Return-Path: Received: from mtain-mc02.r1000.mx.aol.com (mtain-mc02.r1000.mx.aol.com [172.29.96.74]) by air-dc10.mail.aol.com (v129.4) with ESMTP id MAILINDC103-86564c7d51791b3; Tue, 31 Aug 2010 15:01:13 -0400 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mtain-mc02.r1000.mx.aol.com (Internet Inbound) with ESMTP id BEEEE380000BF; Tue, 31 Aug 2010 15:01:11 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1OqW3t-0005zb-Jy for rs_out_1@blacksheep.org; Tue, 31 Aug 2010 20:00:01 +0100 Received: from [83.244.159.144] (helo=relay3.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1OqW3t-0005zS-5h for rsgb_lf_group@blacksheep.org; Tue, 31 Aug 2010 20:00:01 +0100 Received: from out1.ip04ir2.opaltelecom.net ([62.24.128.240]) by relay3.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1OqW3r-0002Ua-8T for rsgb_lf_group@blacksheep.org; Tue, 31 Aug 2010 20:00:01 +0100 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AvUHAB/tfExcEYTt/2dsb2JhbACPWQOQfWMOwH+FNwSNHA X-IronPort-AV: E=Sophos;i="4.56,299,1280703600"; d="scan'208,217";a="303266302" Received: from unknown (HELO xphd97xgq27nyf) ([92.17.132.237]) by out1.ip04ir2.opaltelecom.net with SMTP; 31 Aug 2010 19:54:49 +0100 Message-ID: <000a01cb493d$fb8f3410$0401a8c0@xphd97xgq27nyf> From: "mal hamilton" To: "rsgb" Date: Tue, 31 Aug 2010 19:54:46 +0100 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: 1.2 (+) X-Spam-Report: autolearn=disabled,HTML_MESSAGE=0.001,SUBJ_ALL_CAPS=1.166 Subject: LF: VLF THOUGHT Content-Type: multipart/alternative; boundary="----=_NextPart_000_0007_01CB4946.5CE37520" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: * X-Spam-Status: No, hits=1.0 required=5.0 tests=HTML_20_30,HTML_MESSAGE, SUBJ_ALL_CAPS 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: 3039ac1d604a4c7d517760c8 X-AOL-IP: 193.82.116.20 X-AOL-SPF: domain : blacksheep.org SPF : none ------=_NextPart_000_0007_01CB4946.5CE37520 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable I see 15 Kilowatt audio amplifiers advertised, therefore there must be= a speaker system, public address horns available for such amplifiers.= =20 If one of these speaker horns was directed line of sight towards the= horizon or a mountain top and a suitable dish positioned at the recei= ve end, it must be possibel to intercept such a signal at audio freque= ncies. eg Transmit a tone which could be keyed at 9 - 20 Kcs and see= what distance could be covered. Keeping the signal just above the normal human audio range would avoid= interference. or just TX a signal at say 5 Kcs and see how far it could be heard by= ear with this sort of power, maybe further than the same signal trans= mitted by radio means, except one had an exceptionally large antenna Maybe a NOV is required for this experiment!!!! de g3kev =20 ------=_NextPart_000_0007_01CB4946.5CE37520 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
I see 15 Kilowatt audio amplifiers ad= vertised,=20 therefore there must be a speaker system, public address horns availab= le for=20 such amplifiers.
If one of these speaker horns was dir= ected line of=20 sight towards the horizon or a mountain top and a suitable dish positi= oned at=20 the receive end, it must be possibel to intercept such a signal at aud= io=20 frequencies. eg Transmit a tone which could be keyed at 9 -= =20 20 Kcs and see what distance could be covered.
Keeping the signal just above the nor= mal human=20 audio range would avoid interference.
or just TX a signal at say 5 Kcs and&= nbsp;see how=20 far it could be heard by ear with this sort of power, maybe furth= er than=20 the same signal transmitted by radio means, except one had an exceptio= nally=20 large antenna
Maybe a NOV is required for this=20 experiment!!!!
de g3kev
 
 
 
  
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