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> This automatic feature would be perfect if it acted as a "press this button to setup"

You press the receive button on the Casio.

> but the issue is that the messages are sent very sporadically so you either need to wait almost a full day for it to sync

The signal is constant. You probably had bad reception. In case of DCF77 it needs one minute to transmit "date + time + parity". I have seen my G-Shock syncing in under two minutes.



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