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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 Andy ! From my own experiments I would suggest to move the loading coil from Base-load to top-load, situated at the top of the tube just below the top hat. This position gives significantly more current into the 2m long tube than base-loading. [...] Content analysis details: (-0.7 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at http://www.dnswl.org/, no trust [212.227.15.19 listed in list.dnswl.org] 0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider (dg3lv[at]gmx.net) -0.0 SPF_PASS SPF: sender matches SPF record -0.7 RP_MATCHES_RCVD Envelope sender domain matches handover relay domain X-Scan-Signature: c0336009bd9bab526ca27d297ea7579a Subject: Re: LF: Testing WSPR2 to night a short antenna for future mobile use on MF band. Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: * X-Spam-Status: No, hits=1.6 required=5.0 tests=CELL_PHONE_BOOST 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 Hi Andy ! From my own experiments I would suggest to move the loading coil from Base-load to top-load, situated at the top of the tube just below the top hat. This position gives significantly more current into the 2m long tube than base-loading. Sorri, nothing to be seen on 475.625 from you, not even the faintest line on the waterfall. (Distance is 731 km) "mobile use" sounds very interesting to me, that could be a challenge ! The body of the car is an integral part of the antenna, so the earth rod may not give comparable results. 73 de dg3lv Tobias Am 10.06.2014 18:53, schrieb André Guyé: > Hi to all. > > I am thinking now about the design of a short vertical antenna, for MF > mobile use in next winter season. > > To night I’ll test this first configuration : a 2 meters high tube (2 cm > of diameter) and a top hat (wheel shape) 80 cm of diameter. It needs > about 2.4 mH base coil tuning. The *TX is 3 Watts output*. Base voltage > is 2,2 kV RMS. > > *I’ll test this small antenna to night*, beginning at 2000 TU on WSPR2 > MF band. The expected ERP is about 1 mW. > > All reports be welcome. Note that to night the testing antenna has his > base on the garden with a ground earth rod, so it is not installing on > my car. > > 73 de Andy. F6CNI - JN19QB > > > > ------------------------------------------------------------------------ > > > Ce courrier électronique ne contient aucun virus ou logiciel malveillant > parce que la protection Antivirus avast! est > active. > >