Return-Path: Received: from mtain-mg06.r1000.mx.aol.com (mtain-mg06.r1000.mx.aol.com [172.29.96.206]) by air-db07.mail.aol.com (v126.13) with ESMTP id MAILINDB072-86214b60a5e8112; Wed, 27 Jan 2010 15:45:28 -0500 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mtain-mg06.r1000.mx.aol.com (Internet Inbound) with ESMTP id B5DB73800008D; Wed, 27 Jan 2010 15:45:26 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1NaEkZ-0004e3-8T for rs_out_1@blacksheep.org; Wed, 27 Jan 2010 20:44:31 +0000 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1NaEkY-0004du-NW for rsgb_lf_group@blacksheep.org; Wed, 27 Jan 2010 20:44:30 +0000 Received: from mail-fx0-f219.google.com ([209.85.220.219]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1NaEkW-0006NK-9h for rsgb_lf_group@blacksheep.org; Wed, 27 Jan 2010 20:44:30 +0000 Received: by fxm19 with SMTP id 19so144736fxm.29 for ; Wed, 27 Jan 2010 12:44:21 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=googlemail.com; s=gamma; h=domainkey-signature:mime-version:received:in-reply-to:references :date:message-id:subject:from:to:content-type; bh=+4axEeN2zV19eRpDpxsr44OiE6slqdwR8Jf5Bs/yjww=; b=L4AUEoQS4DvAnMzYUmcdu/tC12klxShgcUMgjC89SUF5rLx0oj/eqDld/qepGjCCPz axhFk8ywDkh+HUKchp6jxYqyMUJq7DtRUIRxuBBpd5drqlYRYyQ54+5WeEOYiI1kkSGn MWB33wBx0ldf/3KOLyzgPrfwGqYkNaaSF3eB4= DomainKey-Signature: a=rsa-sha1; c=nofws; d=googlemail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type; b=jvlVmqAcD3fN0ehRTLbxGAIPOc7iegzesxvliAIJAV82f8fq3NGM26xMhMfo+MzlmT YAK//QQTDDaZKy9TAhtu/MaMqlL6KX/fFZXHsH6285zkyijxZRlIDyU8wtFA3ZIqgqs+ t7QSSkYS0WGu0jkZZlPHeQ30hmtOa/5Dotat0= MIME-Version: 1.0 Received: by 10.239.180.19 with SMTP id f19mr1191934hbg.35.1264625061337; Wed, 27 Jan 2010 12:44:21 -0800 (PST) In-Reply-To: References: Date: Wed, 27 Jan 2010 20:44:21 +0000 Message-ID: From: Andy Talbot To: rsgb_lf_group@blacksheep.org DomainKey-Status: good (testing) X-Spam-Score: 0.1 (/) X-Spam-Report: autolearn=disabled,HTML_MESSAGE=0.001,HTML_TAG_EXIST_TBODY=0.126 Subject: Re: LF: RE: WSPR Reports Content-Type: multipart/alternative; boundary=001485f5b10e8e1b25047e2b7724 X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.6 required=5.0 tests=HTML_40_50,HTML_MESSAGE, HTML_TAG_EXISTS_TBODY 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-sid: 3039ac1d60ce4b60a5e64dd6 X-AOL-IP: 193.82.116.20 X-Mailer: Unknown (No Version) --001485f5b10e8e1b25047e2b7724 Content-Type: text/plain; charset=ISO-8859-1 All the critical filtering is done in the software, and results in a 1.46Hz noise bandwidth - which is what the software measures and reports upon. Your observation that a narrower IF bandwidth is interesting. Its most likely based on the fact that typical signals are corrupted by pulsed non-gaussian noise which upsets the frequency bin detection process, and upsets sync recovery. Andy www.g4jnt.com This email has been scanned for damaging side-effects by the health and safety police, is guaranteed to contain no substances hazardous to health, but may contribute to dissolving the nether and polar regions 2010/1/27 Rik Strobbe > Andy, > > maybe the "magic" lies in a narrow filter (either IF or audio). > If I switch from a 2.5kHz (SSB) filter to a 270 Hz filter I also get > a significant increase in SNR values reported by WSPR. > Unfortunaely it hardly affects the decoding level (minimal SNR needed to > get a positive decode), that rises by almost the same amount. > > 73, Rik ON7YD - OR7T > ------------------------------ > *Van:* owner-rsgb_lf_group@blacksheep.org [ > owner-rsgb_lf_group@blacksheep.org] namens Andy Talbot [ > andy.g4jnt@googlemail.com] > *Verzonden:* woensdag 27 januari 2010 21:26 > *Aan:* rsgb_lf_group@blacksheep.org > *Onderwerp:* LF: WSPR Reports > > Has F6CNI managed some sort of magic noise reduction system, or is it a > just a case of being in a very quiet location... > These are pretty impressive S/N values > > > 2010-01-27 20:14 G4JNT 0.503875 +13 0 IO90iv +23 0.200 > F6CNI JN19qb 391 243 2010-01-27 20:08 G4JNT 0.503875 +10 > 0 IO90iv +23 0.200 F6CNI JN19qb 391 243 2010-01-27 20:02 > PA0A 0.503900 +15 0 JO33de +37 5.012 F6CNI JN19qb 502 > 312 2010-01-27 20:00 G4JNT 0.503875 +14 0 IO90iv +23 > 0.200 F6CNI JN19qb 391 243 2010-01-27 19:54 G7NKS 0.503920 > -5 0 IO92ub +20 0.100 F6CNI JN19qb 422 262 2010-01-27 > 19:54 G4JNT 0.503875 +14 0 IO90iv +23 0.200 F6CNI > JN19qb 391 243 2010-01-27 19:44 G4JNT 0.503875 +10 0 > IO90iv +23 0.200 F6CNI JN19qb 391 243 2010-01-27 19:40 > PA0A 0.503900 +15 0 JO33de +37 5.012 F6CNI JN19qb 502 > 312 > > > Andy > www.g4jnt.com > > --001485f5b10e8e1b25047e2b7724 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
All the critical filtering is done in the software, and results in a= 1.46Hz noise bandwidth - which is what the software measures and reports= upon.
=A0
Your observation that a narrower IF bandwidth is interesting.=A0=A0= Its most likely based on the fact that typical signals are corrupted by= pulsed non-gaussian noise which upsets the frequency bin detection proces= s, and upsets sync recovery.
=A0

Andy
www.g4jnt.= com

This email has been scanned for damaging side-effects by th= e health and safety police, is guaranteed to contain no substances hazardo= us to health, but may contribute to dissolving the nether and polar region= s


2010/1/27 Rik Strobbe <Rik.Strobbe@fys.kuleuven.be>
Andy,<= /font>
=A0
maybe=A0the "magic&= quot; lies in a narrow filter (either IF or audio).
If I switch from a 2.5kH= z (SSB) filter to a 270 Hz filter I also get a=A0significant increase in= SNR values reported by WSPR.
Unfortunaely it hardly= affects the decoding level (minimal SNR needed to get a positive decode),= that rises by almost the same amount.
=A0
73, Rik=A0 ON7YD - OR7T<= /font>
Van: owner-rsgb_lf_group@blacksheep.= org [owner-rsgb_lf_group@blacksheep.org] namens Andy Talbot [andy.g4jnt@googlem= ail.com]
Verzonden: woensdag 27 januari 2010 21:26
Aan: rsgb_lf_group@blac= ksheep.org
Onderwerp: LF: WSPR Reports

Has F6CNI managed some sort of magic noise reduction system, or is it= a just a case of being in a very quiet location...
These are pretty impressive S/N values
=A0
=A0
=A02010-01-27 20:14=A0 =A0G4JNT=A0 =A00.503875=A0 =A0+13=A0 =A00=A0 =A0IO90iv=A0 =A0+23=A0 =A00.200=A0 =A0F6CNI=A0 =A0JN19qb=A0 =A0391=A0 =A0243=A0
=A02010-01-27 20:08=A0 =A0G4JNT=A0 =A00.503875=A0 =A0+10=A0 =A00=A0 =A0IO90iv=A0 =A0+23=A0 =A00.200=A0 =A0F6CNI=A0 =A0JN19qb=A0 =A0391=A0 =A0243=A0
=A02010-01-27 20:02=A0 =A0PA0A=A0 =A00.503900=A0 =A0+15=A0 =A00=A0 =A0JO33de=A0 =A0+37=A0 =A05.012=A0 =A0F6CNI=A0 =A0JN19qb=A0 =A0502=A0 =A0312=A0
=A02010-01-27 20:00=A0 =A0G4JNT=A0 =A00.503875=A0 =A0+14=A0 =A00=A0 =A0IO90iv=A0 =A0+23=A0 =A00.200=A0 =A0F6CNI=A0 =A0JN19qb=A0 =A0391=A0 =A0243=A0
=A02010-01-27 19:54=A0 =A0G7NKS=A0 =A00.503920=A0 =A0-5=A0 =A00=A0 =A0IO92ub=A0 =A0+20=A0 =A00.100=A0 =A0F6CNI=A0 =A0JN19qb=A0 =A0422=A0 =A0262=A0
=A02010-01-27 19:54=A0 =A0G4JNT=A0 =A00.503875=A0 =A0+14=A0 =A00=A0 =A0IO90iv=A0 =A0+23=A0 =A00.200=A0 =A0F6CNI=A0 =A0JN19qb=A0 =A0391=A0 =A0243=A0
=A02010-01-27 19:44=A0 =A0G4JNT=A0 =A00.503875=A0 =A0+10=A0 =A00=A0 =A0IO90iv=A0 =A0+23=A0 =A00.200=A0 =A0F6CNI=A0 =A0JN19qb=A0 =A0391=A0 =A0243=A0
=A02010-01-27 19:40=A0 =A0PA0A=A0 =A00.503900=A0 =A0+15=A0 =A00=A0 =A0JO33de=A0 =A0+37=A0 =A05.012=A0 =A0F6CNI=A0 =A0JN19qb=A0 =A0502=A0 =A0312=A0
=A0
--001485f5b10e8e1b25047e2b7724--