Return-Path: Received: from mtain-ma07.r1000.mx.aol.com (mtain-ma07.r1000.mx.aol.com [172.29.96.15]) by air-dc06.mail.aol.com (v126.13) with ESMTP id MAILINDC062-862a4b60afd684; Wed, 27 Jan 2010 16:27:50 -0500 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mtain-ma07.r1000.mx.aol.com (Internet Inbound) with ESMTP id 143893800019B; Wed, 27 Jan 2010 16:27:46 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1NaFPc-0005QC-9L for rs_out_1@blacksheep.org; Wed, 27 Jan 2010 21:26:56 +0000 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1NaFPb-0005Q2-Mg for rsgb_lf_group@blacksheep.org; Wed, 27 Jan 2010 21:26:55 +0000 Received: from cavuit02.kulnet.kuleuven.be ([134.58.240.44]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1NaFPZ-0006uL-BQ for rsgb_lf_group@blacksheep.org; Wed, 27 Jan 2010 21:26:55 +0000 Received: from smtps02.kuleuven.be (smtpshost02.kulnet.kuleuven.be [134.58.240.75]) by cavuit02.kulnet.kuleuven.be (Postfix) with ESMTP id C474051C003 for ; Wed, 27 Jan 2010 22:26:42 +0100 (CET) Received: from ICTS-S-HUB-N2.luna.kuleuven.be (icts-s-hub-n2.luna.kuleuven.be [10.112.9.12]) by smtps02.kuleuven.be (Postfix) with ESMTP id B54AAF3862 for ; Wed, 27 Jan 2010 22:26:42 +0100 (CET) Received: from ICTS-S-EXC2-CA.luna.kuleuven.be ([10.112.11.13]) by ICTS-S-HUB-N2.luna.kuleuven.be ([10.112.9.12]) with mapi; Wed, 27 Jan 2010 22:26:42 +0100 X-Kuleuven: This mail passed the K.U.Leuven mailcluster From: Rik Strobbe To: "rsgb_lf_group@blacksheep.org" Date: Wed, 27 Jan 2010 22:26:42 +0100 Thread-Topic: LF: RE: WSPR Reports Thread-Index: Acqfkl/WM5oaYw4eTymcmExnrJ45LQABEMXY Message-ID: References: , In-Reply-To: Accept-Language: nl-NL, nl-BE Content-Language: nl-BE X-MS-Has-Attach: X-MS-TNEF-Correlator: acceptlanguage: nl-NL, nl-BE MIME-Version: 1.0 X-KULeuven-Information: Katholieke Universiteit Leuven X-KULeuven-Scanned: Found to be clean X-KULeuven-Envelope-From: rik.strobbe@fys.kuleuven.be 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="_000_BF4A524700075746A6467658DFC7102C1284D4B32AICTSSEXC2CAlu_" 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,TO_ADDRESS_EQ_REAL 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: 3039ac1d600f4b60afd22b51 X-AOL-IP: 193.82.116.20 X-Mailer: Unknown (No Version) --_000_BF4A524700075746A6467658DFC7102C1284D4B32AICTSSEXC2CAlu_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Andy, I am using a Kenwood TS440 where the AGC cannot be disabled. Strong signal= s and/or QRM-QRN ofter affect the AGC, but far less at 270Hz bandwidth. Maybe the AGC action affects on the reported SNR values. I believe that Andy (F6CNI) also is on the reflector, so he might reveal= the secret. 73, Rik ON7YD - OR7T ________________________________ Van: owner-rsgb_lf_group@blacksheep.org [owner-rsgb_lf_group@blacksheep.or= g] namens Andy Talbot [andy.g4jnt@googlemail.com] Verzonden: woensdag 27 januari 2010 21:44 Aan: rsgb_lf_group@blacksheep.org Onderwerp: Re: LF: RE: WSPR Reports All the critical filtering is done in the software, and results in a 1.46H= z 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 upse= ts sync recovery. Andy www.g4jnt.com This email has been scanned for damaging side-effects by the health and sa= fety 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 sig= nificant 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 ju= st 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 --_000_BF4A524700075746A6467658DFC7102C1284D4B32AICTSSEXC2CAlu_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Andy,<= /font>
 
I am using a Kenwood TS4= 40 where the AGC cannot be disabled. Strong signals and/or QRM-QRN ofter= affect the AGC, but far less at 270Hz bandwidth.
Maybe the AGC action&nbs= p;affects on the reported SNR values.
 
I believe that Andy (F6C= NI) also is on the reflector, so he might reveal the secret.
 
73, Rik  ON7YD - OR= 7T
 
 
Van: owner-rsgb_lf_group@blackshee= p.org [owner-rsgb_lf_group@blacksheep.org] namens Andy Talbot [andy.g4jnt@= googlemail.com]
Verzonden: woensdag 27 januari 2010 21:44
Aan: rsgb_lf_group@blacksheep.org
Onderwerp: Re: LF: RE: WSPR Reports

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. &n= bsp; Its most likely based on the fact that typical signals are corrupted= by pulsed non-gaussian noise which upsets the frequency bin detection pro= cess, and upsets sync recovery.
 

Andy
www.g4jnt.com

This email has been scanned for damaging side-effects by the health and sa= fety 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 <Rik.Strobbe@fys.kuleuven.be>
Andy,<= /font>
 
maybe the "mag= ic" 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 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 - OR= 7T
Van: owner-rsgb_lf_group@blacksheep.org [owner-rsgb_lf_group@blacksheep.org] namens Andy Ta= lbot [andy.g4jnt@googlemail.c= om]
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 
 

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