Return-Path: Received: from mtain-dj01.r1000.mx.aol.com (mtain-dj01.r1000.mail.aol.com [172.19.187.137]) by air-dd06.mail.aol.com (v129.10) with ESMTP id MAILINDD063-865c4da93bf23ae; Sat, 16 Apr 2011 02:49:22 -0400 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-dj01.r1000.mx.aol.com (Internet Inbound) with ESMTP id E609838000084; Sat, 16 Apr 2011 02:49:20 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1QAzJ8-0004L6-5z for rs_out_1@blacksheep.org; Sat, 16 Apr 2011 07:48:38 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1QAzJ7-0004Kx-LN for rsgb_lf_group@blacksheep.org; Sat, 16 Apr 2011 07:48:37 +0100 Received: from bay0-omc1-s1.bay0.hotmail.com ([65.54.190.12]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1QAzJ6-0007CA-6s for rsgb_lf_group@blacksheep.org; Sat, 16 Apr 2011 07:48:37 +0100 Received: from BAY154-W38 ([65.54.190.61]) by bay0-omc1-s1.bay0.hotmail.com with Microsoft SMTPSVC(6.0.3790.4675); Fri, 15 Apr 2011 23:48:28 -0700 Message-ID: X-Originating-IP: [81.200.63.88] From: Lubos OK2BVG To: _RSGB_LF Date: Sat, 16 Apr 2011 08:48:28 +0200 Importance: Normal In-Reply-To: <4DA89BBA.1010106@iup.uni-heidelberg.de> References: <4DA89BBA.1010106@iup.uni-heidelberg.de> MIME-Version: 1.0 X-OriginalArrivalTime: 16 Apr 2011 06:48:28.0429 (UTC) FILETIME=[4ABDFBD0:01CBFC02] X-Spam-Score: 0.9 (/) X-Spam-Report: autolearn=disabled,HTML_10_20=0.945,HTML_MESSAGE=0.001 Content-Type: multipart/alternative; boundary="_3b39d204-1c16-4e14-88b9-b941a62582d2_" Subject: RE: LF: VLF grabber at DK7FC X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.0 required=5.0 tests=FORGED_HOTMAIL_RCVD, 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-sid: 3039cdbc9d054da93bf0433b X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none X-Mailer: Unknown (No Version) --_3b39d204-1c16-4e14-88b9-b941a62582d2_ Content-Type: text/plain; charset="iso-8859-2" Content-Transfer-Encoding: quoted-printable Hello Stefan, thanks for your grabber very much! I use it every day.It was= exciting experience to see my own signal on this one. Keep your grabber= up as long as possible!=20 73! Lubos, OK2BVG ******************************* > Date: Fri, 15 Apr 2011 21:25:46 +0200 > From: Stefan.Schaefer@iup.uni-heidelberg.de > To: rsgb_lf_group@blacksheep.org > Subject: LF: VLF grabber at DK7FC >=20 > Dear group, >=20 > Today, my VLF grabber at=20 > http://www.iup.uni-heidelberg.de/schaefer_vlf/DK7FC_VLF_Grabber.html=20 > becomes 1 year old :-) >=20 > I've never thought that it will be so sensible and will see so many=20 > stations, even with usual LF home antennas and moderate power. The=20 > circuit of the active antenna was modified several times. Also Spectrum= =20 > Lab by DL4YHF plays a dominant role here. By improving the noise=20 > reduction settings, we won another 2 dB (about). >=20 > First it was a idea of Paul Nicholson to choose a compromise of a long= =20 > (enough) "carrier" and sending informations. So i came to the good old= =20 > "DFCW-600". Since my signal was strong out of 40km distance i wanted to= =20 > add a DFCW-60 and DFCW-3 window, to monitor my own signal in faster=20 > modes. For test purposes i arranged a DFCW-6000 window. The idea was=20 > that someone who prepares to be visible in 600 could see his signal in= =20 > 6000 and then knowns how many dBs are still missed. OE5ODL for example= =20 > showed often that he is visible in 6000 but just sometimes, with the=20 > balloon, in 600. > Now we arrived at even 60000 (=3D 47 uHz). Stations like DJ8WX became=20 > regularly visible. But there seems to be a limit, given by the VFO=20 > accuracy, time and phase instabilities at higher distances. > The Alpha stations are a perfect reference and since having a stable RX= =20 > is essential and there were often questions about the availability of=20 > RSDN-20, i added the Alpha window, not only to check if my GPS module is= =20 > still locked. > The wideband window gives a good overview of the current QRN situation,= =20 > solar activities and the presence or absence of military MSK stations or= =20 > fauls of the rig, that shows in a sudden loss of sensitivity. >=20 > Thank you for the interest of 7314 visitors out of 60 countries (34 of= =20 > 51 US states) and 198665 pageviews so far :-) I'll keep the service=20 > running as long as possible, and this may be a looong time! > Stations who appeared there so far were: DF6NM, OE5ODL, OE3GHB, DJ8WX,= =20 > OK2BVG, DK7FC and a small sign of PA3CPM > I hope to see more stations soon! >=20 >=20 > 73, Stefan/DK7FC >=20 =3D --_3b39d204-1c16-4e14-88b9-b941a62582d2_ Content-Type: text/html; charset="iso-8859-2" Content-Transfer-Encoding: quoted-printable Hello Stefan, 
thanks for your grabber very much! I use it every= day.
It was exciting experience to see my own signal on this on= e. 
Keep your grabber up as long as possible! 

73!

Lubos, OK2BVG
*******************************
> Date: Fri, 15 Apr 2011= 21:25:46 +0200
> From: Stefan.Schaefer@iup.uni-heidelberg.de
>= ; To: rsgb_lf_group@blacksheep.org
> Subject: LF: VLF grabber at DK7= FC
>
> Dear group,
>
> Today, my VLF grabber at=
> http://www.iup.uni-heidelberg.de/schaefer_vlf/DK7FC_VLF_Grabber.= html
> becomes 1 year old :-)
>
> I've never thought= that it will be so sensible and will see so many
> stations, even= with usual LF home antennas and moderate power. The
> circuit of= the active antenna was modified several times. Also Spectrum
> Lab= by DL4YHF plays a dominant role here. By improving the noise
> red= uction settings, we won another 2 dB (about).
>
> First it wa= s a idea of Paul Nicholson to choose a compromise of a long
> (enou= gh) "carrier" and sending informations. So i came to the good old
>= "DFCW-600". Since my signal was strong out of 40km distance i wanted to=
> add a DFCW-60 and DFCW-3 window, to monitor my own signal in fas= ter
> modes. For test purposes i arranged a DFCW-6000 window. The= idea was
> that someone who prepares to be visible in 600 could se= e his signal in
> 6000 and then knowns how many dBs are still misse= d. OE5ODL for example
> showed often that he is visible in 6000 but= just sometimes, with the
> balloon, in 600.
> Now we arrived= at even 60000 (=3D 47 uHz). Stations like DJ8WX became
> regularly= visible. But there seems to be a limit, given by the VFO
> accurac= y, time and phase instabilities at higher distances.
> The Alpha sta= tions are a perfect reference and since having a stable RX
> is ess= ential and there were often questions about the availability of
>= RSDN-20, i added the Alpha window, not only to check if my GPS module is=
> still locked.
> The wideband window gives a good overview= of the current QRN situation,
> solar activities and the presence= or absence of military MSK stations or
> fauls of the rig, that sh= ows in a sudden loss of sensitivity.
>
> Thank you for the in= terest of 7314 visitors out of 60 countries (34 of
> 51 US states)= and 198665 pageviews so far :-) I'll keep the service
> running as= long as possible, and this may be a looong time!
> Stations who app= eared there so far were: DF6NM, OE5ODL, OE3GHB, DJ8WX,
> OK2BVG, DK= 7FC and a small sign of PA3CPM
> I hope to see more stations soon!>
>
> 73, Stefan/DK7FC
>
= =3D --_3b39d204-1c16-4e14-88b9-b941a62582d2_--