[time-nuts] RFDO - Experience and questions

Graham / KE9H ke9h.graham at gmail.com
Mon Mar 6 09:47:57 EST 2017


Anders:

What antenna are you using that you call the "mini-whip?"

Specifically, how long is the "whip?"

Thanks,
--- Graham

==

On Mon, Mar 6, 2017 at 3:57 AM, Anders Wallin <anders.e.e.wallin at gmail.com>
wrote:

> 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 <iain at 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
> >
> >
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