Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by klubnl.pl (8.14.4/8.14.4/Debian-8+deb8u2) with ESMTP id x44I5XSN021270 for ; Sat, 4 May 2019 20:05:34 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1hMyz1-0001jB-Cp for rs_out_1@blacksheep.org; Sat, 04 May 2019 19:01:59 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1hMyyy-0001j2-LH for rsgb_lf_group@blacksheep.org; Sat, 04 May 2019 19:01:56 +0100 Received: from out2-22.antispamcloud.com ([185.201.17.22]) by relay1.thorcom.net with esmtps (TLSv1.2:DHE-RSA-AES256-GCM-SHA384:256) (Exim 4.92) (envelope-from ) id 1hMyyu-0008Ak-VD for rsgb_lf_group@blacksheep.org; Sat, 04 May 2019 19:01:55 +0100 Received: from [85.60.35.36] (helo=servigilant.vigilant.es) by mx63.antispamcloud.com with esmtpsa (TLSv1:ECDHE-RSA-AES128-SHA:128) (Exim 4.89) (envelope-from ) id 1hMyyk-000CZ7-Pf for rsgb_lf_group@blacksheep.org; Sat, 04 May 2019 20:01:50 +0200 Received: from servigilant.vigilant.local ([fe80::c40d:8140:d722:5448]) by servigilant.vigilant.local ([fe80::c40d:8140:d722:5448%13]) with mapi id 14.03.0123.003; Sat, 4 May 2019 20:01:21 +0200 From: =?iso-8859-1?Q?VIGILANT_Luis_Fern=E1ndez?= To: "rsgb_lf_group@blacksheep.org" Thread-Topic: Experiences with a symmetrical vertical antenna on ELF/VLF Thread-Index: AdUCS5lZ8/4nDetvQ+6juR+6kP0QegAV1YyA Date: Sat, 4 May 2019 18:01:21 +0000 Message-ID: <6DB8451D7F3D3947A5918808A59621EA315832CB@servigilant.vigilant.local> References: <000e01d5024b$ec8416e0$c58c44a0$@asamnet.net> In-Reply-To: <000e01d5024b$ec8416e0$c58c44a0$@asamnet.net> Accept-Language: es-ES, en-US Content-Language: es-ES X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [144.178.132.12] MIME-Version: 1.0 X-Originating-IP: 85.60.35.36 X-MailAssure-Domain: vigilant.es X-MailAssure-Username: smtpsolarwinds Authentication-Results: antispamcloud.com; auth=pass (login) smtp.auth=smtpsolarwinds@vigilant.es X-MailAssure-Outgoing-Class: ham X-MailAssure-Outgoing-Evidence: Combined (0.31) X-Recommended-Action: accept X-Filter-ID: Mvzo4OR0dZXEDF/gcnlw0R4iIUvzjp5U0k+OHPPhRGapSDasLI4SayDByyq9LIhV69bO2oHyUoIo np12V5s7EETNWdUk1Ol2OGx3IfrIJKywOmJyM1qr8uRnWBrbSAGDJiPq8PmJuu7YOC8gdYyWscQz 4E/a7yDKGr49b/XGOm3nx8yeplRO3sLIqUlSH7OGRXnoxEjDd+Ff3pODQQilCJOIWFXUh+IpRF9t B9BlKGgBHBI4gTdwLPAZxdZObNoPmdySlZou9qHIGOZDEEo7OzOxewfh+AToIgAT6Yh4WSGDvVX6 jh0QBzjU5KMlnMqWXrQ6GkQoCLjZMitGM4zg4Ibl8No+pc3p1d90RkK3aiDGDghetEKbzrU+L8So LvgNycHnsYer4OzPCXe4OBCby+KCUUWqL0iVrj5ef6TkNpwGoarYONiDEFwv3v7YX5nobNOVnm/J ychDLS8cIZ2IpwxaypTXO6jSpqZyGPXfHDgLsQHkL5RPGuzmw6+zutno8iFLSvDIs///tQA+tSPL DnBRUhnJ4HlObtOsztNS3ejY5Qx4fJOk03R5fJtf/Dv/y3CoGmC5/WNqvRNB6xg/o7t50LAMcmfO hquKdjiS5dv4OK/Ytv2FwNaJodHIYVcOvlHAzywm7237koE/GazA8m2ltCpWyO6HQmWtbGwhy4F2 SSek70lewMJaa8MVLVX2HarGgIw4zrf2iwoQCH7FRhMqABCuK7DVpOJr7QXPUVGZzmbQtiTag4sB GQMHK+9PtOdXzefR82dzqUoJLGrqo2D5z7JtfIyiqK+XaskaH/6aUj7laL7nE2jlSZjbliuzvEIH cCE5e1x6LTD5Z8JTeH6m+UeFXprlCOm3BAEbJtBy1JXA5vWEYgRGncynW+3pl/CWx0jTWEOOctFS 8sxEslgg2CFD24dqF46Fjf/yXu3/asDO0V6SUvEY03codo+QchvY9bjOWQH+aKYh6nwnGIGfI/0b m9zMbLTDLNbsdEnNQ2+UaDjnre7I7StgG/sn X-Report-Abuse-To: spam@quarantine3.antispamcloud.com X-Spam-Score: 0.8 (/) X-Spam-Report: Spam detection software, running on the system "relay1.thorcom.net", has NOT identified this incoming email as spam. The original message has been attached to this so you can view it or label similar future email. If you have any questions, see @@CONTACT_ADDRESS@@ for details. Content preview: Hi Bernd Thank you for sharing your experiences. www.vlf.it is really a mine of valuable information A couple of questions about the electronics for this antenna Do you feed the circuits with a battery or power supply ? Do you instaled the 50Hz notch circuit and the 100KHz low pass filter ? As you ha [...] Content analysis details: (0.8 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.7 RCVD_IN_DNSWL_LOW RBL: Sender listed at http://www.dnswl.org/, low trust [185.201.17.22 listed in list.dnswl.org] -0.0 SPF_PASS SPF: sender matches SPF record 0.0 HTML_MESSAGE BODY: HTML included in message 1.5 RCVD_IN_SORBS_WEB RBL: SORBS: sender is an abusable web server [85.60.35.36 listed in dnsbl.sorbs.net] X-Scan-Signature: 7ee575a0a6578bbbbe5ea7af32688fd5 Subject: LF: Re: Experiences with a symmetrical vertical antenna on ELF/VLF Content-Type: multipart/alternative; boundary="_000_6DB8451D7F3D3947A5918808A59621EA315832CBservigilantvigi_" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.8 required=5.0 tests=HTML_30_40,HTML_MESSAGE, TO_ADDRESS_EQ_REAL autolearn=no version=2.63 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 --_000_6DB8451D7F3D3947A5918808A59621EA315832CBservigilantvigi_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hi Bernd Thank you for sharing your experiences. www.vlf.it is re= ally a mine of valuable information A couple of questions about the electronics for this antenna Do you feed the circuits with a battery or power supply ? Do you instaled the 50Hz notch circuit and the 100KHz low pass filter ? As you have been receiving VLF y presume you didn't 73 de Luis EA5DOM ________________________________ De: owner-rsgb_lf_group@blacksheep.org [owner-rsgb_lf_group@blacksheep.org]= en nombre de Bernhard Wiesgickl [bernhard.wiesgickl@asamnet.net] Enviado: s=E1bado, 4 de mayo de 2019 9:35 Para: rsgb_lf_group@blacksheep.org Asunto: LF: Experiences with a symmetrical vertical antenna on ELF/VLF Hello VLF-/ELF-enthusiasts, I built a slightly modified symmetrical vertical antenna which is described= from IW5BHY in http://www.vlf.it/immagine/minimal_E.html and I want let yo= u to know my experience with this antenna. First we installed this antenna at DL0AO. DL0AO is in a rural area in the w= ood. But the result was very disappointing! Already light wind increased th= e noise by 20 to 30 dB from 5 Hz to 2 kHz and on frequencies around 20 kHz several phantom signals were present= when wind was blowing. Even during quiet periods no Schumann-resonances we= re visible and ZEVS was very weak and the S/N of the submarine-TXs around 20 kHz was comp= arable to our ground-loops or E-field antenna (again: when there was no win= d). Presumably the surrounding high trees in 20 to 100 m distance and (or?) the= wire-mesh fence with a very rusty barbed wire on top, only 20 m away from = the antenna, was the reason. So I installed the antenna in my garden at home. With my small T-Marconi-an= tenna the noise level is quite high at home and I did not expect too much = advantage with the symmetrical vertical antenna. But surprise, surprise! The S/N of t= he submarine-TXs is up to 10 dB better compared to the small marconi, ZEVS = is good visible, the Schumann-Resonances are clearly visible (both not visible with the marc= oni-antenna) and a weak test-signal on 8.270 kHz from DF6NM was 15 db above= the noise. Compared to our antennas at DL0AO the S/N of the submarine-TXs are only 3 t= o 5 dB lower, ZEVS and Schumann-resonances are comparable between home and = DL0AO. Summary: The symmetrical vertical antenna is much more sensitive to environmental ef= fects than a vertical working against ground. But when you use an antenna working not against ground in areas where the g= round is noisy (in my case urban area, single family houses, no industry, n= o electrified train) satisfactorily reception of ELF- and VLF-signals is possible with a symmetr= ical vertical dipole. Bernd, DF9RB (one sysop of the grabbers at DL0AO) --_000_6DB8451D7F3D3947A5918808A59621EA315832CBservigilantvigi_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Hi Bernd

Thank you for sharing your experiences. www.vlf.it is really a mine of valuable information

A couple of questions about the electronics for this antenna
Do you feed the circuits with a battery or power supply ?
Do you instaled the 50Hz notch circuit and the 100KHz low pass filter = ?
As you have been receiving VLF y presume you didn't

73 de Luis
EA5DOM

De: owner-rsgb_lf_group@blacksheep.org [o= wner-rsgb_lf_group@blacksheep.org] en nombre de Bernhard Wiesgickl [bernhar= d.wiesgickl@asamnet.net]
Enviado: s=E1bado, 4 de mayo de 2019 9:35
Para: rsgb_lf_group@blacksheep.org
Asunto: LF: Experiences with a symmetrical vertical antenna on ELF/V= LF

Hello VLF-/ELF-enthusiasts,

 

I built a slightly modified sym= metrical vertical antenna which is described from IW5BHY in http://www.vlf.it/immagine/mi= nimal_E.html and I want let you to know

my experience with this antenna= .

First we installed this antenna= at DL0AO. DL0AO is in a rural area in the wood. But the result was very di= sappointing! Already light wind increased the noise by 20 to 30 dB from 5 H= z to

2 kHz and on frequencies around= 20 kHz several phantom signals were present when wind was blowing. Even du= ring quiet periods no Schumann-resonances were visible and

ZEVS was very weak and the S/N = of the submarine-TXs around 20 kHz  was comparable to our ground-loops= or E-field antenna (again: when there was no wind).

Presumably the surrounding high= trees in 20 to 100 m distance and (or?) the wire-mesh fence with a very ru= sty barbed wire on top, only 20 m away from the

antenna, was the reason.=

So I installed the antenna in m= y garden at home. With my small T-Marconi-antenna  the noise level is = quite high at home and I did not expect too much advantage

with the symmetrical vertical a= ntenna. But surprise, surprise! The S/N of the submarine-TXs is up to 10 dB= better compared to the small marconi, ZEVS is good visible,

the Schumann-Resonances are cle= arly visible (both not visible with the marconi-antenna) and a weak test-si= gnal on 8.270 kHz from DF6NM was 15 db above the noise.

Compared to our antennas at DL0= AO the S/N of the submarine-TXs are only 3 to 5 dB lower, ZEVS and Schumann= -resonances are comparable between home and DL0AO.

 

Summary:

T= he symmetrical vertical antenna is much more sensitive to environmental eff= ects than a vertical working against ground.

B= ut when you use an antenna working not against ground in areas where the gr= ound is noisy (in my case urban area, single family houses, no industry, no= electrified train)

satisfactorily reception of ELF= - and VLF-signals is possible with a symmetrical vertical dipole.

 

 

Bernd, DF9RB (one sysop of the = grabbers at DL0AO)

 

 

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