Home |
Search |
Today's Posts |
|
#1
|
|||
|
|||
Q: Rebroadcast WWV?
In article ,
Falky foo wrote: | rig it to your car and drive around resetting everyone's clocks! | that would be a hoot! It would, but there's a few problems -- 1) It would probably qualify as harmful interference and would probably annoy the FCC, no matter how low your power. (On the other hand, it would be next to impossible to pin it on you unless your car had some massive antenna array on top.) (Sidenote: with an appropriate antenna and 100 watts, you could probably reprogram the clocks in the entire city. Though a sutiable antenna could be very difficult to come by, since 1/4 wavelength = 1250 meters.) 2) most of those clocks only sync up a few times per day (and often only at night), and almost all of them require several `cycles' (and each cycle lasts a minute) to do so. So you'd have to catch them right when they're syncing up, and they'd have to receive your signal the entire time.) And if the clock does continuously re-sync, then it will go back to the correct time signal the moment it stops picking up your signal. But yes, it could qualify as a good `hack' if done properly. -- Doug McLaren, "It's got a cop motor, a 440 cubic inch plant, it's got cop tires, cop suspension, cop shocks. It's a model made before catalytic converters so it'll run good on regular gas. What do you say, is it the new Bluesmobile or what?" |
#2
|
|||
|
|||
Q: Rebroadcast WWV?
On 15/11/2005 11:15 PM, Doug McLaren wrote:
In article , Falky foo wrote: | rig it to your car and drive around resetting everyone's clocks! | that would be a hoot! It would, but there's a few problems -- 1) It would probably qualify as harmful interference and would probably annoy the FCC, no matter how low your power. (On the other hand, it would be next to impossible to pin it on you unless your car had some massive antenna array on top.) (Sidenote: with an appropriate antenna and 100 watts, you could probably reprogram the clocks in the entire city. Though a sutiable antenna could be very difficult to come by, since 1/4 wavelength = 1250 meters.) 2) most of those clocks only sync up a few times per day (and often only at night), and almost all of them require several `cycles' (and each cycle lasts a minute) to do so. So you'd have to catch them right when they're syncing up, and they'd have to receive your signal the entire time.) And if the clock does continuously re-sync, then it will go back to the correct time signal the moment it stops picking up your signal. But yes, it could qualify as a good `hack' if done properly. Yup, this is a good example of a "data poisoning" hack. For those receivers that only sync up to a single source (and with the caveats you mention regarding when and how such receivers sync up) this is a definite hack. For those of us who rely on upstream NTP sources for their computers, that protocol is relatively more robust. Even if some of the so-called upper strata servers use WWV (or local equivalent) to get their time, the protocol is designed to rejects times that obviously out of sync with others. So those coincidental upper strata sources would have to sync up at the same time to these radio sources for it propagate. I've seen my local NTP server reject entire subnets because it was a few seconds off. Eventually those subnets are trusted again. Recently, wasn't there a problem with some of these signals? I recall that folks who have those fancy set-themselves watches did not have accurate time for a few weeks. |
#3
|
|||
|
|||
Q: Rebroadcast WWV?
On 15/11/2005 11:15 PM, Doug McLaren wrote:
"It's got a cop motor, a 440 cubic inch plant, it's got cop tires, cop suspension, cop shocks. It's a model made before catalytic converters so it'll run good on regular gas. What do you say, is it the new Bluesmobile or what?" Fix the lighter. |
Reply |
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Forum | |||
rebroadcast scanner audio over internet laws | Scanner |