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[195.171.43.25]) by mx.google.com with ESMTP id e5si15932884eeg.252.2013.07.08.03.53.06 for ; Mon, 08 Jul 2013 03:53:06 -0700 (PDT) Received-SPF: neutral (google.com: 195.171.43.25 is neither permitted nor denied by best guess record for domain of owner-rsgb_lf_group@blacksheep.org) client-ip=195.171.43.25; Authentication-Results: mx.google.com; spf=neutral (google.com: 195.171.43.25 is neither permitted nor denied by best guess record for domain of owner-rsgb_lf_group@blacksheep.org) smtp.mail=owner-rsgb_lf_group@blacksheep.org; dkim=pass header.i=@gmail.com Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Uw8y9-0004dR-37 for rs_out_1@blacksheep.org; Mon, 08 Jul 2013 11:46:57 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Uw8y8-0004dI-L3 for rsgb_lf_group@blacksheep.org; Mon, 08 Jul 2013 11:46:56 +0100 Received: from mail-ie0-f182.google.com ([209.85.223.182]) by relay1.thorcom.net with esmtps (TLSv1:RC4-SHA:128) (Exim 4.77) (envelope-from ) id 1Uw8y6-0005KV-MW for rsgb_lf_group@blacksheep.org; Mon, 08 Jul 2013 11:46:55 +0100 Received: by mail-ie0-f182.google.com with SMTP id s9so9768872iec.13 for ; Mon, 08 Jul 2013 03:46:52 -0700 (PDT) X-DKIM-Result: Domain=gmail.com Result=Good and Known Domain DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type:content-transfer-encoding; bh=N1EnVm0wsHXr46XFZNCue56rkY/VK5csqn1+Qvynb6A=; b=wYkUre+tZUj73aB3KpJBPGPT2LJRi8N77VupP5hhvO352lsDyG8PPOgrApCKS3Usg7 ZYz+VmbfoeC5zXo89QeITmkkREb+EFj9lOE02MEeUeaugRoxj5e4hG/SgYwhufdKopDN gzdEeNPpZ3Rf7ImeHReMxLEJ+a9Wg6ZUz2qU1R3eU/lBjMTadw8p67Kf31EfC6AaZlnQ D98bQDeYLFgJwxZmvDdJN9GPryaTzwD87J05XFsrQkhVPIjv0lfY5qB2ikkgQcoJKmzR 50VjXwKPoKM9N+9YLCx/pPm7NXzlCyiioZTuNTyAPYXX8PSqYPeHG7zpUELUhJJ7ePM0 FBRA== MIME-Version: 1.0 X-Received: by 10.42.47.69 with SMTP id n5mr6929931icf.24.1373280412026; Mon, 08 Jul 2013 03:46:52 -0700 (PDT) Received: by 10.50.87.161 with HTTP; Mon, 8 Jul 2013 03:46:51 -0700 (PDT) In-Reply-To: <51DA0212.8020808@iup.uni-heidelberg.de> References: <51D498BD.3050007@iup.uni-heidelberg.de> <005b01ce798a$b0476600$6d01a8c0@DELL4> <20130706131640.GG5246@cs.utwente.nl> <7D6B8CBB38964C9C82487F5D0F3648FC@FMVXD1232> <20130707203537.GA30691@cs.utwente.nl> <51DA00C8.6000600@iup.uni-heidelberg.de> <51DA0212.8020808@iup.uni-heidelberg.de> Date: Mon, 8 Jul 2013 20:46:51 +1000 Message-ID: From: Dimitrios Tsifakis To: rsgb_lf_group@blacksheep.org X-Spam-Score: -0.7 (/) X-Spam-Report: Spam detection software, running on the system "relay1.thorcom.net", has identified this incoming email as possible spam. The original message has been attached to this so you can view it (if it isn't spam) or label similar future email. If you have any questions, see the administrator of that system for details. Content preview: HI Stefan, Owen, VK1OD, has done a similar experiment and has placed a video on youtube. Have a look at his updated web page: http://vk1od.net/antenna/PA0RDT-MiniWhip/index.htm [...] Content analysis details: (-0.7 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.7 RCVD_IN_DNSWL_LOW RBL: Sender listed at http://www.dnswl.org/, low trust [209.85.223.182 listed in list.dnswl.org] 0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider (dtsifakis[at]gmail.com) -0.0 SPF_PASS SPF: sender matches SPF record 0.0 T_DKIM_INVALID DKIM-Signature header exists but is not valid X-Scan-Signature: fc152e7304849b9a177649b85aea9f41 Subject: Re: LF: Re: MiniWhip antenna, fiber optic Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable 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=none 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 Status: O X-Status: X-Keywords: X-UID: 2812 HI Stefan, Owen, VK1OD, has done a similar experiment and has placed a video on youtube. Have a look at his updated web page: http://vk1od.net/antenna/PA0RDT-MiniWhip/index.htm 73, Dimitris 2013/7/8 Stefan Sch=E4fer : > another image of the TX: > https://dl.dropboxusercontent.com/u/19882028/LF/DK7FC_fiber%20optic%20act= ive%20dipole_TX2.jpg > > Am 08.07.2013 01:59, schrieb Stefan Sch=E4fer: > > Hi all, > > OK, although it can't work (do you remember?!) i built an active antenna > with battery supply and fiber optic output. The active part is a BF862. T= he > circuit is quite simple: > https://dl.dropboxusercontent.com/u/19882028/LF/DK7FC_fiber%20optic%20act= ive%20dipole%20schematic.jpg > It is a first idea for the schematic. Maybe i will change it later so tha= t > the gate is shifted to 9V/2. Just for first experiments. In various tests > with the BF862 i found that it was necessary to add a ferrite bead direct= ly > in front of the gate to prevent VHF oscillations of the JFET. > > The TX is already working: > https://dl.dropboxusercontent.com/u/19882028/LF/DK7FC_fiber%20optic%20act= ive%20dipole_TX.jpg > Yes yes yes, it is not truely symmetric and the capacity at source must b= e a > bit larger than that of the leg connected to gate. Anyway it will be usef= ul > for some basic and interesting experiments. > > RX is ready tomorrow. > > 73, Stefan/DK7FC