That would be 36ns group delay variation if I did the math correctly.
OK
And in article P. Hetzel: Time dissemination via the LF transmitter DCF77
using a pseudo-random phase-shift keying of the carrier, 2nd EFTF
Neuchatel, 1988., they conclude with timing results of about 2..10e-6 s
RMS over ~1000km distance.
However, I do not know what is the reality and whether such a performance
is limited by atmosphere/ground conditions, or whether it could be better
within LF band.
However, what material are you using for the ferrite? The material can have a
significant tempco.
In my project, I have used noname rod taken from within DCF77 alarm clock.
If I will recreate it, I will look for something defined at the store.
Regards,
Marek
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