Re: VLF: EbNaut tonite, 'SMS' via VLF

[Markus Vester <markusvester@aol.com>]

Thanks Paul for trying again! The samplerate in the wav header should be correct (which would make quite a difference at this number of symbols). Looks like despite the cardioid, the received signal was not strong enough and the night may have been too noisy here.

73, Markus

-----Ursprüngliche Mitteilung-----
Von: Paul Nicholson <vlf0403@abelian.org>
An: rsgb_lf_group <rsgb_lf_group@blacksheep.org>
Verschickt: Mo, 29. Mai 2017 19:59
Betreff: Re: VLF: EbNaut tonite, 'SMS' via VLF

Markus wrote:

> I managed to produce a seamless wav with 0.514 Hz samplerate:
> http://df6nm.bplaced.net/VLF/fec_tests/dl0ao_170524-25_join31uHz_wav.zip

Still no decode. The correlation peaks at 20.44 dB in 12.6 uHz with
offsets +2058 seconds and +0.1 Hz so it looks like the settings are
correct. I'm using the sample rate 0.5143924/sec from the
WAV inf1 header.

It's about 9 or 10dB short of decoding.

The previous attempt gave 22.09 dB in 12.6 uHz so it's lost a
couple of dB somewhere.

--
Paul Nicholson
--