Re: [time-nuts] NIST

pla...@gmail.com said: > Which satellites? Most are here: https://celestrak.com Tracking programs > are abundant. I was thinking of geo-sync, but if position info is widely available then I guess I should be interested in any satellites that provide good time. (maybe an are likely to

Re: [time-nuts] Effects of Simple GPS jamming on GPSDO's ?

On Fri, Aug 31, 2018 at 12:41 PM, Gerhard Hoffmann wrote: > > >> So you can test your hold over behavior with aluminum foil (or your hand) >> over your antenna >> >> OMG, I first read "with aluminium foil hat over your head" > Now, foil under the antenna on the other hand, big improvement!

Re: [time-nuts] Fwd: Re: law and regulation applying to time.. was Re: OOPS on my wwv legal post

On Fri, Aug 31, 2018 at 10:31 AM Dr. Götz Romahn wrote: > > For German regulations see here: > https://www.ptb.de/cms/en/ptb/fachabteilungen/abt4/fb-44/ag-442/dissemination-of-legal-time.html > Götz > CET is derived from UTC

Re: [time-nuts] News

Congratulations! Well done! On Thu, Aug 30, 2018 at 16:40 Magnus Danielson wrote: > Hi Bob, > > On 08/30/2018 10:33 PM, Bob kb8tq wrote: > > Hi > > > > Magnus … do you have some news you might want to share with the group? > > Oh, well, sure: > > Today I received a nice email from IEEE

Re: [time-nuts] Effects of Simple GPS jamming on GPSDO's ?

Hi Time is not (ultimately) determined by an atomic clock. It’s determined by astronomical observations that evaluate the rotation of the planet. Those observations are what drive things like leap seconds. In the event that a flare takes out 99% of all life on earth and every electrical

Re: [time-nuts] Effects of Simple GPS jamming on GPSDO's ?

That’s the scenario i’m most concerned with not war or terrorism but a natural event which has occurred before and will occur again. Rebooting technology will be a heck of a lot easier with a variety of precision time/frequency distribution methods. After a Carrington type event a working Cs

Re: [time-nuts] Effects of Simple GPS jamming on GPSDO's ?

I'm thinking about if/when "the big one hits" and takes out most or all of the GPS sats, cell phone systems, etc. Then the time required to reboot up to a reasonable level of technology might turn out to be limited by our ability to determine time and freq somewhat accurately. The better we can

Re: [time-nuts] Effects of Simple GPS jamming on GPSDO's ?

Hi I think we have a little bit of confusion here. WWVB is not going to help anybody navigate. It’s not going to help track people with ankle bracelets or trucks stopping at bars. Car thieves jamming Lojack still happens. Turn iWWVB on or off, this stuff still goes on. None of this is a

Re: [time-nuts] NIST

Thanks. > perigee height: 35772 km > apogee height:35800 km If I did the math right, that's 89 microseconds. -- These are my opinions. I hate spam. ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to

Re: [time-nuts] Effects of Simple GPS jamming on GPSDO's ?

Am 31.08.2018 um 19:39 schrieb jimlux: On 8/31/18 10:15 AM, Bob kb8tq wrote: Hi Having spent a lot of my life designing GPSDO’s it’s a “that depends” sort of thing. For a simple noise jammer, yes, they pretty much all will go into holdover. When the jammer goes away, they come out of

[time-nuts] NIST

A GPS receiver that supports SBAS, etc will tell you where the sats are. Some only report to 1 degree, others 0.1 to 0.01 degrees resolution. The beam with of a small dish at GPS freqs is not all that narrow. Using orbital elements or processing the GNSS ephemeris message will give you a

Re: [time-nuts] NIST

On 8/31/18 11:17 AM, Hal Murray wrote: att...@kinali.ch said: I have somewhere a paper (which i cannot find currently, sorry) that used a dish trained at one of the EGNOS satellites and used it as the only source for timing. IIRC the results were promising, but not spectacular. The problem

Re: [time-nuts] NIST

att...@kinali.ch said: > I have somewhere a paper (which i cannot find currently, sorry) that used a > dish trained at one of the EGNOS satellites and used it as the only source > for timing. IIRC the results were promising, but not spectacular. The problem > being that all the ionospheric and

Re: [time-nuts] Effects of Simple GPS jamming on GPSDO's ?

Hi Most of them are doing CW signal detection and notch filtering. There are a number of ways for “birdies” to show up in any environment, jamming or no jamming. Some of the details of who’s doing what and how well are under NDA. None of it is 100% effective, it’s just a way to get another 10,

Re: [time-nuts] NIST

On 8/31/18 10:31 AM, Brooke Clarke wrote: Hi Azelio: Thanks for the link. It's interesting that their setup (a Ku band satellite TV antenna and a standard GPS timing antenna) worked as well as it did with reversed polarity.  Does anyone know of a source of reverse polarity GPS antennas and a

Re: [time-nuts] Effects of Simple GPS jamming on GPSDO's ?

On 8/31/18 10:15 AM, Bob kb8tq wrote: Hi Having spent a lot of my life designing GPSDO’s it’s a “that depends” sort of thing. For a simple noise jammer, yes, they pretty much all will go into holdover. When the jammer goes away, they come out of holdover. There are a few older units that may

[time-nuts] Effects of Simple GPS jamming on GPSDO's ?

Several GPS receivers have a setting for enabling jamming detection and/or mitigation. The datasheets don't tend to talk about what it does. But, if the receiver supports it (Trimble and Venus devices), Lady Heather can configure it. ___ time-nuts

Re: [time-nuts] NIST

Hi Azelio: Thanks for the link. It's interesting that their setup (a Ku band satellite TV antenna and a standard GPS timing antenna) worked as well as it did with reversed polarity.  Does anyone know of a source of reverse polarity GPS antennas and a GPS timing receiver that also processes

Re: [time-nuts] WWV and legal issues

Hi Well if you have a magic piece of code that will do the trick, why don’t you share it with the rest of us? In …. errr …. 50+ years of looking at the problem, nobody else seems to have come up with an answer. It’s not because people have not tried. They’ve been working on this sort of

Re: [time-nuts] NIST

Hi It’s back in the FCS archives. I don’t think it’s one of the ones you can hit without going through a paywall. It was a fun paper to attend. The chatter in the room was “interesting” to say the least. Bob > On Aug 31, 2018, at 1:07 PM, Brooke Clarke wrote: > > Hi Bob: > > Do you have

Re: [time-nuts] GNSS beam forming

On 8/31/18 9:38 AM, Gregory Maxwell wrote: On Fri, Aug 31, 2018 at 2:56 PM Attila Kinali wrote: "Just DSP work" is a tad bit more than you think. You are dealing with sevaral 1Msps of data, even for a simple L1 C/A receiver. If you are going multi-band-multi-GNSS you are usually in the 50MHz

Re: [time-nuts] Effects of Simple GPS jamming on GPSDO's ?

Hi Having spent a lot of my life designing GPSDO’s it’s a “that depends” sort of thing. For a simple noise jammer, yes, they pretty much all will go into holdover. When the jammer goes away, they come out of holdover. There are a few older units that may not do quite as well with various

Re: [time-nuts] NIST

Hi Bob: Do you have and info on that article that would allow me to read it? -- Have Fun, Brooke Clarke https://www.PRC68.com https://www.end2partygovernment.com/2012Issues.html axioms: 1. The extent to which you can fix or improve something will be limited by how well you understand how it

Re: [time-nuts] GNSS beam forming (was: NIST)

On Fri, Aug 31, 2018 at 2:56 PM Attila Kinali wrote: > "Just DSP work" is a tad bit more than you think. You are dealing > with sevaral 1Msps of data, even for a simple L1 C/A receiver. > If you are going multi-band-multi-GNSS you are usually in the 50MHz BW > at L1 and 80MHz BW at L2/L5 range,

Re: [time-nuts] WWV and legal issues

Strangely enough there are these devices called ‘computers’ which are rumored to be able to perform measurements and mathematical calculations. One of these ‘computers’ might be profitably employed to perform the necessary measurements calculations and deliver a useful output, Employing a

[time-nuts] Effects of Simple GPS jamming on GPSDO's ?

Hi: I'm curious if anyone knows how typical GPSDO's are likely to respond to simple GPS jammers ? Could the GPSDO be reasonably expected to go into hold over ? The use case I am thinking is along the lines of: -A commercial operation relies on a GPSDO for timing at a remote site. -A

Re: [time-nuts] NIST

Maybe this one is equivalent? On Fri, Aug 31, 2018 at 4:55 PM Attila Kinali wrote: > > On Thu, 30 Aug 2018 18:54:17 -0700 > Brooke Clarke wrote: > > > I wonder if anyone has tried using a small parabolic dish, like used for > > Free To

Re: [time-nuts] WWV and legal issues

Uh, folks...Would the apparently still on hiatus TVB approve of this on-going Urinary Olympiad? Just asking. And hoping post this won’t start another one. Tom Holmes, N8ZM -Original Message- From: time-nuts On Behalf Of Bob kb8tq Sent: Friday, August 31, 2018 11:16 AM To: Martin VE3OAT

Re: [time-nuts] Possible End of Daylight Savings Time in Europe?

Hi Here in the US, we have been creeping along getting rid of daylight time. At the rate we have been changing the magic dates, I’d bet we have it gone in a few hundred years :) Bob > On Aug 31, 2018, at 8:57 AM, John Franke wrote: > > See: >

Re: [time-nuts] WWV and legal issues

Hi That works fine if you are doing things manual to check a local standard. If you are trying to disipline a few thousand cell towers 24 hours a day … not so much. It also works for checking frequency. What modern systems need is time. That gets you into a whole world of resolving and

Re: [time-nuts] GNSS beam forming (was: NIST)

I/We track down things that jam weather radars. Mostly WiFi access points misconfigured. Which share many of the characteristics of GPS jammers 1 - small low powered 2 - one can ruin a pilots entire day 3 - distributed 4 - can literally be anywhere Stuff like this is why FCC blocked anyone

Re: [time-nuts] NIST

On Thu, 30 Aug 2018 18:54:17 -0700 Brooke Clarke wrote: > I wonder if anyone has tried using a small parabolic dish, like used for Free > To Air satellite TV and aimed it at a GPS > satellite track or at a WAAS geostationary satellite using a feed antenna > with reverse polarization from a

Re: [time-nuts] NIST

Hi “Backbone timing” gets done by boxes buried deep in systems. Those systems take years to design. The boxes that go in them similarly take years to get onto the market. Once designed deployment is far from instantaneous. Operators are always pressed by cost constraints. Adding anything

[time-nuts] Possible End of Daylight Savings Time in Europe?

See: https://www.msn.com/en-us/news/world/europe-ticks-closer-to-ending-daylight-saving-time/ar-BBMGU2d?ocid=spartandhp John WA4WDL ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to

[time-nuts] UK: Annual maintenance: 3–21 September 2018

From the NPL: Annual maintenance: 3–21 September 2018 The annual maintenance shutdown of the MSF service to allow safe maintenance of the masts and antennas, including greasing of the stays, will take place between 3 and 21 September 2018. The service will be off-air from 08:00 to 18:00 BST

[time-nuts] Fwd: Re: law and regulation applying to time.. was Re: OOPS on my wwv legal post

Weitergeleitete Nachricht Betreff: Re: [time-nuts] law and regulation applying to time.. was Re: OOPS on my wwv legal post Datum: Fri, 31 Aug 2018 11:25:44 +0200 Von: Dr. Götz Romahn An: Dr. David Kirkby For German regulations see here:

Re: [time-nuts] WWVB Signal Generator

> Wayne very good progress. You can actually feed the loop coild that exists > with the cap it should resonate. > Thats my plan at least. Thanks, Paul. Actually, after running a few more tests, the BALDR seems to now set quite reliably with the wire just wrapped around the ferrite rod as long as