Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-mb05.r1000.mx.aol.com (Internet Inbound) with ESMTP id 3B3D1380000A0; Thu, 25 Aug 2011 09:25:20 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1QwZuq-0002WO-G4 for rs_out_1@blacksheep.org; Thu, 25 Aug 2011 14:24:16 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1QwZup-0002WF-W3 for rsgb_lf_group@blacksheep.org; Thu, 25 Aug 2011 14:24:15 +0100 Received: from out1.ip06ir2.opaltelecom.net ([62.24.128.242]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1QwZun-00015I-Hp for rsgb_lf_group@blacksheep.org; Thu, 25 Aug 2011 14:24:15 +0100 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AgoBANlLVk5cF/S8/2dsb2JhbABCmClEjxN4gTsFAQEFCAEBAyUBIwIPHQEBAwUCAQMRBAEBCiUUAQQaBhYIBhMKAQICAQGHY7s3hkwEpBU X-IronPort-AV: E=Sophos;i="4.68,280,1312153200"; d="scan'208";a="510275220" Received: from host-92-23-244-188.as13285.net (HELO xphd97xgq27nyf) ([92.23.244.188]) by out1.ip06ir2.opaltelecom.net with SMTP; 25 Aug 2011 14:24:07 +0100 Message-ID: <002701cc632a$431f4200$0401a8c0@xphd97xgq27nyf> From: "mal hamilton" To: References: <4E557C1B.6010504@iup.uni-heidelberg.de> <001f01cc6302$cc3595d0$0401a8c0@xphd97xgq27nyf> <4E5644E0.9070002@iup.uni-heidelberg.de> Date: Thu, 25 Aug 2011 14:24:03 +0100 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,none Subject: Re: LF: Re: KEV... Content-Type: text/plain; charset="ISO-8859-15" Content-Transfer-Encoding: 8bit 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: 0:2:501263808:93952408 X-AOL-SCOLL-URL_COUNT: 0 x-aol-sid: 3039ac1d60194e564d405d0b X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none Tnx Stefan for info. I do have a dsp/ variable bandpass filter arrangement already, that helps coniderably. de mal/g3kev ----- Original Message ----- From: "Stefan Schäfer" To: Sent: Thursday, August 25, 2011 1:49 PM Subject: Re: LF: Re: KEV... Mal, You cannot eliminate it but reduce it significantly. And the blanker helps a LOT rejecting the sferics! This is a big improvement during CW reception. The loud cracks are much weaker! First i would suggest to add a about 2 kHz wide band pass filter that cuts the strong peaks of DCF and HGA. The sidebands during a telegram will then be in the passband but the carrier is outside. In the SL Filter box i choose a center frequency of 137.3 kHz, bandwidth=1.5 kHz, slope=0.75 kHz. The noiseblanker settings are: ramp time= 2 ms, trigger peak/avrg= 9 dB, pre- and post-trigger = 0.5 ms, time constant = 1 s. Ensure to have installed V2.76b18 or later. There have been changes on the noiseblanker functions in these new versions. The filter is applied in the filter box, between L3 and L4, the noiseblanker is applied in "left blackbox 2" (between L4 and L5). 73, Stefan/DK7FC Am 25.08.2011 10:41, schrieb mal hamilton: > Stefan > What is the optimum setting for the Notch filter in Speclab to eliminate the > qrm on 138.5 Khz > mal/g3kev > > ----- Original Message ----- > From: "Stefan Schäfer" > To: > Sent: Wednesday, August 24, 2011 11:32 PM > Subject: LF: KEV... > > > >> Mal, you are visible even in that heavy QRN! Haven't thought this is >> possible. >> >> 73, Stefan >> >> >