From: Paul Nicholson <vlf0403@abelian.org>
To: rsgb_lf_group@blacksheep.org
References: <CA+DS1VKxM2bnhta-WJk_JpbPgn2Z6W_B9LkWzW_HvnVo_ijUdQ@mail.gmail.com>
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 <fb37d8f9-0440-9021-846a-dacb5239fa83@abelian.org>
Message-ID: <0be95ae0-9878-775f-5f95-45cb22331a80@abelian.org>
Date: Tue, 9 Jan 2018 20:07:03 +0000
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Subject: Re: LF: 8269.9 kHz EbNaut 02/01/18
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Dex wrote:

 > 8269.9 kHz
 > repeat message
 > 3 chars 16K21A CRC20
 > 30 second symbols
 > Start 22:30 UT

Results from nine repeats. The last night (07/08) was a poor S/N
at Warsaw, reducing the stack from +0.3 dB to -0.1 dB.  There was
a modification to Jacek's receiver on the 7th.  Did that change
the phase or reduce S/N?  No way to tell.  It was not the worst
reception at Warsaw, where the S/N appears to vary by 10dB or more
from one night to another.   Considering the dB or so lost in the
vorbis link, the stack might well decode if extracted from local
raw storage.  If so it would be a new distance record.

Hawley, Forest, and Todmorden were able to decode every night.
That's a pretty solid broadcast over 97 degrees of longitude
and 20 degrees of latitude.

An epic transmission which will surely inspire the construction
of a few more coherent receivers in North America.

Todmorden (6194.2 km)
---------------------

  27/28 Eb/N0  +9.2 dB, S/N -22.9 dB/1Hz, phase -140.9 *Decoded*
  28/29 Eb/N0  +5.4 dB, S/N -26.7 dB/1Hz, phase  108.7 *Decoded*
  29/30 Eb/N0 +10.2 dB, S/N -21.9 dB/1Hz, phase  -12.8 *Decoded*
  30/31 Eb/N0  +7.9 dB, S/N -24.2 dB/1Hz, phase  -32.4 *Decoded*
  31/01 Eb/N0  +2.9 dB, S/N -29.3 dB/1Hz, phase  115.6 *Decoded*
  01/02 No transmission
  02/03 Eb/N0  +4.2 dB, S/N -27.9 dB/1Hz, phase  -16.3 *Decoded*
  03/04 No transmission
  04/05 No transmission
  05/06 Eb/N0 +10.3 dB, S/N -21.9 dB/1Hz, phase   -4.2 *Decoded*
  06/07 Eb/N0 +11.1 dB, S/N -21.0 dB/1Hz, phase   +5.2 *Decoded*
  07/08 Eb/N0  +5.6 dB, H-field only,     phase   -6.5 *Decoded*

Bielefeld (6917.7 km)
---------------------

  27/28 Eb/N0 -2.6 dB, S/N -34.7 dB/1Hz, phase   71.2;
  28/29 Eb/N0 -2.3 dB, S/N -34.4 dB/1Hz, phase  -45.2;
  29/30 Eb/N0 -3.3 dB, S/N -35.5 dB/1Hz, phase -161.9;
  30/31 Eb/N0 +0.8 dB, S/N -31.3 dB/1Hz, phase  160.1 *Decoded*
  31/01 Eb/N0 -4.8 dB, S/N -36.9 dB/1Hz, phase  -41.2;
  01/02 No transmission
  02/03 Eb/N0 -5.4 dB, S/N -37.5 dB/1Hz, phase  176.0;
  03/04 No transmission
  04/05 No transmission
  05/06 Eb/N0 -4.7 dB, S/N -36.8 dB/1Hz, phase -178.5;
  06/07 Eb/N0 -0.2 dB, S/N -32.3 dB/1Hz, phase -132.7 *Decoded*
  07/08 Eb/N0  0.0 dB, S/N -32.1 dB/1Hz, phase -132.0 *Decoded*

Warsaw (7681.3 km)
------------------

  27/28 Eb/N0  -7.4 dB, S/N -39.6 dB/1Hz, phase  143.3;
  28/29 Eb/N0 -11.5 dB, S/N -43.7 dB/1Hz, phase   85.6;
  29/30 Eb/N0  -6.8 dB, S/N -40.0 dB/1Hz, phase  -46.2;
  30/31 Eb/N0 -16.5 dB, S/N -48.6 dB/1Hz;
  31/01 Eb/N0 -17.2 dB, S/N -49.3 dB/1Hz;
  01/02 No transmission
  02/03 Eb/N0  -5.8 dB, S/N -37.9 dB/1Hz, phase  -13.9;
  03/04 No transmission
  04/05 No transmission
  05/06 Eb/N0  -2.6 dB, S/N -34.7 dB/1Hz, phase  -35.4;
  06/07 Eb/N0  -2.9 dB, S/N -35.0 dB/1Hz, phase   -1.1;
  07/08 Eb/N0 -13.9 dB, S/N -46.0 dB/1Hz, phase -113.8;

  All stacked after tx phase correction: Eb/N0 -0.1 dB;
  Close to a decode after the night before but a poor
  night has moved it further away.

Cumiana (7173.4 km)
-------------------

  27/28 Eb/N0 +0.6 dB, S/N -31.6 dB/1Hz, phase 164.1 *Decoded*
  28/29 Eb/N0 -2.1 dB, S/N -34.2 dB/1Hz, phase  63.2;
  29/30 Eb/N0 -4.7 dB, S/N -36.9 dB/1Hz, phase -52.6;
  30/31 Eb/N0 -6.9 dB, S/N -39.0 dB/1Hz, phase -65.3;
  31/01 Eb/N0 -9.8 dB, S/N -41.9 dB/1Hz, phase 111.9;
  01/02 No transmission
  02/03 No data from rx site, ADSL fault;
  03/04 No transmission
  04/05 No transmission
  05/06 Eb/N0 -2.2 dB, S/N -34.3 dB/1Hz, phase  -8.4;
  06/07 Eb/N0 -6.1 dB, S/N -38.3 dB/1Hz, phase -47.0;
  07/08 Eb/N0 -3.1 dB, S/N -35.2 dB/1Hz, phase -35.3;

Hawley TX (1816.2 km)
---------------------

  27/28 Eb/N0 7.8 dB, S/N -24.3 dB/1Hz, phase  -86.3 *Decoded*
  28/29 Eb/N0 1.3 dB, S/N -30.8 dB/1Hz, phase -163.5 *Decoded*
  29/30 Eb/N0 2.9 dB, S/N -29.2 db/1Hz, phase   55.0 *Decoded*
  30/31 Eb/N0 8.7 dB, S/N -23.4 dB/1Hz, phase    2.8 *Decoded*
  31/01 Eb/N0 6.5 dB, S/N -25.6 dB/1Hz, phase  151.6 *Decoded*
  01/02 No transmission
  02/03 Eb/N0 4.0 dB, S/N -28.1 dB/1Hz, phase   10.9 *Decoded*
  03/04 No transmission
  04/05 No transmission
  05/06 Eb/N0 5.3 dB, S/N -26.9 dB/1Hz, phase   28.1 *Decoded*
  06/07 Eb/N0 5.6 dB, S/N -26.5 dB/1Hz, phase   54.1 *Decoded*
  07/08 Eb/N0 4.0 dB, S/N -28.1 dN/1Hz, phase   30.9 *Decoded*

Forest VA (254.2 km)
--------------------

  27/28 Eb/N0 21.2 dB, S/N -10.8 dB/1Hz, phase  115.9 *Decoded*
  28/29 Eb/N0 20.4 dB, S/N -11.8 dB/1Hz, phase  -14.0 *Decoded*
  29/30 Eb/N0 19.4 dB, S/N -12.7 dB/1Hz, phase -124.1 *Decoded*
  30/31 Eb/N0 20.0 dB, S/N -12.2 dB/1Hz, phase -143.9 *Decoded*
  31/01 Eb/N0 17.6 dB, S/N -14.5 dB/1Hz, phase   12.7 *Decoded*
  01/02 No transmission
  02/03 Eb/N0 18.5 dB, S/N -13.6 dB/1Hz, phase -140.2 *Decoded*
  03/04 No transmission
  04/05 No transmission
  05/06 Eb/N0 21.4 dB, S/N -10.7 dB/1Hz, phase -159.5 *Decoded*
  06/07 Eb/N0 22.9 dB, S/N  -9.3 dB/1Hz, phase  166.9 *Decoded*
  07/08 Eb/N0 21.1 dB, S/N -11.0 dB/1Hz, phase -172.0 *Decoded*

Phase shifts to apply before stacking
-------------------------------------

  27/28:    0 deg
  28/29: +118 deg
  29/30: +236 deg
  30/31: +260 deg
  31/01: +103 deg
  02/03: +245 deg
  05/06: +245 deg
  06/07: +245 deg
  07/08: +245 deg

--
Paul Nicholson
--