DCF receiver as frequency normal ?

Hi.

Up here in Denmark we used to use the Kalundborg Longwave transmitter as frequency normal for frequency coumters.
This did stop at the first of year 2007 as the station closed.

I then thought, if I could use many of the DCF clocks I have here in the house.

Has anyone made that, or know where to find information about such a project ?

Venlig hilsen - Best regards - Erik Jakobsen
Licensed HAM-RADIO with the callsign OZ4KK
http://www.urbakken.dk
Registered Linux user #114875 with http://counter.li.org

I think it might be rather difficult since most DCF, MSF, WWVB time code receivers are essentially TRF designs with a tuning fork crystal to provide the needed selectivity.

A receiver using synchronous detection might be better suited for DCF carrier reception and extraction.

DCF's 77.5 kHz is a bit odd, but there is probably a way of dividing a stable crystal oscillator down in a way that it can be phase compared to DCF's carrier, with the resulting error voltage being fed back to the crystal oscillator to steer it into agreement with DCF's atomically controlled carrier.

I use a synchronous detection approach in the US using WWVB's carrier on 60 kHz. My homebrew receiver disciplines a 10 MHz crystal oscillator which in turn serves as a timebase for my homebrew frequency counter. It works very well.

73, de John, KD2BD

Visit John on the Web at:

	http://kd2bd.ham.org/

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