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Charles Curry

Tue, Jan 26, 2016 4:43 PM

Tom

This is what I sent.... unchecked Rich Text (HTML) now

Has anyone noticed GPS problems today?

It looks like PRN32 / SVN 23 went faulty yesterday and was taken out of service last night at 22:00 ZULU

http://www.navcen.uscg.gov/?Do=gpsShowNanu&num=2016008

We've seen issues with a number of timing receivers so far.

Best Regards,

Charles

Prof. Charles W T Curry BEng, CEng, MITP, FIET
Managing Director
Chronos Technology Ltd

http://www.chronos.co.uk/index.php/en/company-info/whos-who#CC
http://uk.linkedin.com/pub/charles-curry/0/b2/445

Switchboard: +44 (0)1594 862 200
Direct: +44 (0)1594 862 201
Mobile: +44 (0)7786 336 001

www.chronos.co.uk
www.gps-world.biz
www.taviga.co.uk

Skype Laptop: chascurry

This email has been sent to you by Chronos Technology Limited; Registered in England and Wales Number: 2056049; VAT Number: GB 791312044; Registered Office: Stowfield House, Upper Stowfield, Lydbrook, Gloucestershire, GL17 9PD.
All data and information contained in this e-mail is in confidence and is the copyright of Chronos Technology Limited and/or its Suppliers. No information contained in this e-mail may be released, republished or incorporated into any other work without the prior written consent of the discloser and/or copyright owner.

----------------------- Original Message -----------------------

From: "Tom Van Baak" tvb@LeapSecond.com
To: "Charles Curry" charles.curry@chronos.co.uk
Cc: "John Ackerman" time-nuts@febo.com
Date: Tue, 26 Jan 2016 08:11:21 -0800
Subject: Re: GPS PRN 32

Hi Charles,

Your posting just now is completely blank (see below).
Was this an accident? Or perhaps your email client is configured for HTML-only instead of TEXT or TEXT+HTML.
Let me know if I can help.

Thanks,
/tvb

----- Original Message -----
From: "Charles Curry" charles.curry@chronos.co.uk
To: "John Ackerman" time-nuts@febo.com
Sent: Tuesday, January 26, 2016 7:26 AM
Subject: GPS PRN 32

This email has been scanned by the Symantec Email Security.cloud service.
For more information please visit http://www.symanteccloud.com

Tom This is what I sent.... unchecked Rich Text (HTML) now Has anyone noticed GPS problems today? It looks like PRN32 / SVN 23 went faulty yesterday and was taken out of service last night at 22:00 ZULU http://www.navcen.uscg.gov/?Do=gpsShowNanu&num=2016008 We've seen issues with a number of timing receivers so far. Best Regards, Charles ___________________________________________ Prof. Charles W T Curry BEng, CEng, MITP, FIET Managing Director Chronos Technology Ltd http://www.chronos.co.uk/index.php/en/company-info/whos-who#CC http://uk.linkedin.com/pub/charles-curry/0/b2/445 Switchboard: +44 (0)1594 862 200 Direct: +44 (0)1594 862 201 Mobile: +44 (0)7786 336 001 www.chronos.co.uk www.gps-world.biz www.taviga.co.uk Skype Laptop: chascurry This email has been sent to you by Chronos Technology Limited; Registered in England and Wales Number: 2056049; VAT Number: GB 791312044; Registered Office: Stowfield House, Upper Stowfield, Lydbrook, Gloucestershire, GL17 9PD. All data and information contained in this e-mail is in confidence and is the copyright of Chronos Technology Limited and/or its Suppliers. No information contained in this e-mail may be released, republished or incorporated into any other work without the prior written consent of the discloser and/or copyright owner. ----------------------- Original Message ----------------------- From: "Tom Van Baak" <tvb@LeapSecond.com> To: "Charles Curry" <charles.curry@chronos.co.uk> Cc: "John Ackerman" <time-nuts@febo.com> Date: Tue, 26 Jan 2016 08:11:21 -0800 Subject: Re: GPS PRN 32 Hi Charles, Your posting just now is completely blank (see below). Was this an accident? Or perhaps your email client is configured for HTML-only instead of TEXT or TEXT+HTML. Let me know if I can help. Thanks, /tvb ----- Original Message ----- From: "Charles Curry" <charles.curry@chronos.co.uk> To: "John Ackerman" <time-nuts@febo.com> Sent: Tuesday, January 26, 2016 7:26 AM Subject: GPS PRN 32 > ______________________________________________________________________ This email has been scanned by the Symantec Email Security.cloud service. For more information please visit http://www.symanteccloud.com ______________________________________________________________________ ______________________________________________________________________ This email has been scanned by the Symantec Email Security.cloud service. For more information please visit http://www.symanteccloud.com ______________________________________________________________________

MD

Magnus Danielson

Tue, Jan 26, 2016 8:35 PM

Hi,

It seems that several SVNs (PRN 2, 6, 7, 9 and 23) got feed bad data.
This is not the first instance, it seems that single SVNs have had bad
data the last couple of days.

When our 4 GPS receivers at work got "hit" at midnight, it got our
attention. Interestingly enough they did not experience issues at the
same time, it just started about the same time.

Several of my customers also reported issues. Turns out that more people
seen this.

It will be interesting when a proper analysis comes on this.

Cheers,
Magnus

On 01/26/2016 05:43 PM, Charles Curry wrote:

Tom

This is what I sent.... unchecked Rich Text (HTML) now

Has anyone noticed GPS problems today?

It looks like PRN32 / SVN 23 went faulty yesterday and was taken out of service last night at 22:00 ZULU

http://www.navcen.uscg.gov/?Do=gpsShowNanu&num=2016008

We've seen issues with a number of timing receivers so far.

Best Regards,

Charles

Prof. Charles W T Curry BEng, CEng, MITP, FIET
Managing Director
Chronos Technology Ltd

http://www.chronos.co.uk/index.php/en/company-info/whos-who#CC
http://uk.linkedin.com/pub/charles-curry/0/b2/445

Switchboard: +44 (0)1594 862 200
Direct: +44 (0)1594 862 201
Mobile: +44 (0)7786 336 001

www.chronos.co.uk
www.gps-world.biz
www.taviga.co.uk

Skype Laptop: chascurry

This email has been sent to you by Chronos Technology Limited; Registered in England and Wales Number: 2056049; VAT Number: GB 791312044; Registered Office: Stowfield House, Upper Stowfield, Lydbrook, Gloucestershire, GL17 9PD.
All data and information contained in this e-mail is in confidence and is the copyright of Chronos Technology Limited and/or its Suppliers. No information contained in this e-mail may be released, republished or incorporated into any other work without the prior written consent of the discloser and/or copyright owner.

----------------------- Original Message -----------------------

From: "Tom Van Baak" tvb@LeapSecond.com
To: "Charles Curry" charles.curry@chronos.co.uk
Cc: "John Ackerman" time-nuts@febo.com
Date: Tue, 26 Jan 2016 08:11:21 -0800
Subject: Re: GPS PRN 32

Hi Charles,

Your posting just now is completely blank (see below).
Was this an accident? Or perhaps your email client is configured for HTML-only instead of TEXT or TEXT+HTML.
Let me know if I can help.

Thanks,
/tvb

----- Original Message -----
From: "Charles Curry" charles.curry@chronos.co.uk
To: "John Ackerman" time-nuts@febo.com
Sent: Tuesday, January 26, 2016 7:26 AM
Subject: GPS PRN 32

This email has been scanned by the Symantec Email Security.cloud service.
For more information please visit http://www.symanteccloud.com

time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

Hi, It seems that several SVNs (PRN 2, 6, 7, 9 and 23) got feed bad data. This is not the first instance, it seems that single SVNs have had bad data the last couple of days. When our 4 GPS receivers at work got "hit" at midnight, it got our attention. Interestingly enough they did not experience issues at the same time, it just started about the same time. Several of my customers also reported issues. Turns out that more people seen this. It will be interesting when a proper analysis comes on this. Cheers, Magnus On 01/26/2016 05:43 PM, Charles Curry wrote: > Tom > > This is what I sent.... unchecked Rich Text (HTML) now > > Has anyone noticed GPS problems today? > > It looks like PRN32 / SVN 23 went faulty yesterday and was taken out of service last night at 22:00 ZULU > > http://www.navcen.uscg.gov/?Do=gpsShowNanu&num=2016008 > > We've seen issues with a number of timing receivers so far. > > Best Regards, > > Charles > ___________________________________________ > Prof. Charles W T Curry BEng, CEng, MITP, FIET > Managing Director > Chronos Technology Ltd > > > http://www.chronos.co.uk/index.php/en/company-info/whos-who#CC > http://uk.linkedin.com/pub/charles-curry/0/b2/445 > > Switchboard: +44 (0)1594 862 200 > Direct: +44 (0)1594 862 201 > Mobile: +44 (0)7786 336 001 > > www.chronos.co.uk > www.gps-world.biz > www.taviga.co.uk > > > Skype Laptop: chascurry > > > This email has been sent to you by Chronos Technology Limited; Registered in England and Wales Number: 2056049; VAT Number: GB 791312044; Registered Office: Stowfield House, Upper Stowfield, Lydbrook, Gloucestershire, GL17 9PD. > All data and information contained in this e-mail is in confidence and is the copyright of Chronos Technology Limited and/or its Suppliers. No information contained in this e-mail may be released, republished or incorporated into any other work without the prior written consent of the discloser and/or copyright owner. > > ----------------------- Original Message ----------------------- > > From: "Tom Van Baak" <tvb@LeapSecond.com> > To: "Charles Curry" <charles.curry@chronos.co.uk> > Cc: "John Ackerman" <time-nuts@febo.com> > Date: Tue, 26 Jan 2016 08:11:21 -0800 > Subject: Re: GPS PRN 32 > > Hi Charles, > > Your posting just now is completely blank (see below). > Was this an accident? Or perhaps your email client is configured for HTML-only instead of TEXT or TEXT+HTML. > Let me know if I can help. > > Thanks, > /tvb > > ----- Original Message ----- > From: "Charles Curry" <charles.curry@chronos.co.uk> > To: "John Ackerman" <time-nuts@febo.com> > Sent: Tuesday, January 26, 2016 7:26 AM > Subject: GPS PRN 32 > > >> > > ______________________________________________________________________ > This email has been scanned by the Symantec Email Security.cloud service. > For more information please visit http://www.symanteccloud.com > ______________________________________________________________________ > > > > > ______________________________________________________________________ > This email has been scanned by the Symantec Email Security.cloud service. > For more information please visit http://www.symanteccloud.com > ______________________________________________________________________ > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. >

CS

Charles Steinmetz

Wed, Jan 27, 2016 12:22 AM

Magnus wrote:

Interestingly enough they did not experience issues at the same
time, it just started about the same time.

Presumably, each rx would be affected when it added one or more
corrupted satellites to the constellation it was using for its
solution. Since each rx makes those decisions independently, one
would not expect them to exhibit problems in exact synchrony.

Best regards,

Charles

Magnus wrote: >Interestingly enough they did not experience issues at the same >time, it just started about the same time. Presumably, each rx would be affected when it added one or more corrupted satellites to the constellation it was using for its solution. Since each rx makes those decisions independently, one would not expect them to exhibit problems in exact synchrony. Best regards, Charles

T

timenut (at) metachaos.net

Wed, Jan 27, 2016 3:20 AM

Ha!

I finally answered one of my questions that has been bugging me!

I was taking dBm as the definition of voltage - which it is, but only
round-about. The hidden variable is the assumed impedance of 50 ohms where 1mW
is the zero point for power. That is also why I wasn't getting consistent
answers - different application areas I am interest in assumed different
values for the impedance and so my calculations were all over the place. I
found a reference in the PRS10 reference that tied it all together for me.

Mike

Ha! I finally answered one of my questions that has been bugging me! I was taking dBm as the definition of voltage - which it is, but only round-about. The hidden variable is the assumed impedance of 50 ohms where 1mW is the zero point for power. That is also why I wasn't getting consistent answers - different application areas I am interest in assumed different values for the impedance and so my calculations were all over the place. I found a reference in the PRS10 reference that tied it all together for me. Mike

JL

J. L. Trantham

Wed, Jan 27, 2016 5:16 AM

I don't know if this related or not but my Z3816A (with Symmetricom SatStat) is displaying the proper time but a date of 12 Sep 2035, tracking PRN 1, 7, 17, 19, 28 and 30.

My TBolt (with Lady Heather) is displaying proper time and date, tracking 1, 7, 11, 17, 19, 28 and 30

I 'cycled' power on the Z3816A but it came up with the same erroneous date again. TFOM is 3 and FFOM is 0.

I'm going to open the unit, remove the 'back up' battery and let it 'rediscover' itself and see what happens. I tried to set the date via command but no joy.

Joe

-----Original Message-----
From: time-nuts [mailto:time-nuts-bounces@febo.com] On Behalf Of Charles Steinmetz
Sent: Tuesday, January 26, 2016 6:23 PM
To: Discussion of precise time and frequency measurement
Subject: [Bulk] Re: [time-nuts] GPS PRN 32

Magnus wrote:

Interestingly enough they did not experience issues at the same time,
it just started about the same time.

Presumably, each rx would be affected when it added one or more corrupted satellites to the constellation it was using for its solution. Since each rx makes those decisions independently, one would not expect them to exhibit problems in exact synchrony.

Best regards,

Charles

time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

I don't know if this related or not but my Z3816A (with Symmetricom SatStat) is displaying the proper time but a date of 12 Sep 2035, tracking PRN 1, 7, 17, 19, 28 and 30. My TBolt (with Lady Heather) is displaying proper time and date, tracking 1, 7, 11, 17, 19, 28 and 30 I 'cycled' power on the Z3816A but it came up with the same erroneous date again. TFOM is 3 and FFOM is 0. I'm going to open the unit, remove the 'back up' battery and let it 'rediscover' itself and see what happens. I tried to set the date via command but no joy. Joe -----Original Message----- From: time-nuts [mailto:time-nuts-bounces@febo.com] On Behalf Of Charles Steinmetz Sent: Tuesday, January 26, 2016 6:23 PM To: Discussion of precise time and frequency measurement Subject: [Bulk] Re: [time-nuts] GPS PRN 32 Magnus wrote: >Interestingly enough they did not experience issues at the same time, >it just started about the same time. Presumably, each rx would be affected when it added one or more corrupted satellites to the constellation it was using for its solution. Since each rx makes those decisions independently, one would not expect them to exhibit problems in exact synchrony. Best regards, Charles _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.

time-nuts@lists.febo.com

Re: [time-nuts] GPS PRN 32