Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on lipkowski.org X-Spam-Level: X-Spam-Status: No, score=-2.3 required=5.0 tests=FREEMAIL_FORGED_FROMDOMAIN, FREEMAIL_FROM,HEADER_FROM_DIFFERENT_DOMAINS,HTML_MESSAGE,RCVD_IN_DNSWL_MED, SPF_PASS,T_DKIM_INVALID autolearn=ham autolearn_force=no version=3.4.0 X-Spam-DCC: EATSERVER: mailn 1166; Body=2 Fuz1=2 Fuz2=2 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by lipkowski.org (8.14.4/8.14.4/Debian-8+deb8u1) with ESMTP id v2CEDNdf031885 for ; Sun, 12 Mar 2017 15:13:25 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1cn4Bd-00010q-Lo for rs_out_1@blacksheep.org; Sun, 12 Mar 2017 14:09:29 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1cn4Bd-00010h-7s for rsgb_lf_group@blacksheep.org; Sun, 12 Mar 2017 14:09:29 +0000 Received: from omr-a016e.mx.aol.com ([204.29.186.65]) by relay1.thorcom.net with esmtps (TLSv1:DHE-RSA-AES256-SHA:256) (Exim 4.89) (envelope-from ) id 1cn4BY-0001iB-LR for rsgb_lf_group@blacksheep.org; Sun, 12 Mar 2017 14:09:27 +0000 Received: from mtaomg-maa02.mx.aol.com (mtaomg-maa02.mx.aol.com [172.26.222.144]) by omr-a016e.mx.aol.com (Outbound Mail Relay) with ESMTP id 7FB0138000A7 for ; Sun, 12 Mar 2017 10:09:22 -0400 (EDT) Received: from core-acb08e.mail.aol.com (core-acb08.mail.aol.com [172.27.24.8]) by mtaomg-maa02.mx.aol.com (OMAG/Core Interface) with ESMTP id DFA0638000085 for ; Sun, 12 Mar 2017 10:09:21 -0400 (EDT) Received: from 188.192.95.60 by webprd-m03.mail.aol.com (10.74.16.251) with HTTP (WebMailUI); Sun, 12 Mar 2017 10:09:21 -0400 Date: Sun, 12 Mar 2017 10:09:21 -0400 From: Markus Vester To: rsgb_lf_group@blacksheep.org Message-Id: <15ac2da286a-4d21-8e1e@webprd-m03.mail.aol.com> In-Reply-To: MIME-Version: 1.0 X-MB-Message-Source: WebUI X-MB-Message-Type: User X-Mailer: JAS STD X-Originating-IP: [188.192.95.60] x-aol-global-disposition: G DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=mx.aol.com; s=20150623; t=1489327762; bh=cXCeZ1OHLcET9Jy0Lo4e/oI1sYAsJepnuz9jIRU3lUU=; h=From:To:Subject:Message-Id:Date:MIME-Version:Content-Type; b=cLQBXwv1FquAXXFRBzLSVUH7hGlBBMIuLuBgo5OBnNpD/IASVwuQwKiSMl+WsW+x4 RBsWOk3TV9A9jdOrfxQ8d90FqNTwRk1mJGLvkiX4DzjcM9U5Kyo78y3nDW2982A9hF A8GRuFyNMeaHAwavJssuIgdaOYyKILlHE40VlcnM= x-aol-sid: 3039ac1ade9058c5569158ea X-Scan-Signature: a44b221381f32eba3e5127fadf77bc3d Subject: Re: VLF: Now on 5170.0025 Hz Content-Type: multipart/alternative; boundary="----=_Part_43169_1638423377.1489327761512" 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 2.75 Status: RO X-Status: X-Keywords: X-UID: 10873 ------=_Part_43169_1638423377.1489327761512 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Danke Tom! That's a nice report. Distance between us would now be a bit und= er a wavelength ;-) As the antenna current dropped further to 0.13 A, I decided to interrupt th= e transmission and take a look. The coil was actually cold to the touch so = the reduction was not due to temperature-dependent copper resistance. Howe= ver that tuning had gone down by more than 100 Hz, probably due to the yogh= urt cups sinking slightly into one another, an effect which Stefan had also= observed earlier. Being eager to get on air, I hadn't used Lego spacers be= tween all of the cups. Inserting some more shims has now restored the reson= ance and original current. I will try to keep the carrier on air till the e= vening. Best 73, Markus (DF6NM) -----Urspr=C3=BCngliche Mitteilung-----=20 Von: DK1IS An: rsgb_lf_group Verschickt: So, 12. Mrz 2017 14:52 Betreff: Re: VLF: Now on 5170.0025 Hz Hello Markus, also a clear trace with 30 mHz in the Oberpfalz: S/(S+N) =3D 5 dB at a si= gnal level of -148,6 dBm. RX Perseus at DL0AO (JN59VK53NK), ANT Beverage 20= 0 m to South America - on VLF certainly a large lossy earthloop. The enclos= ed waterfall is evidentiary but rather short - I didn=C2=B4t want to block = our RX stn longer. 73 and good dreams, Tom, DK1IS www.qrz.com/db/dk1is Am 12.03.2017 um 14:01 schrieb Markus Vester: Thank you Stefan! Yes indeed, I'm glad to see a solid trace on your EW tree= -antenna. Having a sensitive grabber within reach is rather motivating.=20 Attached is a pic of the coil preparation, a temporary "ugly construction"= with some chunks of ferrite inside. In the meantime the current has droppe= d to ~ 0.15 A due to self-heating of the thin wire but it seems to be stabl= e now. Best 73, Markus (DF6NM) -----Urspr=C3=BCngliche Mitteilung-----=20 Von: DK7FC An: rsgb_lf_group Verschickt: So, 12. Mrz 2017 12:57 Betreff: Re: VLF: Now on 5170.0025 Hz Hello Markus,=20 It looks like you are there!! Even in 424 uHz. Very good, my congrats! You= are the second station transmitting on 58 km at all! EbNaut should be no problem there, good luck. 73, Stefan Am 12.03.2017 12:26, schrieb Markus Vester:=20 I've managed to tune to 5.17 kHz and am sending a straight carrier since 11= :18 UT. Due to the high coil resistance the antenna current is only 0.18 A = (as opposed to 0.4 A on 8.27 kHz, thus 11 dB less ERP). I wonder if the sig= nal may show up in Heidelberg... Best 73, Markus ------=_Part_43169_1638423377.1489327761512 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: quoted-printable
Danke Tom! That's a nice report. Distance between us wou= ld now be a bit under a wavelength ;-)

As the antenna current droppe= d further to 0.13 A, I decided to interrupt the transmission and take a loo= k. The coil was actually cold to the touch so the reduction was not due to&= nbsp;temperature-dependent copper resistance.  However that tuning had= gone down by more than 100 Hz, probably due to the yoghurt cups sinking sl= ightly into one another, an effect which Stefan had also observed earlier. = Being eager to get on air, I hadn't used Lego spacers between all of the cu= ps. Inserting some more shims has now restored the resonance and = original current. I will try to keep the carrier on air till the eveni= ng.

Best 73,
Markus (DF6NM)



-----Urspr=C3=BCnglich= e Mitteilung-----
Von: DK1IS <DK1IS@kabelmail.de>
An: rsgb_lf_= group <rsgb_lf_group@blacksheep.org>
Verschickt: So, 12. Mrz 2017 = 14:52
Betreff: Re: VLF: Now on 5170.0025 Hz

Hello Markus,

also a clear trace with 30 mHz in the Oberpfalz:  S/(S+N) =3D 5 = dB at a signal level of -148,6 dBm. RX Perseus at DL0AO (JN59VK53NK), ANT Beverage 200 m to South America - on VLF certainly a large lossy earthloop. The enclosed waterfall is evidentiary but rather short - I didn=C2=B4t want to block our RX stn longer.

73 and good dreams,

Tom, DK1IS
www.qrz.com/db/= dk1is

Am 12.03.2017 um 14:01 schrieb Markus Vester:
Thank you Stefan! Yes indeed, I'm glad to see a solid trace on yo= ur EW tree-antenna. Having a sensitive grabber within reach is rather motivating.

Attached is a pic of the coil preparation, a temporary&= nbsp;"ugly construction" with some chunks of ferrite inside. In the meantime the current has dropped to ~ 0.15 A due to self-heating of the thin wire but it seems to be stable now.

Best 73,
Markus (DF6NM)


-----Urspr=C3=BCngliche Mitteilung-----
Von: DK7FC &= lt;selberdenken@posteo.de>
An: rsgb_lf_group <rsgb_lf_group@blacksheep.org>
Verschickt: So, 12. Mrz 2017 12:57
Betreff: Re: VLF: Now on 5170.0025 Hz

Hello Markus,

It looks like you are there!! Even in 424 uHz. Very good, my congrats! You are the second station transmitting on 58 km at all!
EbNaut should be no problem there, good luck.

73, Stefan

Am 12.03.2017 12:26, schrieb Markus Vester:

I've managed to tune to 5.17 kHz and am sending a straight carrier since 11:18 UT. Due to the high coil resistance the antenna current is only 0.18 A (as opposed to 0.4 A on 8.27 kHz, thus 11 dB less ERP). I wonder if the signal may show up in Heidelberg.= ..

Best 73,
Markus



=20
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