Previous  Top  Next

Windows Time Server

Hopf PCI DCF77/GPS Receiver
Hopf Elektronik manufactures GPS satellite clocks as well as radio clocks designed for the DCF77 time signal broadcast by the National Institute of Natural and Engineering Sciences in Germany. This driver supports the Hopf Elektronik clock model 6039 PCI board. Both, the DCF and GPS variants are supported. You may visit Hopf Elektronik on the web at , or email technical support at

Hopf 6039 PCI-Bus Receiver


Hopf 6039 Operation

When the unit is slotted into an internal PCI bus of a personal computer and connected to its external GPS antenna, the Hopf 6039 diagnostic software will display the synchronization status of the unit on the Date & Time tab in the Status field. Satellite signal strength is displayed on the Satellites tab. When the Hopf 6039 clock has successfully synchronized to satellite time or DCF77 time, the status indication changes to "clock is radio synchronous with crystal control standard time" as shown below.  If you wish PresenTense Server to use the timestamps obtained from your Hopf clock prior to this stage, see "flag1" under Driver Tunables at the bottom of this page.


Hopf 6039 Benchmark Tests

The Hopf 6039 PCI bus board has performed extremely well in benchmark tests with sub-millisecond accuracy.


Driver tunables :






offset calibration factor


one to four letters

server identifier, default GPS or DCF


0 or 1

Use value 1 to force synchronization when only "crystal driven".