Return-Path: X-Spam-DCC: paranoid 1290; 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=-0.3 required=5.0 tests=BAYES_00,DNS_FROM_AHBL_RHSBL, HTML_30_40,HTML_MESSAGE,RATWARE_GECKO_BUILD,SPF_PASS 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 u4TDje0g012717 for ; Sun, 29 May 2016 15:45:40 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1b70zF-00053A-Sf for rs_out_1@blacksheep.org; Sun, 29 May 2016 14:42:37 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1b70zF-00052t-HN for rsgb_lf_group@blacksheep.org; Sun, 29 May 2016 14:42:37 +0100 Received: from mout01.posteo.de ([185.67.36.65]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.87) (envelope-from ) id 1b70zD-0002t3-By for rsgb_lf_group@blacksheep.org; Sun, 29 May 2016 14:42:36 +0100 Received: from dovecot03.posteo.de (dovecot03.posteo.de [172.16.0.13]) by mout01.posteo.de (Postfix) with ESMTPS id D9D6E20976 for ; Sun, 29 May 2016 15:42:34 +0200 (CEST) Received: from mail.posteo.de (localhost [127.0.0.1]) by dovecot03.posteo.de (Postfix) with ESMTPSA id 3rHgt25rKRz5vN5 for ; Sun, 29 May 2016 15:42:34 +0200 (CEST) Message-ID: <574AF1CA.7080702@posteo.de> Date: Sun, 29 May 2016 15:42:34 +0200 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: <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> In-Reply-To: <5744FA27.6010703@posteo.de> X-Scan-Signature: 2015a9c9c70c0326c96b00c8a41f50f5 Subject: Re: VLF: EbNaut transmissions on lower frequencies?, pre-tests: 6.47kHz Content-Type: multipart/alternative; boundary="------------020903050102000507010709" 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 10.1.3.11 Status: O X-Status: X-Keywords: X-UID: 8176 This is a multi-part message in MIME format. --------------020903050102000507010709 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Hi Paul, What about your results? Nothing? 2 Remaining chances for a message. I would expect the 13 char message should have decoded. Do you still like playing the VLF experiments, or do you need a break? 73, Stefan Am 25.05.2016 03:04, schrieb DK7FC: > Hi Paul, > > The message just finished. The next one starts 4 UTC. Just in case the > 68 hour message does not decode, i'm trying to continue in smaller > steps using a day-night-day period of 36 hours: > > *f = 6470.00000 Hz > Start time: 25.05.2016 04:00:02 UTC > Symbol length: 140 s > Characters: 13 > CRC 16 > Coding 8K19A > Duration: 34h, 50m, 40s* > *Antenna current: 250 mA* > > 73, Stefan > > Am 21.05.2016 17:52, schrieb DK7FC: >> Hi Paul, >> >> Thanks! The message is correct. Our longest message so far on 6470 Hz :-) >> >> The WX forecast is no ideal for the next days: Rain! My transductor >> variometer is still not automatised and its tuning range is a bit >> small. So probably it is not possible to hold the antenna current >> during rain. I also saw that the losses are higher when it's wet, >> makes a difference of about 10%, i.e. -0.9 dB. >> With a stable antenna current of 250...260 mA and low QRN it could be >> possible to make the 20 character message with 100s symbols, into a >> day-night-day period. However this will be hard in the coming days. >> So i better prepare for 200s now: >> >> *f = 6470.00000 Hz >> Start time: 22.05.2016 04:00:02 UTC >> Symbol length: 200 s >> Characters: 20 >> CRC 16 >> Coding 8K19A >> Duration: 2d, 20h, 26m, 40s* >> *Antenna current: 200...260 mA (Rain!)* >> >> >> 73, Stefan >> >> >> Am 21.05.2016 04:15, schrieb Paul Nicholson: >>> Stefan wrote: >>> >>> > f = 6470.00000 Hz >>> > Start time: 20.05.2016 00:30:02 UTC >>> > Symbol length: 100 s >>> > Characters: 10 >>> > CRC 16 >>> > Coding 8K19A >>> >>> Copied 'THAT WORKS' >>> >>> Eb/N0 = +2.7 dB, constant reference phase >>> >>> Carrier: 19.25 dB in 13.3 uHz >>> >>> Error map: http://abelian.org/vlf/tmp/160520a.gif >>> >>> -- >>> Paul Nicholson >>> -- >>> --------------020903050102000507010709 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: 8bit Hi Paul,

What about your results? Nothing? 2 Remaining chances for a message.
I would expect the 13 char message should have decoded.
Do you still like playing the VLF experiments, or do you need a break?

73, Stefan

Am 25.05.2016 03:04, schrieb DK7FC:
Hi Paul,

The message just finished. The next one starts 4 UTC. Just in case the 68 hour message does not decode, i'm trying to continue in smaller steps using a day-night-day period of 36 hours:

f = 6470.00000 Hz
Start time: 25.05.2016   04:00:02 UTC
Symbol length: 140 s
Characters: 13
CRC 16
Coding 8K19A
Duration: 34h, 50m, 40s
Antenna current: 250 mA

73, Stefan

Am 21.05.2016 17:52, schrieb DK7FC:
Hi Paul,

Thanks! The message is correct. Our longest message so far on 6470 Hz :-)

The WX forecast is no ideal for the next days: Rain! My transductor variometer is still not automatised and its tuning range is a bit small. So probably it is not possible to hold the antenna current during rain. I also saw that the losses are higher when it's wet, makes a difference of about 10%, i.e.  -0.9 dB.
With a stable antenna current of 250...260 mA and low QRN it could be possible to make the 20 character message with 100s symbols, into a day-night-day period. However this will be hard in the coming days.
So i better prepare for 200s now:

f = 6470.00000 Hz
Start time: 22.05.2016   04:00:02 UTC
Symbol length: 200 s
Characters: 20
CRC 16
Coding 8K19A
Duration: 2d, 20h, 26m, 40s
Antenna current: 200...260 mA (Rain!)


73, Stefan


Am 21.05.2016 04:15, schrieb Paul Nicholson:
Stefan wrote:

> f = 6470.00000 Hz
> Start time: 20.05.2016   00:30:02 UTC
> Symbol length: 100 s
> Characters: 10
> CRC 16
> Coding 8K19A

Copied 'THAT WORKS'

Eb/N0 = +2.7 dB, constant reference phase

Carrier: 19.25 dB in 13.3 uHz

Error map: http://abelian.org/vlf/tmp/160520a.gif

--
Paul Nicholson
--

--------------020903050102000507010709--