Re: [time-nuts] more ADEV tools
Tom, Thank you for posting this. Regards, John Westmoreland On Mar 20, 2014 3:16 PM, "Tom Van Baak" wrote: > I wrote two new ADEV command line tools that some of you may be interested > in. > > adev4 calculates adev for a linear range, from tau to tau step tau. > adev5 calculates adev for a logarithmic range, from log(tau) to > log(tau) step log(tau). > > The both calculate ADEV, MDEV, HDEV, or TDEV. > For large data files, performance is ten or a hundred times faster than > other adev tools. > > Grab adev4.c adev5.c (windows: adev4.exe adev5.exe) under > www.LeapSecond.com/tools/ > In a couple of days I'll post a note which will explain why I needed these > tools. > > /tvb > ___ > 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 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] Specs for Bliley NV47M1008?
I found a Bliley 10MHz OCXO model NV47M1008 Anyone here know about these? They seem to be available for about $11.00 or so. I looked around on the web and found specs for units that are "kind of like" this but not this exact model. You can see one at eBay #171274003103 Thanks, Chris Albertson Redondo Beach, California ___ 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.
Re: [time-nuts] Aircraft ping timing
I just red somewhere that the last "ping" was the only one recorded by Inmarsat system, Pings up to that point were presumed to occur due to known reporting intervals. So there is no "track". The Inmarsat data is a red herring. The plane could have ditched into the water 85 minutes after the "incident:, at location near last radar contact and floated with Inmarsat operating on service battery for hours. The ELT's used in this aircraft have been implicated in two fires due to shorted lithium battery wires. There was an AD/Recall issued. No reports whatsoever about the ELT being activated, so if it burned.. Good only for 48 hours or so anyway if looking in the wrong place. Maybe there is a market for Orbcomm asset tracking transmitters mounted way up in an inaccessible location of the tail with own back up battery supply. -- Joe Leikhim Leikhim and Associates Communications Consultants Oviedo, Florida jleik...@leikhim.com 407-982-0446 WWW.LEIKHIM.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.
[time-nuts] more ADEV tools
I wrote two new ADEV command line tools that some of you may be interested in. adev4 calculates adev for a linear range, from tau to tau step tau. adev5 calculates adev for a logarithmic range, from log(tau) to log(tau) step log(tau). The both calculate ADEV, MDEV, HDEV, or TDEV. For large data files, performance is ten or a hundred times faster than other adev tools. Grab adev4.c adev5.c (windows: adev4.exe adev5.exe) under www.LeapSecond.com/tools/ In a couple of days I'll post a note which will explain why I needed these tools. /tvb ___ 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.
Re: [time-nuts] Aircraft ping timing
In message , "Stanley" writes: >Missing plane this ping was not lost why would others be lost ? This ping >was retrieved long after (days) it was received why would it be the only one ? The point is that they might have been able to do more precise pings in real-time, but now that it's on file in lower resolution, that's too late. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence. ___ 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.
Re: [time-nuts] Aircraft ping timing
Missing plane this ping was not lost why would others be lost ? This ping was retrieved long after (days) it was received why would it be the only one ? Stanley - Original Message - From: "Jim Lux" To: Sent: Thursday, March 20, 2014 11:05 AM Subject: Re: [time-nuts] Aircraft ping timing On 3/20/14 8:53 AM, Poul-Henning Kamp wrote: In message <40280C39FE7D43C79313A1755BCAF58D@StanleyPC>, "Stanley" writes: Would think they have many other aircraft with known position stationary or moving with location known to help improve the estimate. They might have been able to do that while the plane responded, but now that the plane is silent it is too late. It's also not something they really do as part of regular operations. It's probably more like a long term performance monitoring thing to make sure the satellite isn't degrading, or mis pointed. ___ 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 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.
Re: [time-nuts] Aircraft ping timing
On 3/20/14 8:53 AM, Poul-Henning Kamp wrote: In message <40280C39FE7D43C79313A1755BCAF58D@StanleyPC>, "Stanley" writes: Would think they have many other aircraft with known position stationary or moving with location known to help improve the estimate. They might have been able to do that while the plane responded, but now that the plane is silent it is too late. It's also not something they really do as part of regular operations. It's probably more like a long term performance monitoring thing to make sure the satellite isn't degrading, or mis pointed. ___ 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.
Re: [time-nuts] Aircraft ping timing
In message <532ae780.4020...@earthlink.net>, Jim Lux writes: >On 3/20/14 12:07 AM, Poul-Henning Kamp wrote: >Is there a document that describes the system somewhere? I've seen >various descriptions of what's going on. Do they use timing or amplitude >measurements? It is a timing measurement and it's not really designed to be precise. I belive the basic timing accuracy just below +/- 1msec. As the signal flies, that is +/- 300km. Projecting that onto the spherical planet, with an antenna angle around 40 degrees smears it out by a factor of roughly 1.5 and that's where the 740 km comes from. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence. ___ 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.
Re: [time-nuts] Aircraft ping timing
In message <40280C39FE7D43C79313A1755BCAF58D@StanleyPC>, "Stanley" writes: >Would think they have many other aircraft with known position stationary or >moving with location known to help improve the estimate. They might have been able to do that while the plane responded, but now that the plane is silent it is too late. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence. ___ 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.
Re: [time-nuts] Aircraft ping timing
Would think they have many other aircraft with known position stationary or moving with location known to help improve the estimate. Stanley - Original Message - From: "Jim Lux" To: Sent: Thursday, March 20, 2014 8:05 AM Subject: Re: [time-nuts] Aircraft ping timing On 3/20/14 12:07 AM, Poul-Henning Kamp wrote: In message <279331507.5734621395275538874.JavaMail.actor@webmail5>, "iovane@inw ind.it" writes: My question was on what would be the expected accuracy of the circle's radius. Projected onto the surface of the earth, the uncertainty leaves a band approx 740km wide. Is there a document that describes the system somewhere? I've seen various descriptions of what's going on. Do they use timing or amplitude measurements? ___ 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 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.
Re: [time-nuts] Aircraft ping timing
On 3/20/14 12:07 AM, Poul-Henning Kamp wrote: In message <279331507.5734621395275538874.JavaMail.actor@webmail5>, "iovane@inw ind.it" writes: My question was on what would be the expected accuracy of the circle's radius. Projected onto the surface of the earth, the uncertainty leaves a band approx 740km wide. Is there a document that describes the system somewhere? I've seen various descriptions of what's going on. Do they use timing or amplitude measurements? ___ 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.
Re: [time-nuts] Aircraft ping timing
In message <279331507.5734621395275538874.JavaMail.actor@webmail5>, "iovane@inw ind.it" writes: >My question was on what would be the expected accuracy of the circle's radius. Projected onto the surface of the earth, the uncertainty leaves a band approx 740km wide. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence. ___ 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.
