[time-nuts] RFDO - Experience and questions

[Iain Young]

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