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Re: LF: EbNaut decodes last night

To: [email protected]
Subject: Re: LF: EbNaut decodes last night
From: [email protected]
Date: Sat, 31 Dec 2016 08:42:46 -0330 (NST)
In-reply-to: <[email protected]>
References: <[email protected]>
Reply-to: [email protected]
Sender: [email protected]
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)


-----Urspr√ľngliche Mitteilung-----
Von: markusvester <[email protected]>
An: rsgb_lf_group <[email protected]>
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: [email protected]
Gesendet: Freitag, 30. Dezember 2016 14:19
An: [email protected]
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





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