Web Multiband Simulator
Reproduce radio time signals to sync radio-controlled watches.
Please star the project on GitHub if you find it helpful!
Global Signal Coverage
Radio-controlled clocks automatically synchronize to one of these regional longwave transmitters. Select the one that suits your watch's supported frequencies and your location/timezone for the best results.
68.5 kHz
60 kHz
77.5 kHz
60 kHz
40 & 60 kHz
Sync your computer's time with an accurate time source (e.g., time.is, or a NTP server such as pool.ntp.org) to ensure the simulator transmits the correct time signals.
Use a headphone or the computer's built-in speaker. Maximize the volume for better reception, and place your radio-controlled clock close to the speaker.
Press Start Transmitting, set your clock to its manual sync/receive mode, and wait. Because these protocols transmit one frame per minute, it usually takes several minutes for a clock to successfully decode the time.