Re: VLF: EbNaut transmission on 8270.1 Hz again and again

[Markus Vester <markusvester@aol.com>]

After a few minutes worth of notebook sweat, unfortunately no decode here. The wav is at http://df6nm.bplaced.net/VLF/fec_tests/join_160429_1600.wav (513 kB), and the (empty) log file at http://df6nm.bplaced.net/VLF/fec_tests/join_160429_1600-log_nil.txt .

 

Thanks anyway for the challenge!

 

Best 73,

Markus (DF6NM)

 

 

-----Ursprüngliche Mitteilung-----
Von: Markus Vester <markusvester@aol.com>
An: rsgb_lf_group <rsgb_lf_group@blacksheep.org>
Verschickt: Sa, 30 Apr 2016 10:25 pm
Betreff: Re: VLF: EbNaut transmission on 8270.1 Hz again and again

Paul, Stefan,

 

great, congratulations both!

 

Strange that according to Stefan's forest grabber the PSK transmission was carrying on long after the scheduled end of sequence (19:01:22 ?).

 

Will now attempt to decode here as well.

 

All the best,

Markus

 

-----Ursprüngliche Mitteilung-----
Von: Paul Nicholson <vlf0403@abelian.org>
An: rsgb_lf_group <rsgb_lf_group@blacksheep.org>
Verschickt: Sa, 30 Apr 2016 9:23 pm
Betreff: Re: VLF: EbNaut transmission on 8270.1 Hz again and again


Stefan wrote:

> Start: 29.04.2016 16:00:02
> Period: 40
> Length: 45 (!)

I was impatient, with still 5549.6 seconds left
to go I decoded the message easily,

'CQ CQ DREAMERS BAND DE DK7FC IN JN49IK PSE KK'

Carrier S/N: 25.03 dB in 10.3 uHz
Eb/N0 = 0.1dB with constant reference phase. I'll
let the decoder go through a full phase search, it
may find a better decode with a phase pattern that
is closer to the diurnal. Later I'll decode the
full transmission, we should get a better Eb/N0.

That must be one of the longest messages decoded.
Only needed 1.8 GByte RAM so within reach of home
PCs.

... decoder has finished the phase search. No
improvement on the 0.1dB so looks like LWPC is close
to the mark with its phase prediction.

--
Paul Nicholson
--