Return-Path: <owner-rsgb_lf_group@blacksheep.org> X-Spam-DCC: paranoid 1290; Body=3 Fuz1=3 Fuz2=3 X-Spam-Checker-Version: SpamAssassin 3.1.3 (2006-06-01) on lipkowski.org X-Spam-Level: X-Spam-Status: No, score=0.0 required=5.0 tests=BAYES_00,DNS_FROM_AHBL_RHSBL, DRUG_DOSAGE,FORGED_RCVD_HELO autolearn=no version=3.1.3 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by paranoid.lipkowski.org (8.13.7/8.13.7) with ESMTP id t4JH7X72024254 for <sq5bpf@lipkowski.org>; Tue, 19 May 2015 19:07:33 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Yukw1-0004iv-Kq for rs_out_1@blacksheep.org; Tue, 19 May 2015 18:04:05 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Yukw1-0004im-54 for rsgb_lf_group@blacksheep.org; Tue, 19 May 2015 18:04:05 +0100 Received: from s16315160.onlinehome-server.info ([87.106.80.234] helo=mail.vigilant.es) by relay1.thorcom.net with esmtp (Exim 4.85) (envelope-from <luis@vigilant.es>) id 1Yukvx-0000x4-Vx for rsgb_lf_group@blacksheep.org; Tue, 19 May 2015 18:04:04 +0100 Received: from servigilant.vigilant.local ([87.216.178.132]) by vigilant.es with MailEnable ESMTP; Tue, 19 May 2015 19:03:43 +0200 Received: from servigilant.vigilant.local ([fe80::3cdf:95f8:c1c9:3931]) by servigilant.vigilant.local ([fe80::3cdf:95f8:c1c9:3931%17]) with mapi id 14.03.0123.003; Tue, 19 May 2015 19:03:45 +0200 From: =?iso-8859-1?Q?VIGILANT_Luis_Fern=E1ndez?= <luis@vigilant.es> To: "rsgb_lf_group@blacksheep.org" <rsgb_lf_group@blacksheep.org> Thread-Topic: LF: 23:16 136 G6AVK de EB3FRN-1 Op32 Deep Search 725 mi -40 dB Thread-Index: AQHQkjMNiOUTj9URcEuC3UbROTSh+52DURkAgAArD7A= Date: Tue, 19 May 2015 17:03:44 +0000 Message-ID: <579355A36AEE9D4FA555C45D556003AB1B106C70@servigilant.vigilant.local> In-Reply-To: <555B5BBE.1020800@kpnmail.nl> Accept-Language: es-ES, en-US Content-Language: es-ES X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [192.168.0.2] MIME-Version: 1.0 X-Scan-Signature: 2ee80849a5d572dbc974bb207a527753 Subject: RE: LF: 23:16 136 G6AVK de EB3FRN-1 Op32 Deep Search 725 mi -40 dB Content-Type: text/plain; charset="iso-8859-1" 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-Scanned-By: MIMEDefang 2.56 on 10.1.3.10 Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from quoted-printable to 8bit by paranoid.lipkowski.org id t4JH7X72024254 Status: O X-Status: X-Keywords: X-UID: 3150 Hi Jan, Stefan I have been using the vertical antenna (11m really) as a first Tx Ae, with NO loading coil and 11m wire hanging down as counter poise. A 7Mhz vertical dipole suspended at 90m high really The horizontal loop is 10dB over the vertical on my monitor at 7Km. But would be interesting to test the vertical with a coil and proper adapter. I guess can try this quicker than the slopper The building structure is made of metal reinforced concrete. Probably the choice to get a counter poise is the fire extinguish wet column, which runs inside the building. A true metal pipe filled with water and not connected to houses, just to hoses for emergency use. I can also run a wire down parallel to this pipe but not sure if can connect it to true ground at the bottom Which feeding system and coil do you suggest ? Perfectly understood the path stability problems on MF Stefan. At the moment I keep QRSS on 476.177 and got reports from EA1FAQ, EA4NZ and EB3FRN. I have set a kinf of "contest" sending different messages that they have to copy. This are some winner screenshots. Tx time for DFCW is 60 sec. Will try shorter https://dl.dropboxusercontent.com/u/7162072/Docs/EA1FAQ%20Rx%20QRSS%20MF%2015%20mayo%202015.jpg https://dl.dropboxusercontent.com/u/7162072/Docs/EB3FRN%20copy%20EA5DOM%20QRSS%20476KHz.bmp https://dl.dropboxusercontent.com/u/7162072/Docs/EA4NZ%20Rx%20QRSS%20MF.jpg LF/MF Always learning ! Always fun :-) 73 de Luis EA5DOM -----Mensaje original----- De: owner-rsgb_lf_group@blacksheep.org [mailto:owner-rsgb_lf_group@blacksheep.org] En nombre de pa3abk Enviado el: martes, 19 de mayo de 2015 17:50 Para: rsgb_lf_group@blacksheep.org Asunto: Re: LF: 23:16 136 G6AVK de EB3FRN-1 Op32 Deep Search 725 mi -40 dB If his building has a "metal frame" and he is able to get a firm hardware connection to that, it is worth to try. In the maritime world, e.g. drill rigs, the antenna tuner for the heli beacon is sometimes found in top of the drill tower with a small "attic" as counter poise. The whole drill tower becomes part of the antenna. The improved height benefits the radiation. BTW it's very rare that in a oil hazardous enviroment these kind of antenna's are accepted. See attachment of antenna of a drill rig Pelican. In this link you can see the attic on top the tower: http://www.gustomsc.com/index.php/zoo/reference-list/doc_download/596-pelican-class-drillships Jan/pa3abk On 19-5-2015 14:50, DK7FC wrote: > Hi Luis, > > Am 19.05.2015 12:46, schrieb VIGILANT Luis Fernández: >> [...] >> It is amazing to check how just a little of vertical antenna height >> increase can boost the Tx signal ! :-) > ...so maybe it is worth to try a 10m vertical on your high rise > building? :-) > >> The question is .... What should be expected from a Op2H with Dynamic >> Search ?? > For low distances it will work as expected, i.e. about 120/30 = 4 => 6 > dB 'better' but for DX you will need a stable path! This will work on > VLF but not on LF and not at all on MF. This is why WSPR-15 is used > on LF but not on MF. > For MF, something arround QRSS-10 is the slowest useful mode i think, > at least for DX. See > https://dl.dropboxusercontent.com/u/19882028/MF/DK7FC_QRSS-10_476_KHz_ > 12-28-2012.jpg to get an impression how blurry a QRSS-10 MF signal > becomes in some 1000 km distance. > > 73, Stefan > > -- pa3abk <-> dordrecht jo21it Sent by Philips STB-75 with T100