Stefan and Paul,
Excellent results; nicely done.
The ratio of phase variation* Warsaw/Cumiana seems somewhat (factor of 2 or 3?)
disproportionate to the Warsaw/Cumiana Eb/N0 ratio. Do you have a feeling about
whether this is more likely to be attributable to timing or non-Gaussian noise
or a precision limit in the processing or (ref Stefan's comment): difference in
groundwave/skywave interference?
* day-to-day phase variation
73,
Jim AA5BW
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of DK7FC
Sent: Friday, January 12, 2018 7:24 AM
To: [email protected]
Subject: Re: VLF: Finally back on the 58 km band...
Thanks Paul for the summary. These informations are very useful for me and we
all get an impression about phase and SNR stability in this range of distances.
It looks like the phase is quite stable, i'm happy with the results.
Interestingly the phase is more stable in Cumiana than in Bielefeld.
Maybe this is a groundwave/skywave interference effect.
We didn't hear from Alex. Didn't he say he will be back on the 10th? I hope its
all fine.
73, Stefan
Am 12.01.2018 09:11, schrieb Paul Nicholson:
>
> Stefan wrote:
>
> > f = 5170.1000 Hz
> > Start time: 29.Dec.2017 15:00:00 UTC Symbol period: 30 s
> > Characters: 12
> > CRC bits: 20
> > Coding 16K21A
> > Duration: 14:56 [hh:mm]
>
> Fourteen transmissions. Two decodes at Cumiana.
> Problems with the uplink from Warsaw.
>
> Todmorden (881.2 km)
> --------------------
>
> 29/30 Eb/N0 +2.8 dB, S/N -26.2 dB/1Hz, phase 46.1 *Decoded*
> 30/31 Eb/N0 +4.1 dB, S/N -24.9 dB/1Hz, phase 44.2 *Decoded*
> 31/01 Eb/N0 +1.8 dB, S/N -27.1 dB/1Hz, phase 43.2 *Decoded*
> 01/02 Eb/N0 +1.5 dB, S/N -27.5 dB/1Hz, phase 57.6 *Decoded*
> 02/03 Eb/N0 -1.6 dB, S/N -30.6 dB/1Hz, phase 60.6;
> 03/04 Eb/N0 -1.6 dB, S/N -30.6 dB/1Hz, phase 50.3;
> 04/05 Eb/N0 0.0 dB, S/N -29.0 dB/1Hz, phase 61.3;
> 05/06 Eb/N0 +1.4 dB, S/N -27.6 dB/1Hz, phase 58.3 *Decoded*
> 06/07 Eb/N0 +0.1 dB, S/N -28.8 dB/1Hz, phase 56.2 *Decoded*
> 07/08 Eb/N0 -2.1 dB, H-field only, phase 64.1;
> 08/09 Eb/N0 -3.1 dB, S/N -32.1 dB/1Hz, phase 45.0;
> 09/10 Eb/N0 -0.2 dB, S/N -26.2 dB/1Hz, phase 34.9 *Decoded*
> 10/11 Eb/N0 +1.5 dB, S/N -27.5 dB/1Hz, phase 39.4 *Decoded*
> 11/12 Eb/N0 +1.1 dB, S/N -27.9 dB/1Hz, phase 37.8 *Decoded*
>
> Bielefeld (303.8 km DL4YHF)
> ---------------------------
>
> 29/30 Eb/N0 +8.6 dB, S/N -20.4 dB/1Hz, phase -53.5 *Decoded*
> 30/31 Eb/N0 +8.3 dB, S/N -20.6 dB/1Hz, phase -52.1 *Decoded*
> 31/01 Eb/N0 +8.1 dB, S/N -20.8 dB/1Hz, phase -56.3 *Decoded*
> 01/02 Eb/N0 +8.4 dB, S/N -20.6 dB/1Hz, phase -47.9 *Decoded*
> 02/03 Eb/N0 +4.0 dB, S/N -24.9 dB/1Hz, phase -38.1 *Decoded*
> 03/04 Eb/N0 +5.6 dB, S/N -23.4 dB/1Hz, phase -46.1 *Decoded*
> 04/05 Eb/N0 +8.8 dB, S/N -20.1 dB/1Hz, phase -47.0 *Decoded*
> 05/06 Eb/N0 +10.4 dB, S/N -18.5 dB/1Hz, phase -41.1 *Decoded*
> 06/07 Eb/N0 +11.5 dB, S/N -17.5 dB/1Hz, phase -43.2 *Decoded*
> 07/08 Eb/N0 +11.0 dB, S/N -18.0 dB/1Hz, phase -37.4 *Decoded*
> 08/09 Eb/N0 +8.6 dB, S/N -20.4 dB/1Hz, phase -49.1 *Decoded*
> 09/10 Eb/N0 +8.4 dB, S/N -20.5 dB/1Hz, phase -50.2 *Decoded*
> 10/11 Eb/N0 +9.0 dB, S/N -20.0 dB/1Hz, phase -51.4 *Decoded*
> 11/12 Eb/N0 +8.3 dB, S/N -20.6 dB/1Hz, phase -41.4 *Decoded*
>
> Warsaw (919.3 km SQ5BPF)
> ------------------------
>
> 29/30 Eb/N0 -5.4 dB, S/N -34.4 dB/1Hz, phase -20.3;
> 30/31 Eb/N0 -17.2 dB, S/N -46.2 dB/1Hz;
> 31/01 Eb/N0 -7.8 dB, S/N -36.8 dB/1Hz, phase -44.2;
> 01/02 Eb/N0 -6.1 dB, S/N -35.1 dB/1Hz, phase -36.1;
> 02/03 Eb/N0 -8.2 dB, S/N -37.1 dB/1Hz, phase 2.9;
> 03/04 Eb/N0 -10.2 dB, S/N -39.2 dB/1Hz, phase -33.1;
> 04/05 Eb/N0 -8.1 dB, S/N -37.1 dB/1Hz, phase -3.8;
> 05/06 Eb/N0 -6.4 dB, S/N -35.4 dB/1Hz, phase -44.2;
> 06/07 Eb/N0 -8.1 dB, S/N -37.1 dB/1Hz, phase -22.9;
> 07/08 Eb/N0 -7.5 dB, S/N -36.5 dB/1Hz, phase -20.8;
> 08/09 No data from rx site, uplink off;
> 09/10 Eb/N0 -9.9 dB, S/N -38.8 dB/1Hz, phase -23.3;
> 10/11 No data from rx site, uplink off;
> 11/12 No data from rx site, uplink off;
>
> All stacked: Eb/N0 +1.6 dB *Decoded* rank 11;
>
> Cumiana (504.6 km IK1QFK)
> -------------------------
>
> 29/30 Eb/N0 -5.4 dB, S/N -34.3 dB/1Hz, phase 176.7;
> 30/31 Eb/N0 -1.3 dB, S/N -30.3 dB/1Hz, phase -176.2;
> 31/01 Eb/N0 -4.9 dB, S/N -33.9 dB/1Hz, phase 177.4;
> 01/02 No data from rx site, ADSL fault;
> 02/03 No data from rx site, ADSL fault;
> 03/04 No data from rx site, ADSL fault;
> 04/05 Eb/N0 -1.6 dB, S/N -30.6 dB/1Hz, phase 174.5;
> 05/06 Eb/N0 -1.4 dB, S/N -30.4 dB/1Hz, phase 171.1;
> 06/07 Eb/N0 -1.1 dB, S/N -30.0 dB/1Hz, phase -172.8;
> 07/08 Eb/N0 -2.8 dB, S/N -31.8 dB/1Hz, phase -169.2;
> 08/09 Eb/N0 -5.8 dB, S/N -34.8 dB/1Hz, phase -179.3;
> 09/10 Eb/N0 -1.3 dB, S/N -30.2 dB/1Hz, phase 175.7;
> 10/11 Eb/N0 -0.3 dB, S/N -29.2 dB/1Hz, phase 173.6 *Decoded*
> 11/12 Eb/N0 -0.1 dB, S/N -29.1 dB/1Hz, phase 174.7 *Decoded*
>
> First nine stacked: Eb/N0 6.8 dB *Decoded*
>
> --
> Paul Nicholson
> --
>
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