From: <hvanesce@comcast.net>
To: <rsgb_lf_group@blacksheep.org>
References: <2dc1c9a3-63ea-4171-4ac2-0d592e4936aa@abelian.org>
In-Reply-To: <2dc1c9a3-63ea-4171-4ac2-0d592e4936aa@abelian.org>
Date: Wed, 27 Dec 2017 17:11:42 -0500
Message-ID: <022d01d37f5f$adbc0f00$09342d00$@comcast.net>
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Subject: LF: RE: New world record distance by W4DEX and IK1QFK
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Congratulations W4DEX, IK1QFK, Paul and all others on the new record; fine work, and inspiring.

73,

Jim AA5BW


-----Original Message-----
From: owner-rsgb_lf_group@blacksheep.org [mailto:owner-rsgb_lf_group@blacksheep.org] On Behalf Of Paul Nicholson
Sent: Wednesday, December 27, 2017 2:22 AM
To: rsgb_lf_group@blacksheep.org
Cc: Renato Romero
Subject: VLF: New world record distance by W4DEX and IK1QFK


W4DEX wrote:

 > 3 chars 16K21A CRC20
 > 30 second symbols
 > Start 22:30 UT

Success!

Decoded 'QRZ' at Cumiana (IK1QFK) with
Eb/N0 = +0.4 dB, BER 41.6%;

S/N -31.7 dB in 1Hz, -65.7 dB in 2.5kHz
(after sferic blanking);

List rank 5689, constant reference phase;

Distance is 7173.4 km which is a new world record for VLF message decode and a record distance for EbNaut at all bands.

Predicted Eb/N0 was +0.6 dB.

Decoded via the live VLF stream from Renato's E-field receiver.

These two stations already hold the record distance for carrier detection at VLF.  This result extends that to a message decode.

Signal data available in vlfrx-tools format:

  http://78.46.38.217/w4dex-171226-vlf15.vt

Decode with

  vtraw -oa w4dex-171226-vlf15.vt |
    ebnaut -dp16K21A -r1 -S30 -k20 -N3 -v -PU -L500000

Congratulations to both stations for a great result.

--
Paul Nicholson
--