Low Frequency Time SIgnal Receiver - DCF77  77.5KHz
 
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 (20 mi) 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.
 
 
Very sensitive and capable Time Signal receiver module with antenna tuned to time signal transmitter DCF77.
 
In the North East of England I can easily receive the time signals.  See video.
 
The DCF77 transmitter also send weather data as well in the first 14 seconds of each minute cycle.
 
I have connected the data output line to an ESP-32 VROOM module and made a small test programme to detect Data pulses from the radio module - first steps in decoding the acutal date and time information.  Currently, early stages of development but a nice little project to improve my coding and experience with working with the ESP-32 module.
 
Transmitter Information:
Location    Mainflingen longwave transmitter, Mainflingen, GermanyCoordinates    50.01556°N 9.01083°EElevation    113 m (370 ft)Operator    Media Broadcast GmbH on behalf of the PTBFrequency    77.5 kHzPower    50 kWBegan operation    1 January 1959; continuous date and time information was added in June 1973    Official range    2,000 km (1,200 mi)
 
The antenna induction signal is sent to the IC for amplification, demodulation, and then identified by the MCU.
 
Technical Specifications
 
Product number: DCF-3850N-800
RCCM category: DCF/77.5KHz single frequency module
PCBA size: 21.5x13.5x1.0mm/FR4
Antenna size: AP3x8x50mm/High Q
Nominal frequency: 77.5KHz±300Hz
Sensitivity: 28±2dB
Receiving IC: SP6007
 
       • Operating voltage: 1.1...3.3 V
       • Current consumption: 85 µA max
       • Receiving frequency: 77.5KHz
 
       • connect:
             ⇒ Ground = Pin G
             ⇒ Operating Voltage = Pin V
             ⇒ data = pin T
             ⇒ Power On/Off = Pin P1
       • Important note:
             ⇒ PIN P1 is an on/off switch and must be set to logic low.
 
Package Included:
1*Receiver module