Message-ID: <565E1DDA.7020100@abelian.org>
Date: Tue, 01 Dec 2015 22:23:22 +0000
From: Paul Nicholson <vlf0403@abelian.org>
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Subject: Re: AW: LF: 8270 Hz traces again! AK
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Uwe wrote:

 > transmission CL because of heavy rain

Got a good carrier from you

  http://abelian.org/vlf/fbins.shtml#p=1448996400&b=090&s=sp

and this decoded easily in EbNaut using 10 second symbols,
eg 8K19A 2 characters,

  found rank 7: **  ps [  2   30   30   30   30]
  re-encode 140/368 ber 3.80e-01  Es/N0=-13.3 Eb/N0=1.6

Carrier decodes as a series of '*' characters which is handy
for testing.  Using the carrier I can try a range of message
lengths and symbol periods.

Using about an hour of carrier from 17:00 I got

  8K19A,  8 seconds, 3 chars: Eb/N0=-0.2
  16K21A, 4 seconds, 3 chars: Eb/N0=1.0
  8K23A,  7 seconds, 4 chars: no decode

I grabbed 3 hours of carrier, 15:00 to 18:00 and played around
with that but couldn't get a decode from it.  It's a bad time
of day due to the terminator passage, the phase goes all over
the place so I'm not too surprised.

Tested the carrier 15:00 to 16:00 and got

  8K23A,   7 seconds,   4 chars: -0.8 dB (BER 38.9% rank 679)
  16K21A, 3.4 seconds, 5 chars: -0.7 dB (BER 41.4%  rank 3200)

I couldn't get anything from the 90 minutes 15:00 to 16:30.

--
Paul Nicholson
--