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Re: VLF: 300 mA on 6470 Hz

To: rsgb_lf_group@blacksheep.org
Subject: Re: VLF: 300 mA on 6470 Hz
From: DK7FC <selberdenken@posteo.de>
Date: Thu, 12 Oct 2017 12:44:39 +0200
In-reply-to: <887fe87a-7149-c2c9-f65a-6c56e63d59de@abelian.org>
References: <15ec7c794b3-bff-66@webjas-vac136.srv.aolmail.net> <alpine.DEB.2.11.1710022138560.734@mailn.lipkowski.org> <59D2BD65.4080909@posteo.de> <59D4B109.27652.1415B4FA@mike.dennison.ntlworld.com> <7737095b-edc9-8b5f-ebf5-2a6b2884d425@abelian.org> <ffe7e282-b039-8ad6-f1da-400b64131a98@abelian.org> <aac1062e-eadd-c7c8-0ecc-efac0ff94363@abelian.org> <59D7940D.7080102@posteo.de> <f3db3efe-7c22-90f2-d6cf-ad853de9fb48@abelian.org> <59DA4E78.7020804@posteo.de> <25d84b3d-2077-a3dc-426c-3f9b92940205@abelian.org> <59DB730D.4080803@posteo.de> <887fe87a-7149-c2c9-f65a-6c56e63d59de@abelian.org>
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Hello Paul,

Thanks for the overview, good to have. The phase is always very interesting to compare, we can now say it varies less than +- 10 deg, not bad. I am in contact with RN3AUS. So far he got no decode. He provided the txt files containing the daily data to me. We already thought about asking you for help. But i like to transmit (at least) for 10 nights before i give up. Yesterday we got a set of 6 days. I stacked them in Markus' stacking tool for windows. The individual days are normalised by the square of the rms voltage. I tried to get a decode with and without normalisation and with all six days and also with just the 5 best days. No decode. Unfortunately the QRN gets higher each day in the moment. 4 days could have been enough but that was based on days like 7th/8th.
We will see. It is a good tutorial to train patience :-)
Meanwhile the day time transmissions will give faster results and are a chance for more stations.
73, Stefan

PS: I thought your E field is not available. Is the 10...12th with or without E field?
Am 12.10.2017 08:36, schrieb Paul Nicholson:
Stefan wrote:

> f = 6470.100000 Hz
> Start time: 05.October.2017  16:00:00 UTC (daily)
> Symbol period: 20 s
> Characters: 16
> CRC bits: 19
> Coding 16K21A
> Duration: 12h

Here's the full set of overnight transmissions:

 5th/6th   Eb/N0 -2.2 dB  phase -148.4 deg
 6th/7th   Eb/N0 +0.9 dB  phase -165.4 deg
 7th/8th   Eb/N0 -0.5 dB  phase -163.1 deg
 8th/9th   Eb/N0 -4.4 dB  phase -150.2 deg
 9th/10th  Eb/N0 -2.9 dB  phase -146.5 deg
 10th/11th Eb/N0 -3.1 dB  phase -158.8 deg
 11th/12th Eb/N0 -3.5 dB  phase -157.1 deg

 Stacked: Eb/N0 6.3 dB  phase -156.6 deg

Looks like we were lucky with the signal 6/7th.

--
Paul Nicholson
--





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