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

To: rsgb_lf_group@blacksheep.org
Subject: Re: VLF: EbNaut transmissions on lower frequencies?, pre-tests: 6.47kHz
From: Paul Nicholson <vlf0403@abelian.org>
Date: Sat, 4 Jun 2016 16:57:30 +0000
In-reply-to: <57514ED7.5080904@posteo.de>
References: <154c32c4dba-373a-24653@webprd-m58.mail.aol.com> <573CAF79.9040701@abelian.org> <573CBBF0.4030701@posteo.de> <573E5907.6020107@posteo.de> <573EA094.3040205@abelian.org> <573EF90F.1080201@posteo.de> <573FC4DA.3080107@abelian.org> <5740842D.3030000@posteo.de> <5744FA27.6010703@posteo.de> <574AF1CA.7080702@posteo.de> <57512B49.2080305@abelian.org> <57514ED7.5080904@posteo.de>
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Stefan wrote:

> Message 22.05.2016: 'cqcq dk7fc in jn49ik'

18.22 dB in 4.06 uHz,

 http://abelian.org/vlf/tmp/160604a.gif

which gives Eb/N0 = -2.35 dB on the 20 char message

> Message 25.05.2016: 'not very easy'

16.24 dB in 7.97 uHz,

 http://abelian.org/vlf/tmp/160604b.gif

and Eb/N0 = -2.46 dB.

Seems we are close with both messages, just needs another dB
to have a chance of decoding and another 2dB would make
decode very likely.

These must be amongst the narrowest bandwidth detections anyone
has used.   The day/night phase shift doesn't seem to be causing
us any problem.   But, I wonder if I could gain another dB by
adjusting for a nominal diurnal.   I can use these recordings to
try that.

--
Paul Nicholson
--

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