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Re: VLF: New EbNaut announcement...

To: [email protected]
Subject: Re: VLF: New EbNaut announcement...
From: DK7FC <[email protected]>
Date: Thu, 23 Feb 2017 13:20:48 +0100
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GM Eddie, Jacek,

Thanks for the decode, i confirm the message is correct ;-) With such long messages, a false decode that makes some sense becomes most unlikely. I would never send messages like 'h;?T 7!F' :-)

Jacek, the QRN looked quite low here last night. Anyway i would say there is a clear SNR improvement on your side. We could certainly manage longer messages but then we may exclude some newcomers.
Actually i am now in the situation to run daily VLF transmissions, even during rain. The antenna current was almost stable at 700 mA during the whole transmission time.
I'm now waiting for a feedback from Alex/RN3AUS, and i am optimistic. You already see, the messages become longer and longer. The next attempt would be 10 characters which still seems to be realistic for a radius of 2000 km.
BTW EA5DOM is also within this radius! :-)

73, Stefan

Am 23.02.2017 09:35, schrieb g3zjo:

GM Stefan / Jacek

Successful decode in Northampton UK IO92ng. Message sent off list for confirmation.
list rank 0
reference phase  180  180  180  180
carrier RMS 6.366e-005 noise RMS 6.268e-006
carrier S/N 20.14 dB in 24.8 uHz
carrier Es/N0 -11.15 dB
carrier Eb/N0 3.55 dB
info bit period 884.21 seconds
symbol error rate 505/1344 = 37.574 %
Es/N0 from symbol errors -12.9 dB
Eb/N0 from symbol errors 1.8 dB
Shannon capacity 12.8 bits/hour
Shannon efficiency 31.8 %
elapsed 31 seconds

73 Eddie G3ZJO

Hi all,

Hereby i'm announcing the next EbNaut attempt for a longer night transmission, starting in a few hours:

f = 8270.100000 Hz
Start time: 22.Feb.2017   18:00:00 UTC
Symbol period: 30 s
Characters: 8
CRC bits: 16
Coding 16K21A
Duration: 11h, 12m, 0s
Antenna current: 700 mA

73, Stefan

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