Model 100489-14-01 wall clock
Just in case I need it again.
The signal quality fluctuates during the day (it is a lot better at night when there is less inionisation in the atmosphere), and is worsened by concrete walls (like our home).
Best way to get prolonged reception is at night, on the top floor behind a window or outside.
The clock usually needs between 3 and 10 minutes to pick up the DCF77 signal from the transmitter.
Wall clock manual: [Wayback] 100489_EN.pdf of which this abstract:
DCF77 HD-1688 clock mechanism
Numbers:
- M.SET button
- Press and keep pressed the M.SET button 1 at least 3 seconds. The wall clock switches into manual mode.
- Press and keep pressed the M.SET button again until the hands reach the correct position for you to set the time.
- Briefly pressing the M.SET button moves the hands forward in one minute steps to enable you to set the current time manually.
Note: After 8 seconds without pressing the M.SET button, the wall clock switches out of manual mode and keeps the time as normal. The manually set value is overwritten as soon as reception of the DCF radio time signal is successful.
- RESET button
- Press the RESET button 2 to reset the radio clock settings. Alternatively, remove the batteries from the device and insert them again.
- The product now automatically starts to search for the DCF radio time signal.
- REC button
- Press and keep pressed the REC button 3 at least 5 seconds. The wall clock attempts to receive the DCF radio time signal. This process takes a few minutes to complete.
- Battery compartment
- Battery type: 1 x 1.5 V ⎓ AA, LR6
More on the signal, transmitter and encoding: DCF77 – Wikipedia, where the below images are from:
DCF77 reception area from Mainflingen
DCF77 signal strength over a 24-hour period measured in Nerja, on the south coast of Spain 1,801 km (1,119 mi) from the transmitter. Around 1 AM it peaks at ≈ 100 µV/m signal strength. During the day, the signal is weakened by ionization of the ionosphere due to solar activity.
Another DCF77 clock I have: CSL Bearware 302658 DCF clock manual
–jeroen
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