Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-da01.r1000.mx.aol.com (Internet Inbound) with ESMTP id CD720380000A5; Thu, 2 Feb 2012 16:46:55 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Rt4Ov-0002oI-R2 for rs_out_1@blacksheep.org; Thu, 02 Feb 2012 21:41:05 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Rt4Ov-0002o8-EM for rsgb_lf_group@blacksheep.org; Thu, 02 Feb 2012 21:41:05 +0000 Received: from smtpout1.wanadoo.co.uk ([80.12.242.29] helo=smtpout.wanadoo.co.uk) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1Rt4Ot-000854-6G for rsgb_lf_group@blacksheep.org; Thu, 02 Feb 2012 21:41:05 +0000 Received: from AGB ([2.26.21.175]) by mwinf5d07 with ME id V9gx1i0063mf3FE039gxnS; Thu, 02 Feb 2012 22:40:57 +0100 Message-ID: From: "Graham" To: References: <4F2AF61C.00002D.04364@BOB-PC> <49A09117B8F441CD8818AC2781B85FC3@JimPC> In-Reply-To: <49A09117B8F441CD8818AC2781B85FC3@JimPC> Date: Thu, 2 Feb 2012 21:40:57 -0000 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal Importance: Normal X-Mailer: Microsoft Windows Live Mail 14.0.8117.416 X-MimeOLE: Produced By Microsoft MimeOLE V14.0.8117.416 X-Antivirus: avast! (VPS 120202-2, 02/02/2012), Outbound message X-Antivirus-Status: Clean X-Spam-Score: 0.2 (/) X-Spam-Report: autolearn=disabled,RCVD_ILLEGAL_IP=0.234 Subject: Re: LF: New to group Content-Type: text/plain; format=flowed; charset="iso-8859-1"; reply-type=response Content-Transfer-Encoding: 7bit X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.1 required=5.0 tests=MISSING_OUTLOOK_NAME 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-SCOLL-SCORE: 0:2:450546976:93952408 X-AOL-SCOLL-URL_COUNT: 0 x-aol-sid: 3039ac1d40494f2b044f146d X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none Good point that Jim ! yes 136.00 Other bits , use wide filter / ssb , gives best results Frequency stability requirements for Op32 is +/- 1 hz over the 32 min period , this may be a little wider now , but warm up drift can be a problem.... as I know after waiting 64 mins .. with no ding Gary's -41 is about the limit for OP32 , but that's average along the tx time line as well , so perhaps slightly lower is possible , but a long time to find out .. 73 -G. -------------------------------------------------- From: "James Moritz" Sent: Thursday, February 02, 2012 9:31 PM To: Subject: Re: LF: New to group > Dear Bob, Graham, > > I think you mean it should be 10.136 USB; to get signals centred on > 137.5kHz to an audio output of 1.5kHz, the carrier should be at 136.0kHz > > Also, when using a converter, it would be worth checking the frequency > accuracy of the 10MHz conversion oscillator - it should be no more than a > few 10s of hertz out if there is not to be serious mis-alignment beteen > the expected and actual received frequencies, considering the slower Op32 > "band" is only 100Hz wide. The RX frequency can be offset slightly to > compensate for an error in the converter frequency (or for an error in the > RX frequency, for that matter...). > > Cheers, Jim Moritz > 73 de M0BMU >