DCF77 Time Code Generator GEN170

Solutions for Time and Frequency Synchronization

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GEN170
DCF77 Code Generator

Image Zoom		The time code generator GEN170 has been designed to generate all signals required to control or simulate a DCF77 compatible long wave transmitter, or provide the reference time for an NTP server. All output signals are based on one 10MHz reference frequency. This reference frequency is either generated by the on board quartz oscillator (TCXO, optional: OCXO) or applied externally. The beginning of a second can be synchronized with an external signal.

Key Features
DCF77 Code Generator

Leap Second Capability
Daylight Saving Capability
Amplitude Modulation and Phase Modulation
TCXO Reference Frequency

Description
DCF77 Code Generator

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.

Characteristics
DCF77 Code Generator

Display:	LC-display, 4 x 16 characters
Control elements:	Shows time/date and other information of the system. Also several user parameters can be controlled and changed with 4 keys. Parameter Setting: Changeover of daylight saving is generated automatically. Beginning and ending of daylight saving may either be defined by exact dates for a single year or using an algorithm which allows the generator to recompute the effective dates year by year. The date of insertion of a leap second can be edited, too. GEN77 generates the announcement of the leap second as well as the leap second itself. The length of the time marks 0 to 15 can be controlled by 16 TTL inputs.
Interface:	Single serial RS232 interface
Data format of interfaces:	Baudrate: 300, 600, 1200, 2400, 4800, 9600, 19200 baud Framing: 7N2, 7E1, 7E2, 8E1, 8N1, 8N2
Dimensions of the front panel:	21HP/3U (106mm x 128mm), with integrated membrane keyboard
Electrical connectors:	64 pin rear VG edge connector DIN 41612
Power supply:	+5V, +12V only when using OCXO)
Power consumption:	1,5 W
Current consumption:	+5V, @300mA +12V, @50mA (only when using OCXO)
Board type:	Eurocard
Board dimensions:	160mm x 100mm , 1,5mm Epoxy
Ambient temperature:	0 ... 50°C / 32 ... 122°F
Humidity:	Max. 85%
Options:	Also available as ready installed complete system GEN77TGP.
RoHS-Status of the product:	This product is fully RoHS compliant
WEEE status of the product:	This product is handled as a B2B category product. In order to secure a WEEE compliant waste disposal it has to be returned to the manufacturer. Any transportation expenses for returning this product (at its end of life) have to be incurred by the end user, whereas Meinberg will bear the costs for the waste disposal itself.