Also, the absolute phase of the carrier of DCF39 changes after each
period of keying, so you cannot average it through the FSK periods
Andy G4JNT
On 9 December 2015 at 21:40, Markus Vester <[email protected]> wrote:
> Hi Edgar,
>
> if I remember right, the DCF39 idle carrier is not exactly on 138830 Hz but
> about 0.55 Hz up. The frequency is also not very stable and there is a ~ 0.1
> Hz spread from the telegrams, so in a narrow spectrogram it may look more
> like a noise band.
>
> All the best,
> Markus (DF6NM)
>
> -----Ursprüngliche Mitteilung-----
> Von: edgar <[email protected]>
> An: rsgb_lf_group <[email protected]>
> Verschickt: Mi, 9 Dez 2015 10:13 pm
> Betreff: LF: VO1NA - carrier
>
> Results from last night.
>
> Data from Spectrum Lab EbNaut instance.
>
> https://dl.dropboxusercontent.com/u/101251787/VO1NA/data%209-12-2015.zip
>
> rsNTP was running to correct the PC clock.
>
> An attempt to use a GPS unit failed, as Spectrum lab reported several
> errors.
>
> Spectrum.
>
> https://dl.dropboxusercontent.com/u/101251787/VO1NA/VO1NA%209-12-2015%20250%20ms.gif
>
> Changes were made to the Spectrum lab set-up.
>
> A long term average plot was added. 1440 minutes, which may be too long.
>
> The spectrogram was added.
>
> DCF39 frequency was added to check if the set-up is working.
>
> It appears that it is not! As no DCF39 appeared.
>
> Some time will be spent checking the receiving set-up is functioning
> properly.
>
> There are issues with the internet connection and PC which need to be
> resolved.
>
> Thank you Joe for your signal.
>
> Regards,Edgar
> Moonah, Tasmania.
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