Return-Path: Received: from rly-db02.mx.aol.com (rly-db02.mail.aol.com [172.19.130.77]) by air-db02.mail.aol.com (v121.4) with ESMTP id MAILINDB021-aab47d1a024330; Fri, 07 Mar 2008 15:06:21 -0500 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by rly-db02.mx.aol.com (v121.4) with ESMTP id MAILRELAYINDB021-aab47d1a024330; Fri, 07 Mar 2008 15:05:59 -0500 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1JXioY-0005QT-6t for rs_out_1@blacksheep.org; Fri, 07 Mar 2008 20:05:10 +0000 Received: from [83.244.159.144] (helo=relay3.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1JXioX-0005QK-ME for rsgb_lf_group@blacksheep.org; Fri, 07 Mar 2008 20:05:09 +0000 Received: from mout1.freenet.de ([195.4.92.91]) by relay3.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1JXioQ-0000fq-Pa for rsgb_lf_group@blacksheep.org; Fri, 07 Mar 2008 20:05:09 +0000 Received: from [195.4.92.18] (helo=8.mx.freenet.de) by mout1.freenet.de with esmtpa (Exim 4.69) (envelope-from ) id 1JXio5-0008Nu-9l for rsgb_lf_group@blacksheep.org; Fri, 07 Mar 2008 21:04:41 +0100 Received: from e180225045.adsl.alicedsl.de ([85.180.225.45]:1244 helo=[192.168.0.111]) by 8.mx.freenet.de with esmtpa (ID dl4yhf@freenet.de) (port 25) (Exim 4.69 #12) id 1JXio5-0000nW-2z for rsgb_lf_group@blacksheep.org; Fri, 07 Mar 2008 21:04:41 +0100 Message-ID: <47D19FD7.6090405@freenet.de> Date: Fri, 07 Mar 2008 21:04:39 +0100 From: =?ISO-8859-1?Q?Wolfgang_B=FCscher?= User-Agent: Thunderbird 2.0.0.12 (Windows/20080213) MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org References: <000901c87ef9$2cd34960$08a3fea9@edgar1ew1re1zt> <47D1150A.6090407@ukonline.co.uk> <000701c88045$c681e740$0301a8c0@g3kev> In-Reply-To: X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,none Subject: Re: LF: SMPS noise cancelling software Content-Type: text/plain; charset=ISO-8859-1; format=flowed 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-IP: 193.82.116.20 X-AOL-SCOLL-AUTHENTICATION: listenair ; SPF_helo : n X-AOL-SCOLL-AUTHENTICATION: listenair ; SPF_822_from : n X-Mailer: Unknown (No Version) Hello Markus and group, Many thanks for that - I have nc3f4 running on my notebook PC now. All that is missing now is an extra "sound-input" utility for the SDR-IQ (which I use for listening on 136 and 500 kHz). SDR-IQ (and also Perseus, which is due to arrive here soon) use non-standard sampling rates, but I am sure your SMPSU-noise-reduction algorithm can work with that, too. Will let you and the group know the results. BTW Does the GM4ISM grabber use your utility, too ? There seems to be less garbage around 506 kHz than there used to be ;-) Cheers, Wolf DL4YHF . Markus Vester schrieb: > Dear LF, > > as our LF and MF receiving is often plaguesd by intense hash from > various switch mode power supplies, I have tried to work towards a > software noise canceller, using estimation and subtraction. A short > description of the technique, along with free experimental software > and sourcecode, can be found on > http://members.aol.com/df6nm2/smps_nc/NC3F4.zip (63 kB). Hope you may > find it useful... > > Kind regards > Markus, DF6NM > > > >