Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-dh05.r1000.mx.aol.com (Internet Inbound) with ESMTP id AC4CD3800008C; Sun, 20 Nov 2011 13:35:20 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1RSCDm-0004nA-3A for rs_out_1@blacksheep.org; Sun, 20 Nov 2011 18:34:30 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1RSCDl-0004n1-EL for rsgb_lf_group@blacksheep.org; Sun, 20 Nov 2011 18:34:29 +0000 Received: from mail16.primus.ca ([216.254.141.183] helo=mail-05.primus.ca) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1RSCDj-0001pj-3R for rsgb_lf_group@blacksheep.org; Sun, 20 Nov 2011 18:34:29 +0000 Received: from [98.124.27.48] (helo=Bigmachine.magma.ca) by mail-05.primus.ca with esmtpa (Exim 4.72) (envelope-from ) id 1RSCDg-0005Wq-1x for rsgb_lf_group@blacksheep.org; Sun, 20 Nov 2011 13:34:25 -0500 X-Mailer: QUALCOMM Windows Eudora Version 7.1.0.9 Date: Sun, 20 Nov 2011 13:34:35 -0500 To: rsgb_lf_group@blacksheep.org From: Bill de Carle In-Reply-To: References: <4EC92D9F.21482.1C03267@mike.dennison.ntlworld.com> Mime-Version: 1.0 X-Authenticated: ve2iq - (Bigmachine.magma.ca) [98.124.27.48] X-Spam-Score: 0.9 (/) X-Spam-Report: autolearn=disabled,HTML_10_20=0.945,HTML_MESSAGE=0.001 Message-Id: Subject: Re: LF: TF3HZ Content-Type: multipart/alternative; boundary="=====================_10835730==.ALT" 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=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-global-disposition: G X-AOL-SCOLL-SCORE: 0:2:473351808:93952408 X-AOL-SCOLL-URL_COUNT: 0 x-aol-sid: 3039ac1d41194ec948670f20 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none --=====================_10835730==.ALT Content-Type: text/plain; charset="iso-8859-1"; format=flowed Content-Transfer-Encoding: quoted-printable At 01:06 PM 11/20/2011, Markus DF6NM wrote: [..] >BTW Stefan's strong DFCW signal is producing an=20 >unusual modulation effect on Halld=F3r's grabber,=20 >as both the background noise and all other=20 >signals seem to brighten up during the dashes.=20 >Just like a kind of negative AGC... I noticed that happening on my grabber here - at=20 first I thought it might be high resistance in=20 the T/R relay contacts of my TS-850 (the banding=20 is not particularly correlated with Stefan's=20 dashes). I receive a relatively strong signal=20 from Mitch, VE3OT, who sends QRSS "MP" - it is=20 outside the screen range of my grabber but I=20 still hear it well. Even though my TS-850 AGC is=20 turned off, I know the soundcard in the netbook=20 I'm using has a lot of audio compression built in=20 and I have to keep the audio level quite low to=20 expect any kind approximation to a linear=20 response. Possibly the more-noise / less-noise=20 banding on the SL display is caused by local=20 signal from MP keying the compression circuit in=20 the soundcard? Tonight I'll try to reduce the=20 local signal with some slope-tuning high-cut to=20 see if it improves things. There is also an IF=20 notch filter on the TS-850 I haven't tried yet. 73, Bill VE2IQ --=====================_10835730==.ALT Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable At 01:06 PM 11/20/2011, Markus DF6NM wrote:
[..]

BTW Stefan's strong DFCW signal is producing an unusual modulation effect on Halld=F3r's grabber, as both the background noise and all other signals seem to brighten up during the dashes. Just like a kind of negative AGC...

I noticed that happening on my grabber here - at first I thought it might be high resistance in the T/R relay contacts of my TS-850 (the banding is not particularly correlated with Stefan's dashes). I receive a relatively strong signal from Mitch, VE3OT, who sends QRSS "MP" - it is outside the screen range of my grabber but I still hear it well. Even though my TS-850 AGC is turned off, I know the soundcard in the netbook I'm using has a lot of audio compression built in and I have to keep the audio level quite low to expect any kind approximation to a linear response. Possibly the more-noise / less-noise banding on the SL display is caused by local signal from MP keying the compression circuit in the soundcard? Tonight I'll try to reduce the local signal with some slope-tuning high-cut to see if it improves things. There is also an IF notch filter on the TS-850 I haven't tried yet.

73,
Bill VE2IQ
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