|Subject:||Re: LF: EbNaut on LF|
|From:||Markus Vester <[email protected]>|
|Date:||Tue, 16 Aug 2016 05:43:15 -0400|
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unfortunately I had not set up recordings in time so no data here for a decode attempt. My LF-RX soundcard was also affected by a hiccup with swapped E and H channels until 1:30 UT. Thereafter, your signal was well visible as a +-5 Hz wide "noise band" around 137.777 kHz, so the 0.2 s EbNaut would surely have been decodable with more than enough SNR.
Apart from going for a "longest EbNaut sequence ever" type record, I'm asking myself whether it would not be better to split a long message into several shorter ones. This probably depends both the fading pattern and on the use-case, i.e. whether a partly reception is also valuable or completely worthless. For example, if the SNR (EbN0) was +2 dB for the first half and -2 dB for the second,
you'd probably still get the combined long message but only the first of two short ones. On the other hand, if it was 0 dB and -4 dB, you'd get the first short message, but nothing at all with the long one. On the practical side, shorter messages would be far less demanding on long-term phase stability, as well as CPU and memory.
All the best,
Von: jcraig <[email protected]>
An: rsgb_lf_group <[email protected]>
Verschickt: Di, 16 Aug 2016 2:47 am
Betreff: Re: LF: EbNaut on LF
QRG changed from 137.477 to 137.777 kHz at 0045 utc. Sorry for the
Reports of the OP32 sigs from R7NT, F5WK, Graham, Markus, Hugh, Stefan
Dominico and others who I inadvertently left out are gratefully
Tonight by popular demand starting 2330 and every 15 mins, EbNaut 155
chars 0.2 seconds 771.2 s message duration, 4K19A polynomial. 500w
3.5A to the 100m RL. Reports most welcomed. Good luck to all.
(Let's hope I've set it up correctly!)
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