Re: LF: EbNaut decodes last night

[jcraig@mun.ca]

That's great news, Markus. Last night the pilot and rsNTP were used.
Would you like the 1231*12.txt files uploadad?

73
Joe

On Fri, 30 Dec 2016, Markus Vester wrote:

> Hi Joe,
>
>
> very nice results from your SpecLab files!
>
>
> I easily saw my carriers and the PSK symbols in each of the files, so there was 
> no need to make use of the pilot. Then in 6 out of 7 files, I decoded the 
> *OBELIX* message, and tweaked each time offset for best SNR. Knowing my 
> transmit start time (0.2 s after the hour), I could then derive that your PC 
> clock had been 2.1 to 2.6 seconds late. Note that this would have been 
> impossible if the signal hadn't shown up the rawsyms plot, which is why we 
> usually  depend on reliable timing.
>
>
> Using the time and frequency information, I calculated theoretical offsets for 
> the IW4DXW. who was transmitting 4.9994 Hz below me. Unfortunately Ric's signal 
> wasn't quite strong enough to produce a plausible decode (perhaps due to the 
> snow on his antenna).
>
>
> EbNaut received by VO1NA on 2016 Dec 30:
>
>
> VO1NA  --------DF6NM----------    ---VO1NA---  --------IW4DXW-----------
> file   foffs  start  sym  carr     rx  clock     foffs    start  decode
> hhmm    Hz     s      dB   dB      Hz    s         s        s
>
>
> 0122 -9.8955v 306.9     nil      drift  -2.1
> 0212 -9.8984  306.9   5.5  6.2   .1016  -2.1   -14.8978  306.7  nil, qrm
> 0312 -9.902   306.8  11.9 14.0   .098   -2.2   -14.9014  306.6    nil
> 0412 -9.9032  306.8  11.0 12.1   .0968  -2.2   -14.9026  306.6    nil
> 0512 -9.9043  306.6   3.7* 7.7   .0957* -2.4   -14.9037  306.4    nil   *glitch?
> 0612 -9.9048  306.4  10.4 11.5   .0952  -2.6   -14.9042  306.2    nil
> 0712 -9.9053  306.4   8.5  9.0   .0947  -2.6   -14.9047  306.2    nil
>
>
> I'd like to try a 13 character message tonight:
>
>
> 137490 Hz,
> 13 char, 2 s, 8k19a,
> starting each hour since 0 UT + 0.2 s,
> 5 min carrier before and after.
>
>
> All the best,
> Markus (DF6NM)
>
>
> -----Ursprüngliche Mitteilung-----
> Von: markusvester <markusvester@aol.com>
> An: rsgb_lf_group <rsgb_lf_group@blacksheep.org>
> Verschickt: Fr, 30 Dez 2016 2:39 pm
> Betreff: AW: LF: EbNaut decodes last night
>
>
>
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>
> Hi Joe,
>
>
>
> the ones centered 12 minutes past the hour, ie. filenames 1230xx12.txt, please.
>
>
>
> 73, Markus
>
>
>
>
> Von: jcraig@mun.ca
> Gesendet: Freitag, 30. Dezember 2016 14:19
> An: rsgb_lf_group@blacksheep.org
> Betreff: Re: LF: EbNaut decodes last night
>
>
>
> Hi Markus,
>
>
>
> Files 12300102, 112 122 133.txt etc are on disc.
>
> Which ones would you like to have uploaded?
>
>
>
> 73
>
> Joe