Return-Path: Received: from rly-de04.mx.aol.com (rly-de04.mail.aol.com [172.19.170.140]) by air-de04.mail.aol.com (v123.3) with ESMTP id MAILINDE043-4d049c15f133d9; Wed, 18 Mar 2009 16:52:53 -0400 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by rly-de04.mx.aol.com (v123.3) with ESMTP id MAILRELAYINDE047-4d049c15f133d9; Wed, 18 Mar 2009 16:52:36 -0400 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Lk2kL-0002rZ-L3 for rs_out_1@blacksheep.org; Wed, 18 Mar 2009 20:52:17 +0000 Received: from [83.244.159.144] (helo=relay3.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Lk2kL-0002rQ-2x for rsgb_lf_group@blacksheep.org; Wed, 18 Mar 2009 20:52:17 +0000 Received: from mail-fx0-f174.google.com ([209.85.220.174]) by relay3.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1Lk2kI-000422-KC for rsgb_lf_group@blacksheep.org; Wed, 18 Mar 2009 20:52:17 +0000 Received: by fxm22 with SMTP id 22so256816fxm.4 for ; Wed, 18 Mar 2009 13:52:09 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=googlemail.com; s=gamma; h=domainkey-signature:mime-version:received:in-reply-to:references :date:message-id:subject:from:to:content-type; bh=rYmWE7PQ3upKTVlLO1FSM0Np3nIIIIMOU9ptj1jdfj0=; b=xc6ymsZd/msCRRZST50rhaGINGAtgXZbTJTO8TJ4wnLeJT5YM3lR6Suq0WJwDO4THI 4V7/YXbzu6n3TxjEj0LvrMX8JQxug71TROkFCDeLRq7M1iwmeM1sECoxAVv3ZanpvvNr 8ziMGpmBomTnVQHzFKbjaMwQckpWlZ7xm70Es= DomainKey-Signature: a=rsa-sha1; c=nofws; d=googlemail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type; b=aXa8pQyHeEv7lMsbQsECtxUiP/KbE6D4V+Q/edfdkFthzOKPS2LmkudeT1kTWUMS4s 8Jtqzos9Vk0nFseIrLg/tclXAJVtk8TjO05KNRqG1S9Vj97KrgFvhQTnuNwQUEzjGocV o9qsLvo4sJQwggDqbw6qNIksDhRtwDX+QbVZE= MIME-Version: 1.0 Received: by 10.204.50.195 with SMTP id a3mr542781bkg.123.1237409528563; Wed, 18 Mar 2009 13:52:08 -0700 (PDT) In-Reply-To: References: <009001c9a588$7eb02c60$6401a8c0@asus> <005101c9a679$df148f50$6401a8c0@asus> <916F3329CAA846A19B450540FCC7E0AB@AGB> Date: Wed, 18 Mar 2009 20:52:08 +0000 Message-ID: From: Andy Talbot To: rsgb_lf_group@blacksheep.org DomainKey-Status: good (testing) X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,HTML_MESSAGE=0.001 Subject: Re: LF: RE: Syncback software QQQ Content-Type: multipart/alternative; boundary=001636c5ad0d64478104656adbfa 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 X-AOL-SCOLL-AUTHENTICATION: mail_rly_antispam_dkim-d229.2 ; domain : googlemail.com DKIM : pass X-Mailer: Unknown (No Version) --001636c5ad0d64478104656adbfa Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit If timing slips, the averaged power will be out by the amount of slippage. So, for a 1 second error the total power summed over the window is 4/5, or about 1dB down. For 2.5s slippage, -3dB BUT.. ... this may be only an approximation as windowing is applied so the contribution from the power measured at the middle of the timing window is given a greater weigthing than the measurement at either end. In this event, slight timing error will introduce even less error. Andy G4JNT www.g4jnt.com 2009/3/18 Graham > Andy, > > Q .. If the tx is keyed by vox/breakin will the slight clipping of > the leading edge of the beacon cause time problems ?? > reason being .. if use force 'tx' will miss the beacon rx windows ?? > > Tnx- G .. > > *From:* Andy Talbot > *Sent:* Tuesday, March 17, 2009 4:27 PM > *To:* rsgb_lf_group@blacksheep.org > *Subject:* Re: LF: RE: Syncback software > > That should have read http://www.g4jnt.com/PCBCN.zip > > Andy G4JNT > www.g4jnt.com > > > 2009/3/17 Andy Talbot > >> Try http://www.g4jnt.com/beacons.htm and go to PCBCN at the bottom >> or directly >> > ------------------------------ > > > No virus found in this incoming message. > Checked by AVG - www.avg.com > Version: 8.0.237 / Virus Database: 270.11.16/2006 - Release Date: 03/17/09 > 07:23:00 > > --001636c5ad0d64478104656adbfa Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
If timing slips, the averaged power will be out by the amount of slippa= ge.=A0 So,=A0for a=A01 second error the total power summed over=A0the=A0wind= ow is 4/5, or about 1dB down.=A0=A0 For 2.5s slippage, -3dB
=A0
BUT..
=A0
.. this=A0may be=A0only an approximation as windowing is applied so the= contribution from the power measured at the middle of the timing window is=20= given a greater weigthing than the measurement at either end.=A0 In this eve= nt, slight timing error will introduce even less error.

Andy =A0G4JNT
www= .g4jnt.com


2009/3/18 Graham <g8fzk@g8fzk.fsnet.co.uk>
Andy,
=A0
Q .. If the=A0 tx is keyed by vox/break= in=A0=A0=A0 will the slight=A0 clipping of the=A0 leading edge of the=A0 bea= con=A0 cause time problems ??
reason being=A0 .. if use force 'tx= ' will miss the=A0 beacon rx windows ??
=A0
Tnx- G ..


Andy =A0G4JNT
www.g4jnt.com


2009/3/17 Andy Talbot <andy.g4jnt@googlem= ail.com>
Try http= ://www.g4jnt.com/beacons.htm=A0=A0=A0=A0and go to =A0PCBCN at the bottom=
=A0or directly=A0


No virus found in this incoming message.
Checked by AVG - www.avg.com
Version: 8= .0.237 / Virus Database: 270.11.16/2006 - Release Date: 03/17/09 07:23:00


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