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Re: LF: 2200M EbNaut Beacon

To: [email protected]
Subject: Re: LF: 2200M EbNaut Beacon
From: Markus Vester <[email protected]>
Date: Mon, 1 Oct 2018 15:10:02 +0000 (UTC)
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Hi Rob,

here's the result for 41 files recorded in Nuernberg during the last three nights. By correlation to the known message, the Eb/N0 was estimated for each transmission until our sunrise. As expected, best SNR occurred around 3 UT, and the median Eb/N0 of all 41 transmissions was -6.6 dB.

The best three files were then fed to the decoder, producing two decodes after 2:30 (+1.0 dB) and 3 UT (-0.2 dB) last night Oct 1st. The third-best file (Sep 30 2:30, -1.0 dB) failed to decode. Thus putting the threshold at -0.6 dB between the second and the third, we find that for 50 % success rate on our path you would either need to increase power by 6 dB, or reduce the number of characters by a factor of 4.

Note that the Eb/N0 output from the decoder was a couple of dB higher than from correlation, for example 3.2 dB instead of 1.0 dB, but the threshold calculations should still be valid.

Best 73,
Markus (DF6NM)

-----Ursprüngliche Mitteilung-----
Von: Rob Renoud <[email protected]>
An: RSGG_LF <[email protected]>
Verschickt: Fr, 28. Sept 2018 15:49
Betreff: LF: 2200M EbNaut Beacon

Hello 2200 Meters EbNaut,

I will run the EbNaut beacon on  28, 29 and 30 September from 2300 UTC to 1100 UTC this coming weekend as follows:

Code:  8K19A
Symbol Period:  1.5 sec
CRC: 16
Number of Char:  15 (K3RWR_FM18QI_73)
Signal Bits:  992
Duration:  1488 sec (00:24:48.00)
Frequency:  137470.000 Hz
TX Sequence:  2 X per hour starting on minutes 00 and 30
Power:  1 Watt EIRP

Reports and comments welcome :-)

Rob - K3RWR
“Practicing the Art of Radio”

Attachment: 10010248_result.png
Description: PNG image

Attachment: 10010248_sym.png
Description: PNG image

Attachment: EbN0_vs_time.png
Description: PNG image

Attachment: EbN0_statistics.png
Description: PNG image

Attachment: results_k3rwr_df6nm_15char.txt
Description: Text document

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