Return-Path: Received: from rly-dg12.mx.aol.com (rly-dg12.mail.aol.com [172.19.151.96]) by air-dg06.mail.aol.com (v125.7) with ESMTP id MAILINDG062-60c4aba905f79; Wed, 23 Sep 2009 17:17:31 -0400 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by rly-dg12.mx.aol.com (v125.7) with ESMTP id MAILRELAYINDG123-60c4aba905f79; Wed, 23 Sep 2009 17:17:21 -0400 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1MqZCW-0001By-Q7 for rs_out_1@blacksheep.org; Wed, 23 Sep 2009 22:16:36 +0100 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1MqZCW-0001Bp-9j for rsgb_lf_group@blacksheep.org; Wed, 23 Sep 2009 22:16:36 +0100 Received: from smtp818.mail.ird.yahoo.com ([77.238.189.18]) by relay1.thorcom.net with smtp (Exim 4.63) (envelope-from ) id 1MqZBJ-00036B-FI for rsgb_lf_group@blacksheep.org; Wed, 23 Sep 2009 22:15:22 +0100 Received: (qmail 3866 invoked from network); 23 Sep 2009 21:16:20 -0000 DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=s1024; d=btinternet.com; h=Received:X-Yahoo-SMTP:X-YMail-OSG:X-Yahoo-Newman-Property:From:To:Subject:Date:Message-ID:MIME-Version:Content-Type:X-Priority:X-MSMail-Priority:X-Mailer:In-Reply-To:Importance:Thread-Index:X-MimeOLE; b=1g0uZ3DrsBpYcvBJiWOMgWWnPvFy6ZvyZaeag/sycjcCpAjtcoJQ3ZcNw4e1Lg7Exv8Nl66AAi99L1LhEo9ZYTlvGDAp5armtAZd9KcpGFITExuLyTwmriib5YgflxA7b2oVR/KyckmpaYZaVfg2eYlhoN8OqNJEIo8vpUuRzVQ= ; Received: from unknown (HELO Inspiron) (hudsonville@86.146.201.100 with login) by smtp818.mail.ird.yahoo.com with SMTP; 23 Sep 2009 21:16:20 -0000 X-Yahoo-SMTP: T9P8HheswBCXVWXq3ajpBY99bVSvRxQZ2abOUyeQ53_fqQzzpx0V X-YMail-OSG: hh.chSYVM1l6qTgMP4YcvQ8FOARdxTJTUVx.mY4GtovrReTNVtQprOZW9OmtQVGMIhNBnyaFUJHYxJTQ2ixpu_BYnRiqdkKEY.eGhg3DmY1Z.zdUmMn3ZbIZC6gVo8tMr6FkieErIjoZIVHVt6DBi7IPE4Tf1xU56O5Li.4ZdLFI5wwtdQ4R0D5cGSUNuE3ink3Uyp4SCUY9SpC_VOhBDZ1mwLVnXYhvxFe8j9yLGpj4zw-- X-Yahoo-Newman-Property: ymail-3 From: "Lee Hudson" To: Date: Wed, 23 Sep 2009 22:16:20 +0100 Message-ID: MIME-Version: 1.0 X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6838 In-Reply-To: Importance: Normal Thread-Index: Aco8jl+T5PWfWgqkTNiE7Own4EkxRQAAUisg X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.5579 X-Karma: unknown: DomainKey-Status: good (testing) X-Spam-Score: 3.4 (+++) X-Spam-Report: autolearn=disabled,FORGED_MUA_OUTLOOK=3.36,HTML_MESSAGE=0.001 Subject: LF: RE: s/n shown by wspr .... what is it actually showing ? Content-Type: multipart/alternative; boundary="----=_NextPart_000_001A_01CA3C9B.7AB4B0E0" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: ** X-Spam-Status: No, hits=2.2 required=5.0 tests=FORGED_MUA_OUTLOOK,HTML_40_50, HTML_FONTCOLOR_BLUE,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-IP: 193.82.116.20 ------=_NextPart_000_001A_01CA3C9B.7AB4B0E0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Hi Graham, LF, =20 Well here looking at WSPR with Spectrum Lab running the other week I= came to the conclusion that: =20 1. Adjusting the input level to the PC such that WSPR indicates a Nois= e level of 0dB corresponds to -60dBfs in Spectrum Lab. 2. A signal reported as -30dB in WSPR will measure -60dBfs in Spectrum= Lab, and be indistingushable from the noise. 3. A signal reported as 0dB in WSPR will measure -30dBfs in Spectrum= Lab 4. A signal reported as +10dB will measure -20dBfs in Spectrum Lab. 5. Raising the Noise level reported by WSPR to +10dB will correspond= to -50dBfs in Spectrum Lab. But this only reduces the dynamic range of WS= PR. =20 To me it appears WSPR prefers the Noise floor to be around -60dBfs giv= ing it a 30dB margin over the A/D theoretical noise floor. =20 These tests were done during the day, when there was little QRN and QS= B. AGC off, and sufficient RF attenuation to achieve 0dB Noise level repo= rted by WSPR. =20 73, Lee M0LMH. =20 =20 =20 -----Original Message----- From: owner-rsgb_lf_group@blacksheep.org [mailto:owner-rsgb_lf_group@blacksheep.org] On Behalf Of Graham Sent: 23 September 2009 21:41 To: rsgb_lf_group@blacksheep.org Subject: LF: s/n shown by wspr .... what is it actually showing ? Just watched Dave's G3YXM wspr signal on spec-lab ,=20 =20 Spec-lab showed the signal to be a constant 20 dB over the back gro= und noise floor of the rx=20 so in my book that's 20 dB s/n =20 =20 The wspr decode is showing -3 dB s/n ? =20 What is it actually displaying ? =20 G ..=20 =20 =20 =20 No virus found in this incoming message. Checked by AVG - www.avg.com Version: 8.5.409 / Virus Database: 270.13.112/2390 - Release Date: 09/= 23/09 05:52:00 ------=_NextPart_000_001A_01CA3C9B.7AB4B0E0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message
Hi=20 Graham, LF,
 
Well=20 here looking at WSPR with Spectrum Lab running the other week I came= to the=20 conclusion that:
 
1.=20 Adjusting the input level to the PC such that WSPR indicates a Noise= level of=20 0dB corresponds to -60dBfs in Spectrum Lab.
2. A=20 signal reported as -30dB in WSPR will measure -60dBfs in Spectrum Lab,= and be=20 indistingushable from the noise.
3. A signal reported as 0dB in WSPR will= measure=20 -30dBfs in Spectrum Lab
4. A=20 signal reported as +10dB will measure -20dBfs in Spectrum=20 Lab.
5.=20 Raising the Noise level reported by WSPR to +10dB will correspond to= -50dBfs in=20 Spectrum Lab. But this only reduces the dynamic range of=20 WSPR.
 
To me=20 it appears WSPR prefers the Noise floor to be around -60dBfs giving it= a 30dB=20 margin over the A/D theoretical noise floor.
 
These=20 tests were done during the day, when there was little QRN and=20 QSB.
AGC=20 off, and sufficient RF attenuation to achieve 0dB Noise level reported= by=20 WSPR.
 
73,
Lee=20 M0LMH.
 
 
 
-----Original Message-----
Fro= m:=20 owner-rsgb_lf_group@blacksheep.org [mailto:owner-rsgb_lf_group@black= sheep.org]=20 On Behalf Of Graham
Sent: 23 September 2009=20 21:41
To: rsgb_lf_group@blacksheep.org
Subject:= LF: s/n=20 shown by wspr .... what is it actually showing ?
Just watched Dave's G3YXM  wsp= r  signal=20 on spec-lab ,
 
Spec-lab showed the  signal to=   be a=20 constant  20 dB over the back ground noise floor  of the&n= bsp; rx=20
so in my  book that's 20 dB&nb= sp;=20 s/n  
 
The  wspr  decode is = ; showing -3=20 dB s/n ?
 
What is it  actually  dis= playing=20 ?
 
G ..
 
 
 

No virus found in this incoming messa= ge.
Checked=20 by AVG - www.avg.com
Version: 8.5.409 / Virus Database: 270.13.11= 2/2390 -=20 Release Date: 09/23/09 05:52:00

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