|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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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.
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:
Symbol Period: 1.5 sec
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”
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