Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-mp01.r1000.mx.aol.com (Internet Inbound) with ESMTP id 794E138000408; Wed, 7 Sep 2011 19:30:19 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1R1RXc-00031L-Q3 for rs_out_1@blacksheep.org; Thu, 08 Sep 2011 00:28:24 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1R1RXc-00031C-9t for rsgb_lf_group@blacksheep.org; Thu, 08 Sep 2011 00:28:24 +0100 Received: from out1.ip05ir2.opaltelecom.net ([62.24.128.241]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1R1RXZ-0004mq-VO for rsgb_lf_group@blacksheep.org; Thu, 08 Sep 2011 00:28:24 +0100 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AkMBALz8Z05cHn6t/2dsb2JhbABDFoh5j15DjkF5gUEFAQEEAQgBAQNJAg8FCggGAQEDBQIBAxEEAQEKJRQBBBoGFggGEwoBAgIBAYdkAgK4AYZrBIc9nQw X-IronPort-AV: E=Sophos;i="4.68,347,1312153200"; d="scan'208";a="353868785" Received: from host-92-30-126-173.as13285.net (HELO xphd97xgq27nyf) ([92.30.126.173]) by out1.ip05ir2.opaltelecom.net with SMTP; 08 Sep 2011 00:28:15 +0100 Message-ID: <009101cc6db5$d1702e80$0401a8c0@xphd97xgq27nyf> From: "mal hamilton" To: References: <4E6695F9.8060402@iup.uni-heidelberg.de> <4E6727E8.5040508@iup.uni-heidelberg.de> <4E676569.5030207@iup.uni-heidelberg.de> <4E6776EC.8090202@iup.uni-heidelberg.de> <4E67989F.9040000@iup.uni-heidelberg.de> <4E67AF85.7000002@iup.uni-heidelberg.de> Date: Thu, 8 Sep 2011 00:28:15 +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: LF: Re: Effects of noise burst Content-Type: text/plain; charset="iso-8859-1" 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=0.0 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: 0:2:477173632:93952408 X-AOL-SCOLL-URL_COUNT: 0 x-aol-sid: 3039ac1dc1454e67fe8a26d9 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none Hi Bill Any sign of signals yet . I am blasting away on 136.173 qrs30. and can see a trace on the YO grabber and an odd hit on the 4X1 grabber. de Mal/g3kev ----- Original Message ----- From: "Bill de Carle" To: Sent: Wednesday, September 07, 2011 10:24 PM Subject: LF: Effects of noise burst > I noticed my marker line was getting chopped up at times on both > Spectrum Lab screens. At first I thought it was another strong > carrier off-screen for the SL display but still within the 500-Hz Cw > filter's passband. There are several clearly *audible* signals in > there at times. So I brought up ARGO for a wider view using 3-second > dot mode. You can see my marker at 136.170 Khz along with several > other much stronger signals. Around the middle of the time grab it > seems as if everything went dead - in fact it was a 45-second burst > of local noise. Not much of anything audible but I saw the S-meter > jump up about 30 dB (cutting back the RF gain and making the other > weaker signals disappear). Interesting how the background looks > exactly the same during the noise burst as at other times. We don't > *see* any noise here, we see the *absence* of all the usual > signals. That noise is what chops up my marker lines on the two .usr > spectrum lab screens. Although still full daylight here it's getting > near supper time and people are turning on appliances. Things will > quiet down later hopefully. Here's the ARGO screen: > > http://www.nrtco.net/~ve2iq/grabs/136argo.jpg > > Bill, VE2IQ > >