DCF 77 Receiver#

  1. Configure the DIP switch to DCF positon.

  2. Set value A in SYNC menu items o1 (Timezone of Synchronization Source), o2 (Type of Synchronization) and in dISP menu item d2 (Time Zone of Time and Date).

  1. Connect the DCF 77 receiver to the clock terminal board placed on the anchoring plate (LINE IN terminals) using a twin‑wire cable.

    ../../_images/dcf.svg ../../_images/dcf-dark.svg

  1. The maximum wire length depends on its diameter (approx. 100–300 m at 0.25 mm2 ).

  2. In case the connection is correct and the input signal is at high level, the LED on the receiver is flashing periodically once a second with one pulse left out at the 59th second.

    Warning

    If the polarity is incorrect, the LED does not flash. In such case, interchange the two wires.

  3. Install the receiver at a place with a high‑level radio signal. Do not install the receiver near sources of interfering signals, such as personal computers, TV sets or other types of power consumers (the digital clock itself generates interfering signals too).

  4. Position the receiver with its transparent cover (DCF 450) or the arrow on the cover (DCF 4500) facing the transmitter (located in Frankfurt, Germany). Presuming the good quality DCF 77 signal the synchronization takes place in approx. 3 to 4 minutes. In case of poor quality of the signal (mainly during the day time), the first time setting is to be done manually. The red LED of the receiver displays a working connection by flashing once a second without flickering.