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Re: VLF: Tonite...

To: [email protected]
Subject: Re: VLF: Tonite...
From: DK7FC <[email protected]>
Date: Fri, 10 Mar 2017 13:47:33 +0100
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Hi Eddie,

Great result! We are doing these message transfers on VLF quite regularly now over such a distance. 8 characters with such a good Eb/N0. 21.89 dB in 25 uHz, that would be good for 20 characters! http://abelian.org/ebnaut/calc.php?sndb=21.89&snbws=0.000025&snmps=&code=8K19&sp=33&crc=12&nc=20&submit=Calculate
Unfortunately i have just one antenna. There are several bands where i
want to do experiments. I'm thinking about 2970 Hz again. Maybe i will
run a 1-week transmission soon. The spectrogram at IK1QFK is very nice
and the larger area confirms even more that my recent 1-week carrier is
actually there, because there is nothing similar visible. It is now also
clear that i run that transmission during the worst time, with the
highest QRM/N :-/
73, Stefan

Am 10.03.2017 11:38, schrieb g3zjo:
On 10/03/2017 00:42, DK7FC wrote:

As already observed and decoded, another message is transmitted right now, same parameters as below, started 18 UTC.
This should decode in Moscow :-)
Message received in IO92ng16, forwarded to TX HQ for confirmation.

found XXXX XXX
list rank 0
reference phase    0    0    0    0
carrier RMS 7.732e-005 noise RMS 6.218e-006
carrier S/N 21.89 dB in 24.8 uHz
carrier Es/N0 -9.39 dB
carrier Eb/N0 5.30 dB
info bit period 884.21 seconds
symbol error rate 442/1344 = 32.887 %
Es/N0 from symbol errors -10.0 dB
Eb/N0 from symbol errors 4.7 dB
Shannon capacity 18.9 bits/hour
Shannon efficiency 21.6 %
elapsed 9 seconds

73 Eddie G3ZJO





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