Return-Path: Received: from mtain-dd03.r1000.mx.aol.com (mtain-dd03.r1000.mx.aol.com [172.29.64.143]) by air-dd02.mail.aol.com (v129.4) with ESMTP id MAILINDD021-86084d5fe7b591; Sat, 19 Feb 2011 10:54:29 -0500 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-dd03.r1000.mx.aol.com (Internet Inbound) with ESMTP id 8DD3F3800010F; Sat, 19 Feb 2011 10:54:24 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Pqp7q-0004Sc-Mp for rs_out_1@blacksheep.org; Sat, 19 Feb 2011 15:53:38 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Pqp7q-0004ST-9E for rsgb_lf_group@blacksheep.org; Sat, 19 Feb 2011 15:53:38 +0000 Received: from out1.ip07ir2.opaltelecom.net ([62.24.128.243]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1Pqp7o-00030o-Fq for rsgb_lf_group@blacksheep.org; Sat, 19 Feb 2011 15:53:38 +0000 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: Av0EACt2X01Ok8fr/2dsb2JhbACTdQOSPXO6NoVeBI9o X-IronPort-AV: E=Sophos;i="4.62,191,1297036800"; d="scan'208,217";a="480541320" Received: from unknown (HELO xphd97xgq27nyf) ([78.147.199.235]) by out1.ip07ir2.opaltelecom.net with SMTP; 19 Feb 2011 15:53:29 +0000 Message-ID: <007501cbd04d$2690bcb0$0401a8c0@xphd97xgq27nyf> From: "mal hamilton" To: "rsgb" Date: Sat, 19 Feb 2011 15:53:28 -0000 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2600.0000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2600.0000 X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,HTML_MESSAGE=0.001 Subject: LF: Antennas es power Content-Type: multipart/alternative; boundary="----=_NextPart_000_0072_01CBD04D.265C3F30" 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=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: 3039ac1d408f4d5fe7ad1953 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : temperror ------=_NextPart_000_0072_01CBD04D.265C3F30 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable It seems to me on the the lower frequencies to cover a reasonable dist= ance of a few hundred kilometres a good Antenna and plenty of RF power= is needed as has been proved by the recent experiments by DK7FC and= his kite antenna, OE5ODL and his balloon antenna and HE3OM with his= ex BC static tower antenna. Also I understand these stations are usin= g amplifiers of a few hundred watts hence a respectable ERP output.=20 On VLF es LF especially, using anything but a proper elevated antenna= is wasted time except one is content with a few kilometres coverage,= and earth probe inductive/conduction devices are only good for Cave= Divers. also to cover the greatest distances a Vertical and a proper loading coil= to resonate the system is the preferred method to launch the signal. I am able to copy OE5ODL and DK7FC on 9 Khz at 1400 kilometres and 800= kilometres respectively using vertical antennas. No signals heard from UK VLF/LF experimenters so far, except G3XIZ and= G3XDV appear the odd time on 137 Khz =20 De G3KEV ------=_NextPart_000_0072_01CBD04D.265C3F30 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

It seems to me on the the lower frequencies to= cover a=20 reasonable distance of a few hundred kilometres a good Antenna and ple= nty of RF=20 power is needed as has been proved by the recent experiments by DK7FC= and his=20 kite antenna, OE5ODL and his balloon antenna and HE3OM with his= ex BC=20 static tower antenna. Also I understand these stations are using ampli= fiers of a=20 few hundred watts hence a respectable ERP output.

On VLF es LF especially, using anything= but a proper=20 elevated antenna is wasted time except one is content with a few kilom= etres=20 coverage, and earth probe inductive/conduction devices are only= good for=20 Cave Divers.

also

to cover the greatest distances a Vertical and= a proper=20 loading coil to resonate the system is the preferred method to launch= the=20 signal.

I am able to copy OE5ODL and DK7FC on 9 Khz at= 1400=20 kilometres and 800 kilometres respectively using vertical antennas.

No signals heard from UK VLF/LF experimen= ters so far,=20 except G3XIZ and G3XDV appear the odd time on 137 Khz

De G3KEV

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