Re: [time-nuts] Something odd - ionosphere?

geomagnetic storms on Jan. 8th asbright auroras <http://spaceweathergallery.com/aurora_gallery.htm>flicker around the Arctic Circle. http://spaceweather.com/ for further details cheers, Graham ve3gtc On 2017-01-08 20:48, Bob Stewart wrote: > This morning at about 0400 CST and again at

[time-nuts] 1PPS users?

One thing I've never really understood is who actually uses the high-quality 1PPS output from a GPSDO.  I have spent a lot of time, effort, and money on developing my GPSDO without a whole of thought to the user base.  It was just a quest for the best result I could obtain with a particular

Re: [time-nuts] 1PPS users?

:56 PM Subject: Re: [time-nuts] 1PPS users? On 12/18/16 3:16 PM, Bob Stewart wrote: > One thing I've never really understood is who actually uses the high-quality > 1PPS output from a GPSDO.  I have spent a lot of time, effort, and money on > developing my GPSDO without a w

Re: [time-nuts] 1PPS users?

/groups/GFS-GPSDOs/info From: Scott Stobbe <scott.j.sto...@gmail.com> To: Bob Stewart <b...@evoria.net>; Discussion of precise time and frequency measurement <time-nuts@febo.com> Sent: Sunday, December 18, 2016 8:22 PM Subject: Re: [time-nuts] 1PPS users? Part of the

Re: [time-nuts] u-blox timing modules

Hi John, Could you tell me why one would use choose an LEA-M8F over an LEA-M8T? Bob - AE6RV  - AE6RV.com GFS GPSDO list: groups.yahoo.com/neo/groups/GFS-GPSDOs/info From: John Haine To:

Re: [time-nuts] Timelab, GPIB-USB-B in a VM

I don't know how they're done in VMWare, but in VirtualBox, you have to setup the USB configuration for the VM before you start it.  You just click the machine, settings, then USB, then add a device, then select from what's available.  Which means you have to have it plugged in and enumerated

Re: [time-nuts] ADEV query Timelab and TICC

These look a lot like the 25ns pops I was getting when I first started generating the 1PPS output from the PIC.  In my case, the PIC uses a PLL to multiply the external clock from 10MHz to 80MHz, which is then  divided to 40MHz and used as an instruction clock.  This gave an occasional early or

Re: [time-nuts] time-nuts equipment verification from scratch (was: WTB: GPSDO)

I would say that the price for a home-built time-nuts quality GPSDO is going to be significantly greater than $200.  Yes, if you are making them for sale, eventually the unit cost will get down there.  But to build one single good GPSDO, you're going to throw away a lot of prototypes on the way

[time-nuts] Timelab file wanted

have one, could you send me a copy off-list? thanks, Bob Stewart ---   bob at evoria dot net   - AE6RV.com GFS GPSDO list: groups.yahoo.com/neo/groups/GFS-GPSDOs/info ___ time-nuts mailing

[time-nuts] Timelab file needed

Does anyone have a timelab file for a KS-24361?  My KS has a much worse 1s ADEV (and on down the line) than I would have expected, and I'd like to see what others are getting. Bob AE6RV.com GFS GPSDO list:

[time-nuts] Three-cornered hat on timelab?

It was mentioned that Timelab can do a three-cornered hat.  I can't find it.  Is this something that can only be done with multiple Timepods connected, or is there an option that I'm missing?  Or is there some other tool that needs to be used?  For the record, I want to create the 3c-hat from

Re: [time-nuts] Three-cornered hat on timelab?

be great! Bob  From: Bob kb8tq <kb...@n1k.org> To: Bob Stewart <b...@evoria.net>; Discussion of precise time and frequency measurement <time-nuts@febo.com> Cc: John Miles <j...@miles.io> Sent: Thursday, April 13, 2017 7:19 PM Subject: Re: [time-nuts] Three-cornere

Re: [time-nuts] Three-cornered hat on timelab?

and Bruce and others have spoken about.  This bothers me a lot.  Could it be my location here in Houston?  Could it be the Ublox LEA-6T compared to the much older Motorola in the KS? Bob  From: Bob kb8tq <kb...@n1k.org> To: Bob Stewart <b...@evoria.net> Cc: Discussion of

Re: [time-nuts] Three-cornered hat on timelab?

e consistent with the source labels you apply.  I would use frequency-count mode to simplify things, at least at first.  This is already a very challenging measurement for all the reasons mentioned. -- john, KE5FX Miles Design LLC From: Bob Stewart [mailto:b...@evoria.net] Sent: Thursday, Ap

Re: [time-nuts] Three-cornered hat on timelab?

Hi John, Thanks!  With lesser equipment, such as the 5370A, would longer runs be better?  I used a set of 1 hr runs and the result wasn't quite what I had expected.  However, it may be that I had mislabeled the files, and thus got the sources confused.  Of course, it may be that the ionospheric

Re: [time-nuts] Three-cornered hat on timelab?

Hi Magnus, Today I started a long run against my PRS-45A.  Maybe this time I won't have a power outage.  I'll see what it tells me in a few days. Bob  From: Magnus Danielson <mag...@rubidium.dyndns.org> To: Bob Stewart <b...@evoria.net>; Discussion of precise time a

[time-nuts] Cs standard stability

I hooked up my PRS-45A yesterday, just to do some ADEV comparisons with my GPSDO.  Unfortunately, the GPSDO seems to be better by almost two points at all tau as measured on my HP 5370A and plotted by Timelab.  So, can I infer from that that the OCXO in the PRS has a problem, or could it be

Re: [time-nuts] Cs standard stability

From: Bruce Griffiths <bruce.griffi...@xtra.co.nz> To: Bob Stewart <b...@evoria.net>; Discussion of precise time and frequency measurement <time-nuts@febo.com> Sent: Saturday, March 4, 2017 4:28 PM Subject: Re: [time-nuts] Cs standard stability Bob Your reasoning appe

Re: [time-nuts] Cs standard stability

anything more than that.  Correct? Bob From: Bruce Griffiths <bruce.griffi...@xtra.co.nz> To: Bob Stewart <b...@evoria.net>; Discussion of precise time and frequency measurement <time-nuts@febo.com> Sent: Saturday, March 4, 2017 3:44 AM Subject: Re: [time-nuts] Cs

Re: [time-nuts] Cs standard stability

tracks what is to be expected when run on a good 5370, isn't it? Bob From: Bruce Griffiths <bruce.griffi...@xtra.co.nz> To: Bob Stewart <b...@evoria.net>; Discussion of precise time and frequency measurement <time-nuts@febo.com> Sent: Saturday, March 4, 2017 5:22 PM

Re: [time-nuts] Cs standard stability

.nz> To: Bob Stewart <b...@evoria.net>; Discussion of precise time and frequency measurement <time-nuts@febo.com> Sent: Saturday, March 4, 2017 6:03 PM Subject: Re: [time-nuts] Cs standard stability BobWe are certainly not off track.The phase noise of the GPSDO affects the trig

Re: [time-nuts] Cs standard stability

<bruce.griffi...@xtra.co.nz> To: Bob Stewart <b...@evoria.net>; Discussion of precise time and frequency measurement <time-nuts@febo.com> Sent: Saturday, March 4, 2017 7:14 PM Subject: Re: [time-nuts] Cs standard stability BobYou should to use the same measurement bandwidth w

Re: [time-nuts] Three-cornered hat on timelab?

Hi Bob, OK, thanks.  I've kicked off a 7 day run of a GFS against the PRS-45A.  That should be long enough to separate out the GFS from the PRS' drift direction from the ionosphere. Bob  From: Bob kb8tq <kb...@n1k.org> To: Bob Stewart <b...@evoria.net> Cc: Discussion of

Re: [time-nuts] Three-cornered hat on timelab?

ges/sidereal/14years.htm http://leapsecond.com/pages/sidereal/sv.htm http://leapsecond.com/pages/gps-orbit/ - Original Message ----- From: "Bob Stewart" <b...@evoria.net> To: "Bob kb8tq" <kb...@n1k.org>; "Discussion of Precise Time and Frequency Measure

Re: [time-nuts] Three-cornered hat on timelab?

robably increasing as the value gets lower. Not trying to crucify you with your own words, Bob.  Like many of the time-nuts who don't post, I'm just trying to make some sense of this in terms I can deal with. Bob From: Bob kb8tq <kb...@n1k.org> To: Bob Stewart <b...@evoria.net&g

Re: [time-nuts] Three-cornered hat on timelab?

to happen? Bob - AE6RV.com GFS GPSDO list: groups.yahoo.com/neo/groups/GFS-GPSDOs/info From: Magnus Danielson <mag...@rubidium.dyndns.org> To: Bob Stewart <b...@evoria.net>; Discussion of precise time and frequency

Re: [time-nuts] TAPR Oncore M12+ kit

Hi Bob, It may be because the process of cutting the boards apart is not part of the board milling process.  Yes, cutting holes in boards for through-hole parts is part of the business - round holes.  The fab house for OSHPark won't make oval holes.  They won't overlap two holes, either, nor

Re: [time-nuts] Three-cornered hat on timelab?

From: Bob kb8tq <kb...@n1k.org> To: Bob Stewart <b...@evoria.net> Cc: Discussion of precise time and frequency measurement <time-nuts@febo.com> Sent: Thursday, April 27, 2017 4:17 PM Subject: Re: [time-nuts] Three-cornered hat on timelab? Hi Dig into spac

Re: [time-nuts] Three-cornered hat on timelab?

From: jimlux <jim...@earthlink.net> To: time-nuts@febo.com Sent: Thursday, April 27, 2017 5:03 PM Subject: Re: [time-nuts] Three-cornered hat on timelab? On 4/27/17 12:10 PM, Bob Stewart wrote: > Hi Bob, > said: > "You have roughly 25 ns p-p in the data you show.&quo

Re: [time-nuts] Three-cornered hat on timelab?

was good.  Maybe in another 5 years the sunspots will be back up and I can see the comparison to now. Bob From: Magnus Danielson <mag...@rubidium.se> To: Bob Stewart <b...@evoria.net>; Discussion of Precise Time and Frequency Measurement <time-nuts@febo.com> Cc: mag...

[time-nuts] 5370 problems, was Re: Three-cornered hat on timelab?

ay. Just use that OEM board, and your TIC, and your PRS-45A. Collect sawtooth data too. You should get down to 2 or 3 ns RMS. /tvb ----- Original Message - From: "Bob Stewart" <b...@evoria.net> To: "Discussion of Precise Time and Frequency Measurement" <time-nuts

Re: [time-nuts] Three-cornered hat on timelab?

From: Bob kb8tq <kb...@n1k.org> To: Bob Stewart <b...@evoria.net> Cc: Discussion of precise time and frequency measurement <time-nuts@febo.com> Sent: Wednesday, May 3, 2017 10:48 AM Subject: Re: [time-nuts] Three-cornered hat on timelab? Hi Dump it to a csv file and do

Re: [time-nuts] Three-cornered hat on timelab?

-GPSDOs/info From: Bob kb8tq <kb...@n1k.org> To: Bob Stewart <b...@evoria.net> Cc: Discussion of precise time and frequency measurement <time-nuts@febo.com> Sent: Wednesday, May 3, 2017 11:11 AM Subject: Re: [time-nuts] Three-cornered hat on timelab? Hi If you convert

Re: [time-nuts] Three-cornered hat on timelab?

Hi Bob, What I should have asked is this: "how do I get that from a Timelab dataset?"    Bob From: Bob kb8tq <kb...@n1k.org> To: Bob Stewart <b...@evoria.net>; Discussion of precise time and frequency measurement <time-nuts@febo.com> Cc: Tom Van Baak

Re: [time-nuts] Three-cornered hat on timelab?

you're using.  I've had good luck with the Trimble 34310-Ts that are about $20 each depending on the vendor. Bob  From: Jim Harman <j99har...@gmail.com> To: Bob Stewart <b...@evoria.net>; Discussion of precise time and frequency measurement <time-nuts@febo.com> Sent:

Re: [time-nuts] Three-cornered hat on timelab?

't require buying expensive gear? My first suggestion is for you run a standalone GPS timing receiver like a M12+T or ublox-6. Put all your GPSDO away. Just use that OEM board, and your TIC, and your PRS-45A. Collect sawtooth data too. You should get down to 2 or 3 ns RMS. /tvb ----- Original

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