Return-Path: X-Spam-DCC: paranoid 1481; Body=2 Fuz1=2 Fuz2=2 X-Spam-Checker-Version: SpamAssassin 3.1.3 (2006-06-01) on lipkowski.org X-Spam-Level: X-Spam-Status: No, score=-1.4 required=5.0 tests=BAYES_00,DNS_FROM_AHBL_RHSBL, HTML_40_50,HTML_MESSAGE,PLING_QUERY,SPF_PASS,UNPARSEABLE_RELAY autolearn=no version=3.1.3 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by paranoid.lipkowski.org (8.13.7/8.13.7) with ESMTP id uA3Gap6t028773 for ; Thu, 3 Nov 2016 17:36:52 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1c2Kwh-0005rV-Gs for rs_out_1@blacksheep.org; Thu, 03 Nov 2016 16:32:55 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1c2Kwg-0005rM-NI for rsgb_lf_group@blacksheep.org; Thu, 03 Nov 2016 16:32:54 +0000 Received: from nm14-vm5.bullet.mail.ir2.yahoo.com ([212.82.96.193]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.87) (envelope-from ) id 1c2Kwd-0007rV-TH for rsgb_lf_group@blacksheep.org; Thu, 03 Nov 2016 16:32:53 +0000 X-DKIM-Result: Domain=yahoo.co.uk Result=Good and Known Domain DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yahoo.co.uk; s=s2048; t=1478190769; bh=KF8fsWk97ynpJMkH5aWP9McQbVUJTn5HGXS3pjLPmok=; h=Date:From:Reply-To:To:In-Reply-To:References:Subject:From:Subject; b=faETccPtMM37YaUIyh4lyJvsIoKKUBKKVrZKm+aN5OgVNREMQwh3fiuPZPKWDjB4VqIlRRMnoktsUNfLWFxp8/YRhAaVoJhtIx1wa+YDKRhggeajV7QFGdJSPpF43X812gqxnE7vGJUc3QM98YM5K8hIbq4xhcTurN0BfqZbjLh7sPZW4wGnKzCS4TIZDK8Z49y7kidgdT+73I80KVFfvU6B/9q+JI2VRYJcEPi/Pe+kbjERproqYMIwPU3gUPeBmKjjd92PJd12J22VL1mRBgglLA0j94vxWHkWFCpMjaSO7uHGcdK8wo5EZt6w+jdRoDQntJDqWlERMuSMAo8MwA== Received: from [212.82.98.59] by nm14.bullet.mail.ir2.yahoo.com with NNFMP; 03 Nov 2016 16:32:49 -0000 Received: from [212.82.98.94] by tm12.bullet.mail.ir2.yahoo.com with NNFMP; 03 Nov 2016 16:32:49 -0000 Received: from [127.0.0.1] by omp1031.mail.ir2.yahoo.com with NNFMP; 03 Nov 2016 16:32:49 -0000 X-Yahoo-Newman-Property: ymail-3 X-Yahoo-Newman-Id: 153717.42707.bm@omp1031.mail.ir2.yahoo.com X-YMail-OSG: _TkVKfcVM1mIDwsoJGQ7Soj3x2IvwosKBoULiCq9TR8diQnnasQaVJ4xA2ynECB y3TXuLRcPpRUEeSXD8fpfpo73vxG17sUNEpt5E7i1jBh0Qv6fAs9fEarxKKtq_CMqIaPdNVKtd1m gASm6M2X_LR.iSwxH4nFDh3_faz64RjNahPm86zhC3ThVaSKzY87R2xltWIF2lRP8BBHEhDVLnQG yGLzgzGLN4foVF2Q00.gCa.bp3ZKm0qbYM5_0nKmXI0zmj5vjQh72QMuimb3T15lInk1iPVJUM6L VXpSMZqeNEUIp5leVk01WIspst6id2lMrRdJe0wzZP3XeC8rgjOktaKvNwDntxMDFRchga8AGfFK sAE3C6__XfO9khz291KR49ifV9wuWTs57z30XkM0ExoeMQaTmKtRxmHyxJqtuiFJzXU8lHcYvJ0t rgVVdgnGOhj3SLKRZeA2UMRBX85eF8oadxw9gxjLLGurJ3gCqtayUI6TDxFj1tiAJ.b8Pv1hjUfp pA13okpfEJhROV6TeOw1Egw9E9vOczew- Received: from jws700059.mail.ir2.yahoo.com by sendmailws107.mail.ir2.yahoo.com; Thu, 03 Nov 2016 16:32:48 +0000; 1478190768.754 Date: Thu, 3 Nov 2016 16:32:01 +0000 (UTC) From: David Hine To: "rsgb_lf_group@blacksheep.org" Message-ID: <1127299165.1072437.1478190721402@mail.yahoo.com> In-Reply-To: <581B3A1F.5060609@posteo.de> References: <581B3A1F.5060609@posteo.de> MIME-Version: 1.0 X-Scan-Signature: e4d79cc1e5beb0f7c63f6aa3ce129e10 Subject: Re: LF: Smart noise cancelling?!? Content-Type: multipart/alternative; boundary="----=_Part_1072436_518700890.1478190721400" 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-Scanned-By: MIMEDefang 2.56 on 10.1.3.11 Content-Length: 6197 Status: O X-Status: X-Keywords: X-UID: 9369 ------=_Part_1072436_518700890.1478190721400 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Hi Stefan, Although this is a bit different, but also=C2=A0to do with noise= , I bought a very cheap kitchen broadcast=C2=A0radio from Tesco for =C2=A39= . It has=C2=A0 Long Wave on it,=C2=A0and I am amazed it is the only LW=C2= =A0radio I have that can receive all the stations that still are on LW with= out any background noise=C2=A0once a station is tuned in. It can be mains p= owered and next to a computer or TV, and still no=C2=A0local noise!! The mo= del number of this Tesco kitchen=C2=A0radio=C2=A0is RAD - 113B. On tuning t= o a station, it suddenly 'locks on' to it with a small=C2=A0'jump'. Then th= e local noise totally disappears, leaving only the required LW=C2=A0program= me interference free!! Why is this? -could it be the way this very cheap ra= dio detects the signal? If so, the detection=C2=A0method used in this cheap= =C2=A0radio would be very useful for LF work, in which local mains noise is= always a big problem. Perhaps someone here=C2=A0also owns this Tesco=C2=A0= radio, and can answer why it is=C2=A0so quiet indoors where all my other Lo= ng Wave (and much more expensive)=C2=A0receivers are all=C2=A0swamped by lo= cal noise when used indoors?? I hope this is useful. Regards, David.=C2=A0= =C2=A0 From: DK7FC To: "rsgb_lf_group@blacksheep.org" =20 Sent: Thursday, 3 November 2016, 13:22 Subject: LF: Smart noise cancelling?!? =20 Hi all, Last night i thought a bit about noise cancelling on LF/VLF. Depending=20 on the band and distance and strength of the QRN, different settings for=20 a noise blanker are used, or optimal. Different rise times, treshold=20 levels and so on. I thought about propagation changes and different shapes of QRN bursts=20 in the time domain, requiring different blanker settings. Is it possible to program an 'intelligent' noise blanking system that is=20 evaluating the input spectrum, looking at the shape/type of a sferic and=20 automatically sets individual dynamic noise blanker parameters for each=20 burst? Or do i miss something here? Just a thought. I guess i'm not the first one who has this idea :-) 73, Stefan =20 ------=_Part_1072436_518700890.1478190721400 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable
Hi Stefan, Although this i= s a bit different, but also to do with noise, I bought a very cheap ki= tchen broadcast radio from Tesco for =C2=A39. It has  Long Wave o= n it, and I am amazed it is the only LW radio I have that can rec= eive all the stations that still are on LW without any background noise&nbs= p;once a station is tuned in. It can be mains powered and next to a compute= r or TV, and still no local noise!! The model number of this Tesco kit= chen radio is RAD - 113B. On tuning to a station, it suddenly 'lo= cks on' to it with a small 'jump'. Then the local noise totally disapp= ears, leaving only the required LW programme interference free!! Why i= s this? -could it be the way this very cheap radio detects the signal? If s= o, the detection method used in this cheap radio would be very us= eful for LF work, in which local mains noise is always a big problem. Perha= ps someone here also owns this Tesco radio, and can answer why it= is so quiet indoors where all my other Long Wave (and much more expen= sive) receivers are all swamped by local noise when used indoors?= ? I hope this is useful. Regards, David.  

From:= DK7FC <selberdenken@posteo.de>
To: "rsgb_lf_group@blacksheep.org" <rsgb_lf_group@blacks= heep.org>
Sent= : Thursday, 3 November 2016, 13:22
Subject: LF: Smart noise cancelling?!?=

Hi all,

Last night i thought a bit about noi= se cancelling on LF/VLF. Depending
on the band and distance and strengt= h of the QRN, different settings for
a noise blanker are used, or optim= al. Different rise times, treshold
levels and so on.
I thought about= propagation changes and different shapes of QRN bursts
in the time dom= ain, requiring different blanker settings.

Is it possible to program= an 'intelligent' noise blanking system that is
evaluating the input sp= ectrum, looking at the shape/type of a sferic and
automatically sets in= dividual dynamic noise blanker parameters for each
burst?
Or do i mi= ss something here?

Just a thought. I guess i'm not the first one who= has this idea :-)

73, Stefan



<= /div>
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