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Re: VLF: EbNaut transmissions on lower frequencies?, pre-tests: 6.47kHz

To: [email protected]
Subject: Re: VLF: EbNaut transmissions on lower frequencies?, pre-tests: 6.47kHz
From: DK7FC <[email protected]>
Date: Tue, 27 Dec 2016 12:14:16 +0100
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Hallo Paul,

Many thanks for the schönes Weihnachtsgeschenk Paul. I think it is a Geschenk for both of us. We are a good team i find. I guess that's the longest message (by amateurs) on VLF so far. When starting on 46 km in summer, i didn't expect that we will manage such good results there, so i'm quite satisfied.

There is still some confusion about unstable colours (-> phase) on my local monitors, although things should works fine. There is no frequency offset or drift, so the SpecLabs sample rate correction must work. However the colours looks like a nice rainbow :-) On the other side i can decode my EbNaut messages with 0 errors. Strange. That was the reason why i stopped the DEC.24th transmission. But maybe this has not been necessary. Anyway, now we are here :-)

It is now time for me to leave the 46 km band (again) and i will move to the 58 km band. I will start a new thread... This thread has started on May, 3th, 2016 :-)

73, Stefan



Am 25.12.2016 17:35, schrieb Paul Nicholson:

Ich habe ein kleines Weihnachtsgeschenk für Stefan!

The 75 character message received at 6470 Hz:

 "HABE DEN MUT DICH DEINES EIGENEN VERSTANDES ZU BEDIENEN
  - IMMANUEL KANT -"

by coherent summing of 7 daily transmissions.

Eb/N0 = -0.2 dB, BER 32.44%, constant reference phase.

List decoding rank: 1987053.

S/N: 26.14 dB in 36.9 uHz, -52.2dB in 2.5kHz.

 Day         Phase  Eb/N0
 2016-12-18  41.2    -5.5
 2016-12-19  47.2   -10.1
 2016-12-20  38.0    -8.2
 2016-12-21  40.5   -10.1
 2016-12-22  48.0   -11.0
 2016-12-23  50.9    -8.8
 2016-12-24  42.9   -12.2 (not used, skipped)
 2016-12-25  46.6    -7.1

--
Paul Nicholson
--


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