GEN170: DCF77 Code Generator 

GEN170: DCF77 Code Generator 

Modular Time- and Frequency Synchronization System for Industrial Applications in DIN Rail Chassis

The full-featured DIN railmount package has one power supply slot, a clock module slot, a CPU slot and two slots for additional input and output modules. Both, wide range AC and a 20-60 V DC power supply model are available.



Product Description

Generated Signals:

  • 77.5 kHz carrier frequency
  • Second marks to modulate the carrier’s amplitude
  • PRN sequence and PRN window to modulate the carrier’s phase
  • Pulse-per-Second (PPS) output

Additionally, an IRIG or AFNOR time code signal is generated, and a serial time string can be transmitted which includes the generated absolute date and time.

All signals are derived from a single 10 MHz reference frequency. That frequency can either be generated by a high quality on-board oscillator, or it can be supplied externally. The frequency source is selected by a jumper on the printed circuit board. The leading edge of the second marks can be synchronized by an external PPS input signal.

Internal date and time is always based on UTC. A configurable time offset can be applied to the UTC time base to compute a local standard time. Beginning and end of a period of daylight saving time can either be computed year by year based on a simple, configurable algorithm, or can be configured for the current year. GEN170 generates the proper changeover announcement flags as required by the DCF77 coding scheme.

Additionally, a date for insertion of a leap second can be configured. Actually, leap seconds are only inserted at UTC midnight. GEN170 automatically generates the coding sequences to announce the leap second as required for DCF77 and NTP, and also inserts the leap second correctly.

Additional information

Key Features

Key Features
Years of warranty: 3 RoHS compliant
Leap Second Capability
Daylight Saving Capability
Amplitude Modulation and Phase Modulation
TCXO Reference Frequency


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