents defining duty-cycle, voltage levels, rise times etc? MfG Björn > On 14 Aug 2