Return-Path: Received: from mtain-dg12.r1000.mx.aol.com (mtain-dg12.r1000.mx.aol.com [172.29.65.20]) by air-mb01.mail.aol.com (v129.4) with ESMTP id MAILINMB013-a1874d3eeceb2a8; Tue, 25 Jan 2011 10:31:55 -0500 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-dg12.r1000.mx.aol.com (Internet Inbound) with ESMTP id E043138000104; Tue, 25 Jan 2011 10:31:53 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Phkr8-0000sa-9e for rs_out_1@blacksheep.org; Tue, 25 Jan 2011 15:30:54 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Phkr7-0000sR-Sl for rsgb_lf_group@blacksheep.org; Tue, 25 Jan 2011 15:30:53 +0000 Received: from out1.ip08ir2.opaltelecom.net ([62.24.128.244]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1Phkr5-0004ZK-9E for rsgb_lf_group@blacksheep.org; Tue, 25 Jan 2011 15:30:53 +0000 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AjEFAL57Pk1cEYyQ/2dsb2JhbACSLQOSPnO9A4VPBJAJ X-IronPort-AV: E=Sophos;i="4.60,374,1291593600"; d="scan'208,217";a="477782961" Received: from unknown (HELO xphd97xgq27nyf) ([92.17.140.144]) by out1.ip08ir2.opaltelecom.net with SMTP; 25 Jan 2011 15:30:43 +0000 Message-ID: <003501cbbca4$d225c460$0401a8c0@xphd97xgq27nyf> From: "mal hamilton" To: "rsgb" Date: Tue, 25 Jan 2011 15:30:39 -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: What Frequency Content-Type: multipart/alternative; boundary="----=_NextPart_000_0032_01CBBCA4.D1D27440" 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: 3039ac1d41144d3eece92d4f X-AOL-IP: 195.171.43.25 ------=_NextPart_000_0032_01CBBCA4.D1D27440 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable VLF/LF Beware of invalid activity on some frequencies. When tuning across a= frequency range with a narrow band RX say from Low to High, use a spe= ctrum display and look out for activity that is going in the wrong dir= ection ie Hight to low these are IMAGE frequencies and invalid.=20 Using a wideband display these Images will appear along side real sign= als but you cannot be sure what is real. Sound cards are probably vune= rable to this problem except precautions are taken. Depending on antennas, mixer products or sampling rates Images will ap= pear even on High Quality receivers like W&J and others. BEWARE de G3KEV ------=_NextPart_000_0032_01CBBCA4.D1D27440 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
VLF/LF
Beware of invalid activity on some fr= equencies.=20 When tuning across a frequency range with a narrow band RX say fr= om Low to=20 High, use a spectrum display and look out for activity that is going= in the=20 wrong direction ie Hight to low these are IMAGE frequencies and invali= d.=20
Using a wideband display these Images= will=20 appear along side real signals but you cannot be sure what= =20 is real. Sound cards are probably vunerable to this problem= except=20 precautions are taken.
Depending on antennas, mixer products= or sampling=20 rates Images will appear even on High Quality receivers like W&J= and=20 others.
BEWARE
de G3KEV
 
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