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I made one of these GPS -> WWVB simulators a couple years ago. There's a short write-up here, in case anyone is interested in reading about it: https://www.anis

I made one of these GPS -> WWVB simulators a couple years ago. There's a short write-up here, in case anyone is interested in reading about it: https://www.anishathalye.com/2016/12/26/micro-wwvb/ https://www.anishathalye.com/2016/12/26/micro-wwvb/ There are also some neat iPhone apps that use the audio circuitry to produce a low-power signal that can be picked up by radio-controlled clocks that are close by: https://itunes.apple.com/us/app/clock-wave/id1073576068?mt=8 https://itunes.apple.com/us/app/clock-wave/id1073576068?mt=8 A couple people mentioned the FCC and licensing issues in the comments below. As far as I know, as long as you're transmitting at a very low power (40 µV/m as measured at 300m), it's okay. This should be fine for personal use, but won't work on a municipal level.

xiii1408 8y ago
Dude! That's freaking awesome. I've been wanting to set up a GPS-based NTP server for a while, but haven't gotten around to it yet. I'll have to read through and take a look at the transmitting equipment you used; adding WWVB to it would be awesomesauce.
escherplex 8y ago
Not bad! While reading the article the thought occurred that if WWV were eliminated then this would be a good opportunity for a smart phone app to pipe a GPS derived time standard emulating WWV format into a < 100mw (Part 15) 5, 10, or 15 MHz attached transmitter. And the idea was already objectified.