141–150 of 162 posts
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Deploying a GPS jammer in civilized territory is a great way to go to prison.
It's not like foreign adversaries care.
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Deploying a GPS jammer in civilized territory is a great way to go to prison.
Would it actually go so far? Would the police actually try to investigate from where came the jammer? Might the competing firm possibly even finance an investigation themselves privately? And if so, would the police then accept the evidence? People have done far more evil things for money.
[1]: https://www.nj.com/news/2013/08/man_fined_32000_for_blocking...
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Would it actually go so far? Would the police actually try to investigate from where came the jammer? Might the competing firm possibly even finance an investigation themselves privately? And if so, would the police then accept the evidence? People have done far more evil things for money.
The victim firm would definitely notice, they’d tell the FCC, and their investigators will show up with a device that literally points them to wherever the jammer is. If you do this for stupid, silly reasons you will get fined[1], if you do it in commission of another crime you will probably get made an example of. It doesn’t matter how evil you are, it’s hilariously easy to get caught doing this. [1]: https://www.nj…
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That is not correct at all. How did you arrive at that conclusion? GPS has its own independent timescale called GPS Time. GPS Time is generated and maintained by Atomic clocks onboard the GPS satellites (cesium and rubidium).
I think GP might’ve been referring to the part of Jeff’s post that references GPS, which I think may be a slight misunderstanding of the NIST email (saying “people using NIST + GPS for time transfer failed over to other sites” rather than “GPS failed over to another site”). The GPS satellite clocks are steered to the US Naval Observatory’s UTC as opposed to NIST’s, and GPS fails over to the USNO’s Alternate Master Cl…
GPS system time is currently 18s ahead of UTC since it doesn't take UTC's leap seconds into account [0]
This (old) paper from USNO [1] goes into more detail about how GPS time is related to USNO's realization of UTC, as well as talking a bit about how TAI is determined (in hindsight! - by collecting data from clocks around the world and then processing it).
[0] https://www.cnmoc.usff.navy.mil/Our-Commands/United-States-N... [1] https://ntrs.nasa.gov/api/citations/19960042620/downloads/19...
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Yes, either Rb, Cs, or H standards depending on which GNSS system you're using. For the most critical applications, you can license a system like Fugro AtomiChron that provides enhanced GNSS timing down to the level of a few nanoseconds. There are a couple of products that do similar things, all based on providing better ephemerides than your receiver can obtain from the satellites themselves. You can get AtomiChron…
> You can get AtomiChron as an optional subscription with the SparkPNT GPSDO, for instance ( https://www.sparkfun.com/sparkpnt-gnss-disciplined-oscillato ...). That's one hell of a healthy profit margin there O.o The SiTime MEMS oscillator is about 100€ for one single chip, the mosaic-T GPS receiver is about 400€. Add 50€ for the rest (particularly the power input section looks complicated) and 50€ for handling, prob…
There are so many artificial bureaucratic barriers to entry these days, and it's not getting better.
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Would it actually go so far? Would the police actually try to investigate from where came the jammer? Might the competing firm possibly even finance an investigation themselves privately? And if so, would the police then accept the evidence? People have done far more evil things for money.
The victim firm would definitely notice, they’d tell the FCC, and their investigators will show up with a device that literally points them to wherever the jammer is. If you do this for stupid, silly reasons you will get fined[1], if you do it in commission of another crime you will probably get made an example of. It doesn’t matter how evil you are, it’s hilariously easy to get caught doing this. [1]: https://www.nj…
I'm not surprised that somebody would try and do this. However it is just so stupid at every level.
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Who does use those top-level servers? Aren’t some of them propagating the error or are all secondary level servers configured to use dispersed top-level servers? And how do they decide who is right when they don’t match? Is pool.ntp.org dispersed across possible interference and error correlation?
You can look at who the "Stratum 2" servers are, in the NTP.org pool and otherwise. Those are servers who sync from Stratum 1, like NIST. Anyone can join the NTP.org pool so it's hard to make blanket statements about it. I believe there's some monitoring of servers in the pool but I don't know the details. For example, Ubuntu systems point to their Stratum 2 timeservers by default, and I'd have to imagine that NIST i…
Facebook had a really interesting engineering blog about building their own timeservers: https://engineering.fb.com/2020/03/18/production-engineering...
Really well written for anyone who is interested.
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I'm sure all of that is true, but so is "Department of Defense". They're also the largest holder of IPv4 space, still. https://bgp.he.net/report/peers#_ipv4addresses
Why does the DoD hold so many IPv4s?
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I'm sure all of that is true, but so is "Department of Defense". They're also the largest holder of IPv4 space, still. https://bgp.he.net/report/peers#_ipv4addresses
Why does the DoD hold so many IPv4s?
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I'll consider it clickbait... ... unless someone with real experience needing those tolerances chimes in and explains why it's true.
I'd have thought Jeff to be above clickbait, but here we are
They have A/B testing infrastructure available to creators for exactly that purpose.
If you say "Oh but he doesn't have to use that" you are wrong. If a creator's videos get low enough click through and "engagement", youtube just stops showing it to people.
Jeff, like every creator on youtube, is in an antagonistic deathmatch for your attention with people like Mr. Beast, and Youtube would rather five Mr Beasts than a thousand Jeffs. Youtube builds their platform to empower and enrich Mr Beast, and to force everyone else to adopt more of Mr Beasts methods to stay getting views, and getting their paycheck
It does not matter if you are "subscribed" to a channel for example. Youtube will still fail to show you new videos from your subscriptions if you don't play the stupid game enough.
Stop blaming the people who did not at all make this choice. Blame Youtube. Support platforms, like nebula and whatever that guntube service is called, with real money.
Did you know this video existed before it was posted to HN? I did, because it showed up in my feed even though I am not subscribed to jeff, because he plays the game well. I watched it too because I had no idea that weather was causing such a problem in Colorado and love hearing about NIST and the people who basically run the infrastructure of the internet that everyone takes for granted.