Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-da03.r1000.mx.aol.com (Internet Inbound) with ESMTP id D7D513800009F; Sun, 1 Apr 2012 15:57:20 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1SEQt6-0006YK-PX for rs_out_1@blacksheep.org; Sun, 01 Apr 2012 20:56:32 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1SEQt6-0006YB-83 for rsgb_lf_group@blacksheep.org; Sun, 01 Apr 2012 20:56:32 +0100 Received: from relay.uni-heidelberg.de ([129.206.100.212]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1SEQt5-0008Do-2J for rsgb_lf_group@blacksheep.org; Sun, 01 Apr 2012 20:56:32 +0100 Received: from freitag.iup.uni-heidelberg.de (freitag.iup.uni-heidelberg.de [129.206.29.204]) by relay.uni-heidelberg.de (8.14.1/8.14.1) with ESMTP id q31JuTxq018963 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO) for ; Sun, 1 Apr 2012 21:56:29 +0200 Received: from [129.206.22.206] (pc206.iup.uni-heidelberg.de [129.206.22.206]) by freitag.iup.uni-heidelberg.de (8.12.11.20060308/8.11.2) with ESMTP id q31JuTIY026935 for ; Sun, 1 Apr 2012 21:56:29 +0200 Message-ID: <4F78B2D0.6090906@iup.uni-heidelberg.de> Date: Sun, 01 Apr 2012 21:56:00 +0200 From: =?ISO-8859-1?Q?Stefan_Sch=E4fer?= 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: <4F7899DA.8050400@iup.uni-heidelberg.de> <1BC2BBBA70C148B58E16F4FD176235C3@acer> In-Reply-To: <1BC2BBBA70C148B58E16F4FD176235C3@acer> X-Spam-Score: 1.4 (+) X-Spam-Report: autolearn=disabled,HTML_MESSAGE=0.001,RATWARE_GECKO_BUILD=1.426 Subject: Re: LF: 8.970Khz Content-Type: multipart/alternative; boundary="------------080100080101010409030007" 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 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 x-aol-global-disposition: G X-AOL-SCOLL-SCORE: 0:2:489587872:93952408 x-aol-sid: 3039ac1d404b4f78b3201691 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none This is a multi-part message in MIME format. --------------080100080101010409030007 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: quoted-printable X-MIME-Autoconverted: from 8bit to quoted-printable by relay.uni-heidelberg.de id q31JuTxq018963 Thanks Henny, i will report. 73, Stefan Am 01.04.2012 20:26, schrieb henny van elst: > Hello Stefan,LF > I will be on air from 09.00 till 15.00 Utc. > henny pa3cpm > best 73's > > ----- Original Message ----- > *From:* Stefan Sch=E4fer > *To:* rsgb_lf_group@blacksheep.org > > *Cc:* Uwe Jannsen > *Sent:* Sunday, April 01, 2012 8:09 PM > *Subject:* Re: LF: 8.970Khz > > Hi Henny, Uwe, VLF, > > Yesterday i did some tests with an active E field antenna in the > forest. I used my normal VLF receive antenna design. First i > didn't expect much since it is said that there are little chances > to receive anything with an E field antenna in the forest at VLF > but i got excellent results! DHO38 easily reached 50 dN S/N. The > antenna was hung up 2m above the ground to a branch of a > 20m > tree. A small 12V battery was used for the supply and i took a > recording of about 10 minutes. In a previous test i had QRM coming > from the netbook's screen but yesterday i added a single copper > earth rod, 20 cm stuck into the soil. Now the QRM was completely > gone and the levels rised 1 or 2 dB. > > Now i want to try if i can receive your transmission Henny and > Uwe, if you have the chance to transmit tomorrow between 8 UTC > until the late afternoon? The longer the better. It is exciting > how clean the band looks there and i really want to have a > permanent remote link to my grabber PC. These are the pre tests... > > Will you be on air tomorrow? :-) > > As an additional test i want to add a switch into my antenna which > allows to disable the high pass RC part. I will then see the > difference and who knows, maybe i can receive the ZEVS on 82 Hz. > At least i want to do a recording of > 1 hour. That is such a > fascinating WX here! I love it. > > Also i want to do a new VLF transmission test with the small LOPT > transformer from an old TV. It became wet during the last test and > then i had a flash over. Maybe it is damaged but maybe not. If > not, i will transmit at 8972 Hz or so and try to decode a WOLF10 > signal on VLF. > > I also ordered some audio transformers in different winding > ratios. A galvanic decoupling, optimal matching to the soundcard, > first using a 4:1 and then a 1:10 xfmr with a local ground between > the transformers may help to get a lower noise floor on my 2 > orthogonal VLF loops which generate the signals for the CDF VLF > grabber at > http://www.iup.uni-heidelberg.de/schaefer_vlf/DK7FC_VLF_Grabber2.ht= ml > > 73, Stefan/DK7FC > > > > Am 01.04.2012 10:34, schrieb henny van elst: >> Gm LF, >> the tx is on,8.970 Khz 450 mA antenna current >> henny pa3cpm >> 73's > --------------080100080101010409030007 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Thanks Henny, i will report.

73, Stefan

Am 01.04.2012 20:26, schrieb henny van elst:
Hello Stefan,LF
I will be on air from 09.00 till  15.00 Utc.
 
henny pa3cpm
best 73's
----- Original Message -----
Sent: Sunday, April 01, 2012 8:09 PM
Subject: Re: LF: 8.970Khz

Hi Henny, Uwe, VLF,

Yesterday i did some tests with an active E field antenna in the forest. I used my normal VLF receive antenna design. First i didn't expect much since it is said that there are little chances to receive anything with an E field antenna in the forest at VLF but i got excellent results! DHO38 easily reached 50 dN S/N. The antenna was hung up 2m above the ground to a branch of a > 20m tree. A small 12V battery was used for the supply and i took a recording of about 10 minutes. In a previous test i had QRM coming from the netbook's screen but yesterday i added a single copper earth rod, 20 cm stuck into the soil. Now the QRM was completely gone and the levels rised 1 or 2 dB.

Now i want to try if i can receive your transmission Henny and Uwe, if you have the chance to transmit tomorrow between 8 UTC until the late afternoon? The longer the better. It is exciting how clean the band looks there and i really want to have a permanent remote link to my grabber PC. These are the pre tests...

Will you be on air tomorrow? :-)

As an additional test i want to add a switch into my antenna which allows to disable the high pass RC part. I will then see the difference and who knows, maybe i can receive the ZEVS on 82 Hz. At least i want to do a recording of  > 1 hour. That is such a fascinating WX here! I love it.

Also i want to do a new VLF transmission test with the small LOPT transformer from an old TV. It became wet during the last test and then i had a flash over. Maybe it is damaged but maybe not. If not, i will transmit at 8972 Hz or so and try to decode a WOLF10 signal on VLF.

I also ordered some audio transformers in different winding ratios. A galvanic decoupling, optimal matching to the soundcard, first using a 4:1 and then a 1:10 xfmr with a local ground between the transformers may help to get a lower noise floor on my 2 orthogonal VLF loops which generate the signals for the CDF VLF grabber at http://www.iup.uni-heidelberg.de/schaefer_vlf/DK7FC_VLF_Grabber2.html

73, Stefan/DK7FC



Am 01.04.2012 10:34, schrieb henny van elst:
Gm LF,
the tx is on,8.970 Khz 450 mA antenna current
henny pa3cpm
73's
--------------080100080101010409030007--