Return-Path: Received: from rly-dg07.mx.aol.com (rly-dg07.mail.aol.com [172.19.151.91]) by air-dg05.mail.aol.com (v121_r5.5) with ESMTP id MAILINDG051-5db4957c1d3239; Sun, 28 Dec 2008 13:13:55 -0500 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by rly-dg07.mx.aol.com (v121_r4.4) with ESMTP id MAILRELAYINDG074-5db4957c1d3239; Sun, 28 Dec 2008 13:13:42 -0500 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1LH08h-00040v-QT for rs_out_1@blacksheep.org; Sun, 28 Dec 2008 18:13:23 +0000 Received: from [83.244.159.144] (helo=relay3.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1LH08h-00040m-7g for rsgb_lf_group@blacksheep.org; Sun, 28 Dec 2008 18:13:23 +0000 Received: from smtp-out-3.talktalk.net ([62.24.128.233] helo=smtp.talktalk.net) by relay3.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1LH08f-0007ZD-0p for rsgb_lf_group@blacksheep.org; Sun, 28 Dec 2008 18:13:23 +0000 X-Path: TTSMTP X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: As8EAD5QV0lOlIwd/2dsb2JhbACCboFmhksGsg9YjnmGRA Received: from unknown (HELO mal769a60aa920) ([78.148.140.29]) by smtp.talktalk.net with SMTP; 28 Dec 2008 18:13:15 +0000 Message-ID: <00a501c96917$f3cc8140$0301a8c0@mal769a60aa920> From: "mal hamilton" To: "rsgb" Date: Sun, 28 Dec 2008 18:13:14 -0000 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.2180 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,HTML_MESSAGE=0.001 Subject: LF: 500 qsb Content-Type: multipart/alternative; boundary="----=_NextPart_000_00A2_01C96917.F389ABE0" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.8 required=5.0 tests=HTML_30_40,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-IP: 193.82.116.20 ------=_NextPart_000_00A2_01C96917.F389ABE0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable One has to be careful about wideband signals, for instance AM on MF can suff= er from Selective fading, various components across the several khz of bandw= idth carrying the modulation can fade causing distortion, which most will ha= ve observed.=20 Some spread spectrum systems(there are a few varities) try to overcome this=20= selective fading but in essence it relies on one specific frequency being re= ceived out of the multitude, so really its back to a narrow signal making i= t. I have tried to keep it simple, in reality it is more involved. =20 G3KEV ------=_NextPart_000_00A2_01C96917.F389ABE0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

One has to be careful about wideband signal= s, for=20 instance AM on MF can suffer from Selective fading, various components acros= s=20 the several khz of bandwidth carrying the modulation can fade causing=20 distortion, which most will have observed.

Some spread spectrum systems(there are a=20 few varities) try to overcome this selective fading but in essence it=20 relies on one specific frequency being received out of the multit= ude,=20 so really its back to a narrow signal making it.

I have tried to keep it simple, in reality=20= it is=20 more involved.

G3KEV

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