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VLF: EbNaut also on 8270.033333 Hz

To: [email protected]
Subject: VLF: EbNaut also on 8270.033333 Hz
From: Markus Vester <[email protected]>
Date: Sat, 18 Feb 2017 08:41:29 -0500
Dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed;; s=20150623; t=1487425289; bh=ALPrX5KuQaM6FwjKYrQZVkF+kjFJ14fRopOQANPXxyE=; h=From:To:Subject:Message-Id:Date:MIME-Version:Content-Type; b=zambrgPCuwRbCmLD6UPCg+n1wiwSsxOHAEan8p5tInPd6o/fWLz5ZBTvF81U2/eKn 05yLDujXQPx0DTKldxOBaJPUIjrBf92Ik3oYqBydIWMYysGEkmvMZYhGXrp3DNSQ82 Alm9U/1LeFgc0FacpY5hLB3kwzB5DETRPhqxULPk=
In-reply-to: <[email protected]>
Reply-to: [email protected]
Sender: [email protected]
Hi Jacek, VLF,

from previous successful DK7FC decodes, it looks as if you might also be able to receive a ~10 dB weaker signal from here (10 uW EMRP). Apparently the rain has ended now, so I would like to try an overnight EbNaut transmission with only two characters:

Frequency: 8270.0333333 Hz,
2 characters, 8K19A, 18 bit CRC (!),
90 s symbols, message duration 9:36 hours,
start 2017-02-18 19:00 UT, end 4:36 UT (Sunday) 

The 1/30 Hz frequency offset has been chosen to avoid mutual interference with the announced DK7FC transmission on 8270.1 Hz: With the frequency spacing being an integer multiple of both symbolrates, and synchroneous bit timing, the symbol waveforms should be orthogonal because the "other" signal always undergoes a whole number of 360° cycles during the decoder's symbol integration interval.

Best 73,
Markus (DF6NM)

-----Ursprüngliche Mitteilung-----
Von: Jacek Lipkowski <[email protected]>
An: rsgb_lf_group <[email protected]>
Verschickt: Di, 14. Feb 2017 17:23
Betreff: Re: LF: Re: DK7FC EbNaut message on 8270.1 Hz decoded nr Moscow by RN3AUS

Nice decode here for your transmission on 13 Fen 2017 20:40

found rank 0 ber 3.0469e-01 Eb/N0 10.7 M -1.697070885e+01 [XX] ps [ 0 0 0 0 0]
carrier phase: 5.3
carrier Eb/N0: 10.9
carrier S/N: 21.44 dB in 32.6 uHz
elapsed 29

Switched the message to XX (sent to Stefan off list), so i don't spoil
other's fun

VY 73

Jacek / SQ5BPF
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