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A DCF77, WWVB, JJY and MSF clock LF-band signal transmitter using the Raspberry Pi

Language: C++

Casio G-Shock time sync radio | Aug 2023
Related thread with local transmitters of time signal: https://news.ycombinator.com/item?id=27769403

https://github.com/hzeller/txtempus (A DCF77, WWVB, JJY and MSF clock LF-band signal transmitter using the Raspberry Pi)

ios and mac app: https://forum.audiob.us/discussion/49109/pips-a-radio-time-s...

(time sync over rf is super cool; I would be super interested if anyone has links to field surveys of time signal availability, potential gaps in coverage, and maps of said data.

How Does NTP (Network Time Protocol) Work? | Feb 2022
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Something that might be of interest: https://github.com/hzeller/txtempus

I live in an area without decent WWVB reception. So one of these days, my plan is to build a house range WWVB antenna so that I can get all the radio clocks in my house working consistently.
The Raspberry Pi as a Stratum-1 NTP Server (2012) | Aug 2021
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https://github.com/hzeller/txtempus

I made one for my Citizen RF synced watch. It works.
Receiving the WWVB time signal in Portugal (by accident) | Jul 2021
Ntp synced emulator for rpi which I use in Australia to sync my citizen skymaster

I didn't write this code. It has about 10-20cm of useful propagation distance (this is a transmitter and may breach local RF regulations)

We're outside the footprint of jjy, wwvb or dcf

https://github.com/hzeller/txtempus

DCF77 | Jun 2021
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And if you live outside reception distance of JJY or WWVB or DCF77 there's a raspberry pi local transmitter model and it runs off ntp.

Using it to sync my citizen watch in Australia.

https://github.com/hzeller/txtempus