Hi,

I played with DCF77 for work a while ago, using the Conrad bits.
Important! : keep the antenna at least 2 meters from your PC! However, the unit is *not* affected by local radio & TV transmitters (we have a whole field full 500 meters from our factory!).
The software to decode the bits is not too difficult (even in QuickBasic!). I monitored reception over the weekend when summer time changed to winter time, & it went just like in the spec!

These days, maybe GPS modules are cheap enough. Just add power, & time & position are sent out on the serial line (9600 Baud?).
(I have a C example of the code for that somewhere).

Regards,
Richard.be

PS. my wife has a DCF77 alarm clock - always accurate (the clock!) & fewer buttons to push!