Content for DCF77

DCF77

DCF77 is a German longwave time signal and standard-frequency radio station. It started service as a standard-frequency station on 1 January 1959. In June 1973 date and time information was added. Its primary and backup transmitter are located at 50°0′56″N 9°00′39″E in Mainflingen, about 25 km south-east of Frankfurt am Main, Germany. The transmitter generates a nominal power of 50 kW, of which about 30 to 35 kW can be radiated via a T-antenna.

Talking clock

“Retro clock with seven segment display, WDC65C02 microprocessor and SP0256 voice synthesis chip. Few years ago I began my experiments with retro microprocessors. Their eventual result was a design of board consisting WDC65C02 CPU, EPROM, static RAM chip and couple …

Pico Railway Clock

“Reinvigorating a handsome old clock and making it super-accurate, without any internet. Uses a Raspberry Pi Pico, a radio antenna and a couple of components to emulate a signal from a Mother clock. The DCF77 signal is a radio signal …

Putting an old digital clock (with an outdoor thermometer) on steroids

“According to the label on the back, it is a rebranded “Electronics Tomorrow LTD.” model no. 7904. It supports DCF77 time synchronization and has been working reliably for the past 20 years. But recently I wasn’t so thrilled with …

“Connect” to an atomic clock in space! GPS, DCF77

“This project is a clock with radio receivers which can receive the exact time from the GPS satellites or from the DCF77 transmitter. This project is a clock with radio receivers which can receive the exact date and time from …