Return-Path: Received: from mtain-mk06.r1000.mx.aol.com (mtain-mk06.r1000.mx.aol.com [172.29.97.138]) by air-db06.mail.aol.com (v129.10) with ESMTP id MAILINDB063-86484dcb599e18; Wed, 11 May 2011 23:53:02 -0400 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-mk06.r1000.mx.aol.com (Internet Inbound) with ESMTP id E287738000082; Wed, 11 May 2011 23:53:00 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1QKMw8-0004wf-1Y for rs_out_1@blacksheep.org; Thu, 12 May 2011 04:51:40 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1QKMw4-0004wW-3e for rsgb_lf_group@blacksheep.org; Thu, 12 May 2011 04:51:36 +0100 Received: from bay0-omc1-s17.bay0.hotmail.com ([65.54.190.28]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1QKMw2-0004st-Kk for rsgb_lf_group@blacksheep.org; Thu, 12 May 2011 04:51:36 +0100 Received: from BAY154-W24 ([65.54.190.61]) by bay0-omc1-s17.bay0.hotmail.com with Microsoft SMTPSVC(6.0.3790.4675); Wed, 11 May 2011 20:51:27 -0700 Message-ID: X-Originating-IP: [81.200.63.88] From: Lubos OK2BVG To: _RSGB_LF Date: Thu, 12 May 2011 05:51:26 +0200 Importance: Normal In-Reply-To: <4DCAA066.8090701@iup.uni-heidelberg.de> References: <4DCAA066.8090701@iup.uni-heidelberg.de> MIME-Version: 1.0 X-OriginalArrivalTime: 12 May 2011 03:51:27.0347 (UTC) FILETIME=[DED2FC30:01CC1057] X-Spam-Score: 0.6 (/) X-Spam-Report: autolearn=disabled,HTML_IMAGE_ONLY_20=0.64,HTML_MESSAGE=0.001 Content-Type: multipart/alternative; boundary="_71df3de6-ba5b-48f2-a4f4-b92828f2b7f1_" Subject: RE: LF: Lf Frontend 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=FORGED_HOTMAIL_RCVD,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-sid: 3039ac1d618a4dcb599b3232 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none X-Mailer: Unknown (No Version) --_71df3de6-ba5b-48f2-a4f4-b92828f2b7f1_ Content-Type: text/plain; charset="iso-8859-2" Content-Transfer-Encoding: quoted-printable Hello Stefan!It is interesting, thanks for information and nice picture. Lubos, OK2BVG BTW: It seems, my grabber works. ******************************************* =20 > Date: Wed, 11 May 2011 16:42:46 +0200 > From: Stefan.Schaefer@iup.uni-heidelberg.de > To: rsgb_lf_group@blacksheep.org > Subject: LF: Lf Frontend >=20 > Hello group, >=20 > Here a picture of my new LF frontend of my active antenna,=20 > http://dl.dropbox.com/u/19882028/LF/LF%20frontend.jpg > It has a 2 stage bandpass filter in front of the first FET stage (BF862= =20 > which is located on the back side). The Q is not very high but DLF and= =20 > DCF49 are attenuated by about 15 dB. Additionally it provides a kind of= =20 > HV protection, i hope ;-) But the main purpose is to filter VLF and MF= =20 > and HF. On the older version i regularly saw MSK traces arround 136.6=20 > kHz. This is 153 kHz (DLF) minus 16.4 kHz (JXN)! :-) > After some test time it moves in a water proof PVC tube now and is=20 > intended to run 24/7 on the grabber as the omnidirectional antenna.=20 > Further improvements will be done in the shack, perhaps. >=20 > 73, Stefan/DK7FC >=20 =3D --_71df3de6-ba5b-48f2-a4f4-b92828f2b7f1_ Content-Type: text/html; charset="iso-8859-2" Content-Transfer-Encoding: quoted-printable Hello Stefan!

It is interesting, thanks for information and nice pictu= re.

Lubos, OK2BVG

BTW:= It seems, my grabber works. 3D"Vesel=FD

***********************= ********************

> Date: Wed, 11 May 2011= 16:42:46 +0200
> From: Stefan.Schaefer@iup.uni-heidelberg.de
>= ; To: rsgb_lf_group@blacksheep.org
> Subject: LF: Lf Frontend
>= ;
> Hello group,
>
> Here a picture of my new LF front= end of my active antenna,
> http://dl.dropbox.com/u/19882028/LF/LF%= 20frontend.jpg
> It has a 2 stage bandpass filter in front of the fi= rst FET stage (BF862
> which is located on the back side). The Q is= not very high but DLF and
> DCF49 are attenuated by about 15 dB.= Additionally it provides a kind of
> HV protection, i hope ;-) But= the main purpose is to filter VLF and MF
> and HF. On the older ve= rsion i regularly saw MSK traces arround 136.6
> kHz. This is 153= kHz (DLF) minus 16.4 kHz (JXN)! :-)
> After some test time it moves= in a water proof PVC tube now and is
> intended to run 24/7 on the= grabber as the omnidirectional antenna.
> Further improvements wil= l be done in the shack, perhaps.
>
> 73, Stefan/DK7FC
>=

=3D --_71df3de6-ba5b-48f2-a4f4-b92828f2b7f1_--