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| Subject: | Re: LF: 2200M EbNaut Beacon |
| From: | Markus Vester <[email protected]> |
| Date: | Mon, 1 Oct 2018 09:55:19 -0400 |
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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 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 :-) 73, Rob - K3RWR FM18qi “Practicing the Art of Radio”
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