ATOM Lite

DIY JJY Simulator with ATOM Lite: Sync a Radio-Controlled Clock Without a Signal
How to use an M5Stack ATOM Lite and a JJY antenna board to build a low-cost JJY signal simulator for radio-controlled clocks in rooms where the standard time signal cannot be received. Total parts cost under JPY 5,000 — a fraction of commercial retransmitters. Includes setup steps and known limitations.
Tomokatsu Yukishita (雪下 智且)
Last updated on 2026/03/20 4 min read
DIY JJY Simulator with ATOM Lite: Sync a Radio-Controlled Clock Without a Signal