Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-dd04.r1000.mx.aol.com (Internet Inbound) with ESMTP id 708AB38000143; Sun, 1 Apr 2012 14:29:53 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1SEPVy-000614-5c for rs_out_1@blacksheep.org; Sun, 01 Apr 2012 19:28:34 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1SEPVx-00060v-C4 for rsgb_lf_group@blacksheep.org; Sun, 01 Apr 2012 19:28:33 +0100 Received: from cpsmtpb-ews01.kpnxchange.com ([213.75.39.4]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1SEPVw-0007eC-5A for rsgb_lf_group@blacksheep.org; Sun, 01 Apr 2012 19:28:33 +0100 Received: from cpsps-ews25.kpnxchange.com ([10.94.84.191]) by cpsmtpb-ews01.kpnxchange.com with Microsoft SMTPSVC(6.0.3790.4675); Sun, 1 Apr 2012 20:28:26 +0200 Received: from CPSMTPM-CMT101.kpnxchange.com ([195.121.3.17]) by cpsps-ews25.kpnxchange.com with Microsoft SMTPSVC(7.5.7601.17514); Sun, 1 Apr 2012 20:28:26 +0200 Received: from acer ([81.204.139.159]) by CPSMTPM-CMT101.kpnxchange.com with Microsoft SMTPSVC(7.0.6002.18264); Sun, 1 Apr 2012 20:28:26 +0200 Message-ID: <1BC2BBBA70C148B58E16F4FD176235C3@acer> From: "henny van elst" To: References: <4F7899DA.8050400@iup.uni-heidelberg.de> Date: Sun, 1 Apr 2012 20:26:00 +0200 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.5931 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.6109 X-OriginalArrivalTime: 01 Apr 2012 18:28:26.0463 (UTC) FILETIME=[3A83A6F0:01CD1035] X-RcptDomain: blacksheep.org X-Spam-Score: 3.4 (+++) X-Spam-Report: autolearn=disabled,FORGED_MUA_OUTLOOK=3.36,HTML_MESSAGE=0.001 Subject: Re: LF: 8.970Khz Content-Type: multipart/alternative; boundary="----=_NextPart_000_0007_01CD1045.A71017D0" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: ** X-Spam-Status: No, hits=2.1 required=5.0 tests=FORGED_MUA_OUTLOOK,HTML_20_30, 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: 0:2:483146848:93952408 x-aol-sid: 3039ac1d40904f789ea04424 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none This is a multi-part message in MIME format. ------=_NextPart_000_0007_01CD1045.A71017D0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hello Stefan,LF I will be on air from 09.00 till 15.00 Utc. henny pa3cpm best 73's ----- Original Message -----=20 From: Stefan Sch=E4fer=20 To: rsgb_lf_group@blacksheep.org=20 Cc: Uwe Jannsen=20 Sent: Sunday, April 01, 2012 8:09 PM Subject: Re: LF: 8.970Khz Hi Henny, Uwe, VLF,=20 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.=20 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:=20 Gm LF, the tx is on,8.970 Khz 450 mA antenna current henny pa3cpm 73's ------=_NextPart_000_0007_01CD1045.A71017D0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Hello Stefan,LF
I will be on air from 09.00 till  = 15.00=20 Utc.
 
henny pa3cpm
best 73's
----- Original Message -----
From:=20 Stefan = Sch=E4fer
Sent: Sunday, April 01, 2012 = 8:09=20 PM
Subject: Re: LF: 8.970Khz

Hi Henny, Uwe, VLF,

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

Now i want to try if i can = receive your=20 transmission Henny and Uwe, if you have the chance to transmit = tomorrow=20 between 8 UTC until the late afternoon? The longer the better. It is = exciting=20 how clean the band looks there and i really want to have a permanent = remote=20 link to my grabber PC. These are the pre tests...

Will you be = on air=20 tomorrow? :-)

As an additional test i want to add a switch into = my=20 antenna which allows to disable the high pass RC part. I will then see = the=20 difference and who knows, maybe i can receive the ZEVS on 82 Hz. At = least i=20 want to do a recording of  > 1 hour. That is such a = fascinating WX=20 here! I love it.

Also i want to do a new VLF transmission test = with=20 the small LOPT transformer from an old TV. It became wet during the = last test=20 and then i had a flash over. Maybe it is damaged but maybe not. If = not, i will=20 transmit at 8972 Hz or so and try to decode a WOLF10 signal on = VLF.

I=20 also ordered some audio transformers in different winding ratios. A = galvanic=20 decoupling, optimal matching to the soundcard, first using a 4:1 and = then a=20 1:10 xfmr with a local ground between the transformers may help to get = a lower=20 noise floor on my 2 orthogonal VLF loops which generate the signals = for the=20 CDF VLF grabber at http://www.iup.uni-heidelberg.de/schaefer_vlf/DK7FC_VLF_Grabber2.ht= ml

73,=20 Stefan/DK7FC



Am 01.04.2012 10:34, schrieb henny van = elst:=20
Gm LF,
the tx is on,8.970 Khz 450 mA = antenna=20 current
henny pa3cpm
73's
------=_NextPart_000_0007_01CD1045.A71017D0--