Return-Path: X-Spam-DCC: paranoid 1233; Body=2 Fuz1=2 Fuz2=2 X-Spam-Checker-Version: SpamAssassin 3.1.3 (2006-06-01) on lipkowski.org X-Spam-Level: X-Spam-Status: No, score=-0.5 required=5.0 tests=BAYES_00,DNS_FROM_AHBL_RHSBL, HTML_50_60,HTML_MESSAGE,RATWARE_GECKO_BUILD autolearn=no version=3.1.3 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by paranoid.lipkowski.org (8.13.7/8.13.7) with ESMTP id tB8FoAAV000874 for ; Tue, 8 Dec 2015 16:50:11 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1a6KPM-000683-U6 for rs_out_1@blacksheep.org; Tue, 08 Dec 2015 15:42:28 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1a6KPM-00067u-GH for rsgb_lf_group@blacksheep.org; Tue, 08 Dec 2015 15:42:28 +0000 Received: from mout01.posteo.de ([185.67.36.65]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.86) (envelope-from ) id 1a6KOJ-0001cF-A2 for rsgb_lf_group@blacksheep.org; Tue, 08 Dec 2015 15:42:27 +0000 Received: from dovecot03.posteo.de (dovecot03.posteo.de [172.16.0.13]) by mout01.posteo.de (Postfix) with ESMTPS id 1BEBC2082C for ; Tue, 8 Dec 2015 16:41:11 +0100 (CET) Received: from mail.posteo.de (localhost [127.0.0.1]) by dovecot03.posteo.de (Postfix) with ESMTPSA id 3pFQhl5jf4z5vN0 for ; Tue, 8 Dec 2015 16:41:11 +0100 (CET) Message-ID: <5666FA16.5030401@posteo.de> Date: Tue, 08 Dec 2015 16:41:10 +0100 From: DK7FC User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; de; rv:1.9.1.8) Gecko/20100227 Thunderbird/3.0.3 MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org References: In-Reply-To: X-Scan-Signature: 2015a9c9c70c0326c96b00c8a41f50f5 Subject: Re: LF: 8270 Hz traces again! AK Content-Type: multipart/alternative; boundary="------------010901090702090207050209" X-SA-Exim-Scanned: Yes Sender: owner-rsgb_lf_group@blacksheep.org Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group X-SA-Exim-Rcpt-To: rs_out_1@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false X-Scanned-By: MIMEDefang 2.56 on 10.1.3.10 Status: O X-Status: X-Keywords: X-UID: 5662 This is a multi-part message in MIME format. --------------010901090702090207050209 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Hi Uwe, My active VLF antenna inside a plastic tube was hanging down since a few days, see the spectrograms. Now i repaired that and the signal levels are back to their normal level. You are coming nicely in 424 uHz! Looking forward to an incoming trace now. I'm thinking about playing on VLF a bit. Maybe we can do a VLF QSO some day. 73, Stefan Am 08.12.2015 12:44, schrieb uwe-jannsen@kabelmail.de: > > carrier on the air. > the message starts at 18:00:00 > _wedj8wx_ > *Von:* uwe-jannsen@kabelmail.de > *Gesendet:* 03.12.2015 13:45 > *An:* > *Betreff:* AW: Re: AW: LF: 8270 Hz traces again! AK > > hope the transmission can stay 24 hours a day on the air soon. > so your analysis may show less phase destructions at night hours. > Uwe/dj8wx > > *Von:* Paul Nicholson > *Gesendet:* 01.12.2015 23:27 > *An:* > *Betreff:* Re: AW: LF: 8270 Hz traces again! AK > > Uwe wrote: > > > transmission CL because of heavy rain > > Got a good carrier from you > > http://abelian.org/vlf/fbins.shtml#p=1448996400&b=090&s=sp > > > and this decoded easily in EbNaut using 10 second symbols, > eg 8K19A 2 characters, > > found rank 7: ** ps [ 2 30 30 30 30] > re-encode 140/368 ber 3.80e-01 Es/N0=-13.3 Eb/N0=1.6 > > Carrier decodes as a series of '*' characters which is handy > for testing. Using the carrier I can try a range of message > lengths and symbol periods. > > Using about an hour of carrier from 17:00 I got > > 8K19A, 8 seconds, 3 chars: Eb/N0=-0.2 > 16K21A, 4 seconds, 3 chars: Eb/N0=1.0 > 8K23A, 7 seconds, 4 chars: no decode > > I grabbed 3 hours of carrier, 15:00 to 18:00 and played around > with that but couldn't get a decode from it. It's a bad time > of day due to the terminator passage, the phase goes all over > the place so I'm not too surprised. > > Tested the carrier 15:00 to 16:00 and got > > 8K23A, 7 seconds, 4 chars: -0.8 dB (BER 38.9% rank 679) > 16K21A, 3.4 seconds, 5 chars: -0.7 dB (BER 41.4% rank 3200) > > I couldn't get anything from the 90 minutes 15:00 to 16:30. > > -- > Paul Nicholson > -- --------------010901090702090207050209 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: 8bit Hi Uwe,

My active VLF antenna inside a plastic tube was hanging down since a few days, see the spectrograms. Now i repaired that and the signal levels are back to their normal level.
You are coming nicely in 424 uHz! Looking forward to an incoming trace now.
I'm thinking about playing on VLF a bit. Maybe we can do a VLF QSO some day.

73, Stefan

Am 08.12.2015 12:44, schrieb uwe-jannsen@kabelmail.de:

carrier on the air.
the message starts at 18:00:00
wedj8wx
 
Von: uwe-jannsen@kabelmail.de
Gesendet: 03.12.2015 13:45
An: <rsgb_lf_group@blacksheep.org>
Betreff: AW: Re: AW: LF: 8270 Hz traces again! AK
 

hope the transmission can stay 24 hours a day on the air soon.
so your analysis may show less phase destructions at night hours.
Uwe/dj8wx

 
Von: Paul Nicholson <vlf0403@abelian.org>
Gesendet: 01.12.2015 23:27
An: <rsgb_lf_group@blacksheep.org>
Betreff: Re: AW: LF: 8270 Hz traces again! AK
 

Uwe wrote:

> transmission CL because of heavy rain

Got a good carrier from you

http://abelian.org/vlf/fbins.shtml#p=1448996400&b=090&s=sp

and this decoded easily in EbNaut using 10 second symbols,
eg 8K19A 2 characters,

found rank 7: ** ps [ 2 30 30 30 30]
re-encode 140/368 ber 3.80e-01 Es/N0=-13.3 Eb/N0=1.6

Carrier decodes as a series of '*' characters which is handy
for testing. Using the carrier I can try a range of message
lengths and symbol periods.

Using about an hour of carrier from 17:00 I got

8K19A, 8 seconds, 3 chars: Eb/N0=-0.2
16K21A, 4 seconds, 3 chars: Eb/N0=1.0
8K23A, 7 seconds, 4 chars: no decode

I grabbed 3 hours of carrier, 15:00 to 18:00 and played around
with that but couldn't get a decode from it. It's a bad time
of day due to the terminator passage, the phase goes all over
the place so I'm not too surprised.

Tested the carrier 15:00 to 16:00 and got

8K23A, 7 seconds, 4 chars: -0.8 dB (BER 38.9% rank 679)
16K21A, 3.4 seconds, 5 chars: -0.7 dB (BER 41.4% rank 3200)

I couldn't get anything from the 90 minutes 15:00 to 16:30.

--
Paul Nicholson
--
 
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