Return-Path: Received: from mtain-dd02.r1000.mx.aol.com (mtain-dd02.r1000.mx.aol.com [172.29.64.142]) by air-dc01.mail.aol.com (v129.4) with ESMTP id MAILINDC013-864d4c7a8fe62e7; Sun, 29 Aug 2010 12:50:46 -0400 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mtain-dd02.r1000.mx.aol.com (Internet Inbound) with ESMTP id 7A438380000B2; Sun, 29 Aug 2010 12:50:44 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Opl4H-00057F-Iy for rs_out_1@blacksheep.org; Sun, 29 Aug 2010 17:49:17 +0100 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Opl4G-000576-Rr for rsgb_lf_group@blacksheep.org; Sun, 29 Aug 2010 17:49:16 +0100 Received: from mail-bw0-f43.google.com ([209.85.214.43]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1Opl4F-0005Z5-3I for rsgb_lf_group@blacksheep.org; Sun, 29 Aug 2010 17:49:16 +0100 Received: by bwz16 with SMTP id 16so3780032bwz.16 for ; Sun, 29 Aug 2010 09:49:14 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:received:received:in-reply-to :references:date:message-id:subject:from:to:content-type; bh=FT/4E8AVAy54fr5YLeYeed+lhAAAhUORwHefYJb7fIc=; b=mvdPgIMx+nD/9U7g+4FnWGX3ZS3izAmRflGprtCjF5g6r7Keb+h+cn10EGfZV66HKB qeIt49UxqWtdDMWOsdmsmZs/mVFS1NWRXVrylYINw5neTNZXaLs9wLHTxIzb0wDQjMJG aoopoKDgMpI4/lwWx9N6H+LDpWTcZDBt1OX5E= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type; b=bX7Fu2Eeh5Or13FcB7S1bjgSYG0VUaw4kvNtAHX8cAW7Er21ZLp+ZMJzjUHvlStmnU GNHCX8xEWLE6UMnOsrtK7X1WAnGfAdqsV6EWhub86Cmi81//nkxulqFx44VyHH3pZH7P AuV5GSsIqw82WHciPpARyfTA2gQpQIw7TdUd4= MIME-Version: 1.0 Received: by 10.204.82.200 with SMTP id c8mr2399480bkl.102.1283100554275; Sun, 29 Aug 2010 09:49:14 -0700 (PDT) Received: by 10.204.136.67 with HTTP; Sun, 29 Aug 2010 09:49:14 -0700 (PDT) In-Reply-To: <4C7A56EA.8010901@iup.uni-heidelberg.de> References: <4C77BCB1.4060608@iup.uni-heidelberg.de> <0B537E764BCB476F8F0CC7168686E14D@Black> <335984238.20100828130950@web.de> <4C7971ED.8030006@iup.uni-heidelberg.de> <4C7A56EA.8010901@iup.uni-heidelberg.de> Date: Sun, 29 Aug 2010 17:49:14 +0100 Message-ID: From: Roger Lapthorn To: rsgb_lf_group@blacksheep.org DomainKey-Status: good (testing) X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,HTML_MESSAGE=0.001 Subject: Re: VLF: Re: Transmitting 250W at 8970 Hz on a 600m spaced earth antenna Content-Type: multipart/alternative; boundary=0016e6dab3d9bfaa57048ef920d5 X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.5 required=5.0 tests=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-AUTHENTICATION: mail_rly_antispam_dkim-d236.2 ; domain : gmail.com DKIM : pass x-aol-sid: 3039ac1d408e4c7a8fe40d52 X-AOL-IP: 193.82.116.20 X-AOL-SPF: domain : blacksheep.org SPF : none X-Mailer: Unknown (No Version) --0016e6dab3d9bfaa57048ef920d5 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Thanks Stefan. I'll update the sub-9kHz page and table with these results later. 73s Roger G3XBM 2010/8/29 Stefan Sch=E4fer > Hi Roger, > > As written below, the distance was 49,6 km. The signal was detected by > Michael Oexner (no callsign) in JN49BF ,who sent a mail with a screensho= t > yesterday. The reception was a single dash, that absolutely matches time= and > frequency (compared to my grabber that is tracked by GQD (22,1 kHz)). As > usual, a "message" such as "73" or "cu" or "fb" or something like that= is > preferable, so we will do further tests. It is no problem to do those te= sts > since the antenna can just be connected, even during wind and rain :-) > > BTW, if my signal was 35 dB above noise in 5 km at 250 W, i could see my > signal even with 2,5 W :-) > It seems, the QRN comes down below -90 dB in the morning hours on many > days, seems to be nothing special in the "DX" period :-) > > > Eventually i will try to receive my own signal at the QTH of my parents, > about 35 km distanced, directly orientated to the antenna. > > Any questions else? > > > 73, Stefan/DK7FC > > Am 29.08.2010 09:15, schrieb Roger Lapthorn: > > Hi Stefan, > > Please summarise Saturday's tests with the earth electrode antenna on > 8.97kHz. The above emails leave me a bit confused about who saw the sign= al > (?) and at what distance. > > I believe you are going to repeat the tests to get a better confirmation= of > the result? > > 73s > Roger G3XBM > > 2010/8/28 Stefan Sch=E4fer > >> Hi Michael, Markus, VLF, >> >> Well, time and frequency absolutely corresponds with my transmission so= i >> would say it is a positive reception. Anyway i think we should do the= test >> again, sending a message or a some charakters to better confirm the >> reception. Maybe DD7PC is QRV in DFCW-600 (abt 4 mHz) again the next ti= me? >> >> The distance of the todays experiment is: 49.6 km. >> >> My antenna bearing is 9/189 deg, the QTH of Michael is in an angle of= 54 >> deg to this antenna. So, not an ideal orientation, if the antenna acts= like >> a loop, but a weak reception anyway. The picture shows the locations of= TX >> and RX. The yellow line is the distance, the white line is the antenna >> orientation. TX power was 250 W, just like yesterday. Antenna current= will >> be measured in the next experiment... >> >> Tnx to Michael for the effort to catch that signal (Markus as well). >> >> 73, Stefan/DK7FC >> >> PS: Markus, tnx for the screenshots of the DFCW-3 message :-) >> >> Am 28.08.2010 13:09, schrieb Michael Oexner: >> >> Hi Markus, Stefan and list, >>> >>> >>> >>> >>>> Since 10:25, Stefan is on air again with his ground loop. Signals >>>> on his own grabber are even better than yesterday, perhaps due to >>>> somewhat lower QRN. I am also looking here but don't have much hope, >>>> as the TX antenna is N-S oriented and Nuernberg is 180 km due east. >>>> Good luck, >>>> Markus (DF6NM) >>>> >>>> >>> Have a close look at the enclosed screenshot... what would you say? >>> >>> There is a weakish line on 8969.735 >>> >>> >>> >>> >> > > > -- > http://g3xbm-qrp.blogspot.com/ > http://www.g3xbm.co.uk > http://www.youtube.com/user/g3xbm > G3XBM GQRP 1678 ISWL G11088 > > --=20 http://g3xbm-qrp.blogspot.com/ http://www.g3xbm.co.uk http://www.youtube.com/user/g3xbm G3XBM GQRP 1678 ISWL G11088 --0016e6dab3d9bfaa57048ef920d5 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Thanks Stefan. I'll update the sub-9kHz page and table with these resu= lts later.

73s
Roger G3XBM

201= 0/8/29 Stefan Sch=E4fer <schaefer@iup.uni-heidelberg.de>
=20
Hi Roger,

As written below, the distance was 49,6 km. The signal was detected by Michael Oexner (no callsign) in JN49BF ,who sent a mail with a screenshot yesterday. The reception was a single dash, that absolutely matches time and frequency (compared to my grabber that is tracked by GQD (22,1 kHz)). As usual, a "message" such as "73" or= "cu" or "fb" or something like that is preferable, so we will do further tests. It is no problem to do those tests since the antenna can just be connected, even during wind and rain :-)

BTW, if my signal was 35 dB above noise in 5 km at 250 W, i could see my signal even with 2,5 W :-)
It seems, the QRN comes down below -90 dB in the morning hours on many days, seems to be nothing special in the "DX" period :-)


Eventually i will try to receive my own signal at the QTH of my parents, about 35 km distanced, directly orientated to the antenna.

Any questions else?


73, Stefan/DK7FC

Am 29.08.2010 09:15, schrieb Roger Lapthorn:
Hi Stefan,

Please summarise Saturday's tests with the earth electrode antenna on 8.97kHz. The above emails leave me a bit confused about who saw the signal (?) and at what distance.

I believe you are going to repeat the tests to get a better confirmation of the result?

73s
Roger G3XBM

2010/8/28 Stefan Sch=E4fer = <sc= haefer@iup.uni-heidelberg.de>
Hi Michael, Markus, VLF,

Well, time and frequency absolutely corresponds with my transmission so i would say it is a positive reception. Anyway i think we should do the test again, sending a message or a some charakters to better confirm the reception. Maybe DD7PC is QRV in DFCW-600 (abt 4 mHz) again the next time?

The distance of the todays experiment is: 49.6 km.

My antenna bearing is 9/189 deg, the QTH of Michael is in an angle of 54 deg to this antenna. So, not an ideal orientation, if the antenna acts like a loop, but a weak reception anyway. The picture shows the locations of TX and RX. The yellow line is the distance, the white line is the antenna orientation. TX power was 250 W, just like yesterday. Antenna current will be measured in the next experiment...

Tnx to Michael for the effort to catch that signal (Markus as well).

73, Stefan/DK7FC

PS: Markus, tnx for the screenshots of the DFCW-3 message :-)

Am 28.08.2010 13:09, schrieb Michael Oexner:

Hi Markus, Stefan and list,


=A0
Since 10:25, Stefan is on air again with his ground loop. Signals
on his own grabber are even better than yesterday, perhaps due to
somewhat lower QRN. I am also looking here but don't have much hope, as the TX antenna is N-S oriented and Nuernberg is 180 km due east.
=A0Good luck,
Markus (DF6NM)
=A0 =A0
Have a close look at the enclosed screenshot... what would you say?

There is a weakish line on 8969.735


=A0



--
http://g3xb= m-qrp.blogspot.com/
http://www.g3xbm.co= .uk
http://w= ww.youtube.com/user/g3xbm
G3XBM=A0=A0 GQRP 1678=A0=A0=A0 ISWL G11088



--
http://g3xbm-qrp.blogspot.com/<= br>http://www.g3xbm.c= o.uk
http://www= .youtube.com/user/g3xbm
G3XBM=A0=A0 GQRP 1678=A0=A0=A0 ISWL G11088<= br> --0016e6dab3d9bfaa57048ef920d5--