DCF77 experimental transmitter

Construction of a simple transmitter of 77.5 KHz, to be able to set time DCF77 clocks that don't correctly receive the signal from the German transmitter. DCF77 is a radio station located in Germany, that transmits in long wave (LW). It began to function as a standard frequency station on January 1, 1959, and from June 1973 the date and time information was incorporated into the transmission. The DCF77 signal uses the amplitude change coding to transmit time information, digitally coded by reducing the amplitude of the carrier up to 15% of its nominal level for 0.1 or 0.2 seconds, at the beginning of each second. A reduction of 0.1 seconds indicates a binary 0; and a reduction of 0.2 seconds indicates a binary 1. The quality of the PCBs is excellent and the delivery time has been much less than other manufacturer.


May 10,2019
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