Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-mg01.r1000.mx.aol.com (Internet Inbound) with ESMTP id A078B380000CB; Wed, 31 Aug 2011 01:41:32 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1QydWp-0003JA-Th for rs_out_1@blacksheep.org; Wed, 31 Aug 2011 06:39:59 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1QydWp-0003J1-8d for rsgb_lf_group@blacksheep.org; Wed, 31 Aug 2011 06:39:59 +0100 Received: from anchor-post-3.mail.demon.net ([195.173.77.134]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1QydWn-0006MI-U3 for rsgb_lf_group@blacksheep.org; Wed, 31 Aug 2011 06:39:59 +0100 Received: from sighthound.demon.co.uk ([80.177.174.126]) by anchor-post-3.mail.demon.net with esmtp (Exim 4.69) id 1QydWn-00021w-mY for rsgb_lf_group@blacksheep.org; Wed, 31 Aug 2011 05:39:57 +0000 Received: from opc1.twatt.home (opc1.twatt.home [192.168.21.16]) by svr1.twatt.home (Postfix) with ESMTP id 14FD81BF81 for ; Wed, 31 Aug 2011 05:39:56 +0000 (UTC) Date: Wed, 31 Aug 2011 05:39:56 +0000 (GMT Standard Time) From: John P-G To: rsgb_lf_group@blacksheep.org In-Reply-To: <6C0D771461734A5BAA50CFBE70FC553D@AGB> Message-ID: References: <6C0D771461734A5BAA50CFBE70FC553D@AGB> User-Agent: Alpine 2.00 (WNT 1167 2008-08-23) Organization: The Gammy Bird X-X-Sender: gm4slv@svr1.twatt.home MIME-Version: 1.0 X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,none Subject: Re: LF: ROS Content-Type: TEXT/PLAIN; charset=US-ASCII X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.0 required=5.0 tests=none 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: 0:2:473494368:93952408 X-AOL-SCOLL-URL_COUNT: 0 x-aol-sid: 3039ac1d60c94e5dc98b4714 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none On Tue, 30 Aug 2011, Graham wrote: > Thank's John, > > Ahh -3db splitter .. so that makes my 1 Watt Tx , now 500mW > carrier feed to the Ae ! > which with a good following breeze is round 1 mW erp ... ! > G It was already being split with a 3dB splitter (one feed to the grabber RX and another to the main RX). Now there's a 2nd splitter, so the main RX is getting -6dB wrt the antenna signal. This makes little difference, as the system noise figure is still better than the band noise, so your effective S/N doesn't change, and your original ERP is really what counts. If you reduce /THAT/ by 6dB I think I'd notice in poorer S/N or fewer decodes as your signal drops into the band noise. I've got ROS working in TX mode now too... will try a QSO later tonight. Cheers, John GM4SLV