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| To: | [email protected] |
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| Subject: | Re: LF: EbNaut decodes last night |
| From: | Markus Vester <[email protected]> |
| Date: | Fri, 30 Dec 2016 19:18:51 -0500 |
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| Sender: | [email protected] |
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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 <[email protected]> An: rsgb_lf_group <[email protected]> Verschickt: Fr, 30 Dez 2016 2:39 pm Betreff: AW: LF: EbNaut decodes last night Hi Joe,
the ones centered 12 minutes past the hour, ie. filenames 1230xx12.txt, please.
73, Markus
Von: [email protected]
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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