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Radio Time Systems


The radio time systems from GUDE enable the synchronization of individual clients as well as complete networks via DCF77 or GPS signal. The devices of Expert Mouse Clock and Expert GPS Clock Series are simply connected to the PC. After successful installation, they permanently synchronize the internal PC clock. The time servers of EMC Professional Series provide the current radio time of the DCF77 transmitter to the entire network through their integrated NTP server.

A time server is a network server that provides the exact time via a communication protocol (NTP or SNTP). It synchronizes with a reference time source (for example DCF77 or GPS) to Universal Time Coordinated (UTC). A time in UTC results in the corresponding Central European Time (CET) in Germany, Austria and other Central European countries by adding one hour. The summer Central European Summer Time (CEST) is obtained by adding two hours.

The reference time source is usually based on a very accurate atomic clock. This time can then be distributed to clients, servers or other devices on the network. Often mentioned in this context are: NTP server, NTP time server, GPS time server, DCF77 time server or atomic clock.

Protocols for time synchronization

       

Reference time sources

    

NTP - The Network Time Protocol (NTP) is the most widely used standard protocol for time synchronization in networks. It was developed by David L. Mills at the University of Delaware and published in 1985.

SNTP - The Simple Network Time Protocol (SNTP) is a simplified version of the Network Time Protocol (NTP). It is similar in structure to NTP and differs only by the algorithms used for time synchronization.

 

 


  

DCF77 - The abbreviation stands for: D: Germany, C: Longwave transmitter, F: Frankfurt am Main, 77: Transmission frequency 77.5 kHz.
The time signal transmitter DCF77 is a long wave transmitter in Mainflingen near Frankfurt am Main, Germany (DCF77 is the call sign assigned to the transmitter). With a range of 1,500 km, it supplies Germany and the west of Europe with the legal time. The transmitter has an accuracy with a relative standard deviation of the transmitted time of a maximum of 10-12. That corresponds to a lapse of one second in 30,000 years..

GPS - The Global Positioning System (GPS) is a global navigation satellite system for positioning on Earth. The satellites each have an atomic clock and send out the exact time via GPS signal. For the signal to be received, an antenna with a clear view of the sky is needed. GPS time servers can be used anywhere in the world.

      
Array
Expert Mouse Clock 0100
Time receiver signal DCF77
Connector serial
Integrated antenna yes
External antenna interface -
IP protection class 40
Array
Expert Mouse Clock 0102
Time receiver signal DCF77
Connector serial
Integrated antenna yes
External antenna interface -
IP protection class 68
Array
Expert Mouse Clock 0107
Time receiver signal DCF77
Connector USB
Integrated antenna yes
External antenna interface -
IP protection class 40
Array
Expert Mouse Clock 0108
Time receiver signal DCF77
Connector USB
Integrated antenna -
External antenna interface BNC
IP protection class 40
Array
Expert Mouse Clock 0131
Time receiver signal DCF77
Connector serial
Integrated antenna -
External antenna interface BNC
IP protection class 40
Array
EMC Professional 3001
Time receiver signal DCF77
Stand-alone NTP time server yes
LC display yes
Sensor interface -
Relais output yes
Case type desktop
Power supply 12 V
Array
EMC Professional 3011
Time receiver signal DCF77
Stand-alone NTP time server yes
LC display yes
Sensor interface yes
Relais output yes
Case 19 inch
Power supply 230 V
Array
Expert GPS Clock 0508
Time receiver signal GPS
Connector serial
Power supply USB
Cable length serial 2.4 m
Cable length USB 2 m
Array
Expert GPS Clock 0509
Time receiver signal GPS
Connector USB
Power supply USB
Cable length 2 m