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=-0.3 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 u4CCC5H4019258 for ; Thu, 12 May 2016 14:12:05 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1b0pJ3-0007Md-B6 for rs_out_1@blacksheep.org; Thu, 12 May 2016 13:01:29 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1b0pJ2-0007MU-PW for rsgb_lf_group@blacksheep.org; Thu, 12 May 2016 13:01:28 +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 1b0pIz-0004Ro-Cm for rsgb_lf_group@blacksheep.org; Thu, 12 May 2016 13:01:27 +0100 Received: from dovecot03.posteo.de (dovecot03.posteo.de [172.16.0.13]) by mout01.posteo.de (Postfix) with ESMTPS id 28F7A20928 for ; Thu, 12 May 2016 14:01:23 +0200 (CEST) Received: from mail.posteo.de (localhost [127.0.0.1]) by dovecot03.posteo.de (Postfix) with ESMTPSA id 3r5BR66X33z5vNC for ; Thu, 12 May 2016 14:01:22 +0200 (CEST) Message-ID: <57347092.5010005@posteo.de> Date: Thu, 12 May 2016 14:01:22 +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: <154a41ff88f-6fda-1482a@webprd-m47.mail.aol.com> In-Reply-To: <154a41ff88f-6fda-1482a@webprd-m47.mail.aol.com> X-Scan-Signature: ad9c0e3658f56f4dbb01cd425a6a8031 Subject: Re: VLF: EbNaut transmissions on lower frequencies?, pre-tests: 6.47kHz Content-Type: multipart/alternative; boundary="------------090602080309090902020607" 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: 8038 This is a multi-part message in MIME format. --------------090602080309090902020607 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Am 12.05.2016 10:40, schrieb Markus Vester: > Should we donate a few Lego blocks? ;-) > 73, Markus Aaaargh, no no no!! ;-) Better use iron powder cores instead. They are useful. Also from an educational view it is better to let children play with original Amidon iron powder cores and let them build first coils and resonators! :-) BTW i'm now trying to modify SpecLab to keep the antenna current constant (by measuring the feedback signal level and steer the output volume level by that value) even when the reseonance is lost. Of course this will only work in a small range, maybe +-2 dB. But 2 dB is a LOT, we know. 73, Stefan > -----Ursprüngliche Mitteilung----- > Von: DK7FC > An: rsgb_lf_group > Verschickt: Do, 12 Mai 2016 10:33 am > Betreff: Re: VLF: EbNaut transmissions on lower frequencies?, > pre-tests: 6.47kHz > > Hi Paul, VLF, > > I have prepared my transmit site so i can run permanent transmissions > now! Also the antenna current meter has been re-calibrated (actually > no re-adjustment was necessary). > > Just in case the extreme QRN will stop in the morning, i will run a > new transmission: > > *f = 6470.00000 Hz > Start time: 12.05.2016 00:00:02 UTC > Symbol length: 100 s > Characters: 3 > CRC 16 > Coding 8K19A > Duration: 11h, 33m, 20s* > *Antenna current: 200 mA* > > Maybe this one will work better. And, to be honest, in the last > transmissions the antenna current fell to about 170 mA after some time > because the coils sagged a bit into each other due to the heat. But > now this process should have stopped and the resonance was > re-adjusted. I can measure a stable 205 mA now during the time of the > observation. > > 73, Stefan > > > > Am 11.05.2016 11:22, schrieb Paul Nicholson: > > > > I'm asking myselfe if you are working on the decode > > all the time > > Yes, still working on the 19 char message. I think I'm > about 1.3 dB short of decoding it. Quite a challenge > because overnight 7th/8th was very noisy. > > > This morning the QRN is very low, a pity that i have > > not been on the air. > > The last few nights have been quiet. Typical! > > -- > Paul Nicholson > -- > --------------090602080309090902020607 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: 8bit
Am 12.05.2016 10:40, schrieb Markus Vester:
 
Should we donate a few Lego blocks? ;-)
 
73, Markus
Aaaargh, no no no!! ;-) Better use iron powder cores instead. They are useful.
Also from an educational view it is better to let children play with original Amidon iron powder cores and let them build first coils and resonators! :-)

BTW i'm now trying to modify SpecLab to keep the antenna current constant (by measuring the feedback signal level and steer the output volume level by that value) even when the reseonance is lost. Of course this will only work in a small range, maybe +-2 dB. But 2 dB is a LOT, we know.

73, Stefan

 
 
 
-----Ursprüngliche Mitteilung-----
Von: DK7FC <selberdenken@posteo.de>
An: rsgb_lf_group <rsgb_lf_group@blacksheep.org>
Verschickt: Do, 12 Mai 2016 10:33 am
Betreff: Re: VLF: EbNaut transmissions on lower frequencies?, pre-tests: 6.47kHz

Hi Paul, VLF,

I have prepared my transmit site so i can run permanent transmissions now! Also the antenna current meter has been re-calibrated (actually no re-adjustment was necessary).

Just in case the extreme QRN will stop in the morning, i will run a new transmission:

f = 6470.00000 Hz
Start time: 12.05.2016   00:00:02 UTC
Symbol length: 100 s
Characters: 3
CRC 16
Coding 8K19A
Duration: 11h, 33m, 20s
Antenna current: 200 mA

Maybe this one will work better. And, to be honest, in the last transmissions the antenna current fell to about 170 mA after some time because the coils sagged a bit into each other due to the heat. But now this process should have stopped and the resonance was re-adjusted. I can measure a stable 205 mA now during the time of the observation.

73, Stefan



Am 11.05.2016 11:22, schrieb Paul Nicholson:

> I'm asking myselfe if you are working on the decode
> all the time

Yes, still working on the 19 char message.  I think I'm
about 1.3 dB short of decoding it.  Quite a challenge
because overnight 7th/8th was very noisy.

> This morning the QRN is very low, a pity that i have
> not been on the air.

The last few nights have been quiet.  Typical!

--
Paul Nicholson
--

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