There’s a layer beyond mere legal compliance. Clock and Location systems can indeed pose a life safety issue in ways approaching impossible to predict. Yes, it is Damned illegal to screw with such signals and even if you think you got away with no damages- it’s a when, not if about the epic doom. It’s why we used to confine some work to a REAL shield room. And yes- that gets their clock whacker signal out into danger space. I can sketch out a credible risk of a Ham Shack/SW listener or someone with old twinlead fed roof antennas etc having that parasitic coupling. My concern is some cretin who uses a bit more power or better antennas- or just gets Darwin Lucky in re-radiation coupling to other wires! Nope- the inch of wire in a safe demo is not that liable to go major distances at these frequencies. For the love of Darwin… be mindful of how far these signals can really go. Posted in ATtiny Hacks, clock hacks, Radio Hacks Tagged attiny, attiny45, clock, radio, wwvb Post navigationĪs a tool to show how Radio Clock works- wonderful work. We can guess this would be useful if your radio controlled clock isn’t receiving a signal for some reason, but the fact that April 1st is just a few days away gives us a much, much better idea. The end result of this build is an extremely small one-chip device that can change the time of any remote-controlled clock. After that, it’s a simple matter of encoding the time signal. This signal must be modulated, of course, and the most common radio controlled clocks use an extremely simple amplitude modulation that can be easily replicated by changing the duty cycle of the carrier. You might think replicating a 70 kW, multi-million dollar radio transmitter to set your own clock might be out of reach, but with a single ATtiny45, just about everything is possible.Įven though WWVB has enough power to set clocks in LA, New York, and the far reaches of Canada, even a pitifully underpowered transmitter – such as a microcontroller with a long wire attached to a pin PWMing at 60kHz – will be more than enough to overpower the official signal and set a custom time on a WWVB-controlled clock. It’s WWVB, the NIST time signal radio station that sends the time from several atomic clocks over the airwaves to radio controlled clocks across the continent. The UltrAtomic® clock reads this information and, at the appropriate instance, automatically advances the hands one hour in the spring and eleven hours in the fall (to move back one hour), even if the signal is not received on the day of the transition.Deep in the Colorado foothills, there are two radio transmitters that control the time on millions of clocks all across North America. The new WWVB broadcast provided by the NIST includes a notification for the daylight savings time transitions well ahead of when they are to occur. Now you can enjoy UltrAtomic® accuracy, while view time zone around the world. UltrAtomic® clocks allow you to select any time zone with a custom setting. The reception reliability of the technology has been validated in the most challenging locations and scenarios, and has been demonstrated successfully throughout all of North America. It leverages the advanced modulation scheme and new data encoding. UltrAtomic® technology digitally processes the received signal via an integrated circuit within the clock.
UltrAtomic clocks operate even in the harshest conditions, where the signal-to-noise ratio interferes with radio-controlled clock reception using the legacy AM signal broadcast. This line of products is the first and only one in the market to be based on this enhanced broadcast, offering unparalleled reception. La Crosse Technology is introducing a line of radio-controlled clocks based on its innovative UltrAtomic® technology, designed to receive the phase-modulated enhanced WWVB broadcast signal that NIST has recently introduced.
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