FWIW, for fun I measured the LF stations MSF, DCF, and TDF just a few days ago. The signals look like this from our site: http://www.anderswallin.net/wp-content/uploads/2017/02/MSF.jpg http://www.anderswallin.net/wp-content/uploads/2017/02/DCF.jpg http://www.anderswallin.net/wp-content/uploads/2017/02/TDF.jpg
I guess the +/- 40 Hz side-bands on TDF are by design? I have an SDR set up also, so the gnu-radio demodulators could run in parallel on each of these, and the sdr sampling clock could come from a local clock. One more project on the to-do list... Anders On Mon, Mar 6, 2017 at 12:42 AM, Iain Young <i...@g7iii.net> wrote: > On 05/03/17 20:23, paul swed wrote: > > Gilles what signal is that at 162KHz. A European station? Nice thats its C >> controlled. >> > > That's TDF from France. Their equivalent of WWV/MSF/DCF. Used to carry > the AM Station France Inter as well, but that went when France turned > off all LW, MW, and LORAN stations at the end of 2016. > > The Time Signal is Phase Modulated (I have a gnuradio decoder which > works very well if anyone is interested) > > See https://en.wikipedia.org/wiki/TDF_time_signal and > https://en.wikipedia.org/wiki/Allouis_longwave_transmitter > > With no AM modulation, there are obvious benefits with regards to using > it as a frequency reference. Average phase and frequency deviation is > zero over 200msec (see link above for details) > > > Iain > > PS, The signal is used by the French railways SNCF, the electricity > distributor ENEDIS, airports, hospitals according to the Allouis link > above > > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/m > ailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.