Return-Path: Received: from mtain-de09.r1000.mx.aol.com (mtain-de09.r1000.mx.aol.com [172.29.64.209]) by air-md10.mail.aol.com (v129.4) with ESMTP id MAILINMD102-8b994cd6633d1c5; Sun, 07 Nov 2010 03:28:45 -0500 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-de09.r1000.mx.aol.com (Internet Inbound) with ESMTP id DEAEB38000094; Sun, 7 Nov 2010 03:27:09 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1PF0Yz-00028B-Rn for rs_out_1@blacksheep.org; Sun, 07 Nov 2010 08:25:21 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1PF0Yz-000282-8o for rsgb_lf_group@blacksheep.org; Sun, 07 Nov 2010 08:25:21 +0000 Received: from smtp824.mail.ukl.yahoo.com ([217.12.12.9]) by relay1.thorcom.net with smtp (Exim 4.63) (envelope-from ) id 1PF0Yx-0002lV-IA for rsgb_lf_group@blacksheep.org; Sun, 07 Nov 2010 08:25:21 +0000 Received: (qmail 31034 invoked from network); 7 Nov 2010 08:25:13 -0000 DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=s1024; d=btopenworld.com; h=DKIM-Signature: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:X-MimeOLE:Importance:In-Reply-To; b=XU1YKUMrVbxJn6m7hXTgvUt6jYtO/cYUEZd/rhGNNM/BYR0BGT+jQUKswq504l8jmxJepjxt2wFgWdmZhiHA1l8fcd/N6PNj1nbXI4xW7JRdV/F819NOnmhry7buL4zEAd7LnK6zBPgJnQNn8cd+l2k7WC9RO+UcArS8mQo+ZCs= ; DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=btopenworld.com; s=s1024; t=1289118313; bh=YpD6namuuQboFpkiQIA0WImgTxGrhGGr7zF0qY4b62g=; 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:X-MimeOLE:Importance:In-Reply-To; b=EQOPORqtK6vvQItf+rosZqgILQarX3+uIV/Fq55UkooibTXxqYow3j+LbwS0GCxTLr5by9iCl0bG1VkELAJD2bNOeKZMpn9KJDvo7UNmhPkRNa1vvvRVF6+9TJAiN8pxLSeTKL3onGI0DNcX+1nlsn/Na9pI9Dxi/1Wf2G2HprU= Received: from taurids (ganymede444@81.157.28.239 with login) by smtp824.mail.ukl.yahoo.com with SMTP; 07 Nov 2010 08:25:13 +0000 GMT X-Yahoo-SMTP: c8dPawiswBBxxmjSAvmKGJq150SoSoD6d8MTABSG9Now_xuQLZ9d X-YMail-OSG: qK3dLfMVM1kUIRApoh5SDjsFkjSdj5dMRtCWOc8_dp0sNoi zLOUiMLQZHVgdehmL31Qk8igPb7XaIosWtgYh6yC_9cG4tQiyFCuMMm31ect bSQuUcTVtRAm.FT3YeisgeQJqrZ.wWl4x.TQgg7zW2.WElCf5CQrVD.dPmee A4PQ0uif.XLNol5zEe356n3ms.mGrDc94xTY5mfZhP.LuDaVArMMLsGxWA6k K3yzJND7xCR45Xvdw_xhBQTaChAQqD7sy6.ofUFz6TaI1TDLqDszOpcY4ZEM cjVACDNTceriz38vPjEgkztw5uK0B2FsRSWsaajCcQ8M- X-Yahoo-Newman-Property: ymail-3 From: "Dave G3WCB." To: Date: Sun, 7 Nov 2010 08:25:11 -0000 Message-ID: MIME-Version: 1.0 X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook IMO, Build 9.0.2416 (9.0.2911.0) X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Importance: Normal In-Reply-To: <757DB8D43CC8484EBD4F32B50517A7A3@AGB> DomainKey-Status: good (testing) X-Spam-Score: 0.3 (/) X-Spam-Report: autolearn=disabled,HTML_MESSAGE=0.001,MAILTO_TO_SPAM_ADDR=0.276,UNPARSEABLE_RELAY=0.001 Subject: Wideband Noise on 500 kHz [was RE: LF: WD2XSH/17 on WSPR] Content-Type: multipart/alternative; boundary="----=_NextPart_000_0004_01CB7E55.4BBE6540" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: ** X-Spam-Status: No, hits=2.5 required=5.0 tests=FROM_ENDS_IN_NUMS,HTML_40_50, HTML_FONTCOLOR_BLUE,HTML_MESSAGE,MAILTO_TO_SPAM_ADDR 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-SCOLL-AUTHENTICATION: mail_rly_antispam_dkim-d223.1 ; domain : btopenworld.com DKIM : pass x-aol-sid: 3039ac1d40d14cd662dd3a0f X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none ------=_NextPart_000_0004_01CB7E55.4BBE6540 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Graham, LF, I checked the wideband noise at midnight last night with my SPM-30 (3 kHz bandwidth). It was clearly audible, and had the sort of buzz-saw rumble that one finds on HF occasionally. The levels were:- 496.0 kHz - 81 dBm 500.0 kHz - 73dBm 504.0 kHz - 83 dBm So it's about 8 to 10 dB above my local background noise level :-( No WSPR stations copied last night on 501 kHz. 73, Dave G3WCB IO91RM nr Windsor, S.E. England -----Original Message----- From: owner-rsgb_lf_group@blacksheep.org [mailto:owner-rsgb_lf_group@blacksheep.org]On Behalf Of Graham Sent: 06 November 2010 13:22 To: rsgb_lf_group@blacksheep.org Subject: Re: LF: WD2XSH/17 on WSPR Dave, I think the sharp cut-off is the only elegant part of it ? , using spec-lab , I can see a drop of 10 to 15 dB over 502 KHz .. suppose its a good place to try data modes out .. interestingly , wspr is not producing any false decodes and the WD signal decoded twice , which I think is actually times 4 decodes , round 2400 z , but may be the s/n distorted by the noise floor increase ? my 100 watts crossed once , but gave a better s/n There may be a possibility , that you are inside the skip range and out of the ground 75/100 mile range ..? I see a couple of S points on the meter as I tune over the noise ..marvellous .. and the pulse modulated Christmas lights are yet to come ...... hum-bug 73-G. From: Dave G3WCB. Sent: Saturday, November 06, 2010 12:43 PM To: rsgb_lf_group@blacksheep.org Subject: RE: LF: WD2XSH/17 on WSPR Hi, Graham. It's probably contributing to the overall high level of crud at this QTH, but I'm not aware of exactly how much it is adding. I'll do some tests over the week-end and try to measure the contribution. >From what I've seen on the various grabbers, it seems to have a fairly well-defined H F cut-off, so it should be easy to identify where the wideband datalink noise ends and the usual hash continues. Cheers Dave -----Original Message----- From: owner-rsgb_lf_group@blacksheep.org [mailto:owner-rsgb_lf_group@blacksheep.org]On Behalf Of Graham Sent: 06 November 2010 11:07 To: rsgb_lf_group@blacksheep.org Subject: Re: LF: WD2XSH/17 on WSPR Dave, Do you see the wide band noise at + 10 to +15 dB over the background noise ? G.. From: Dave G3WCB. Sent: Saturday, November 06, 2010 8:23 AM To: rsgb_lf_group@blacksheep.org ; GQRP@yahoogroups.com Subject: LF: WD2XSH/17 on WSPR I snagged WD2XSH/17 last night on WSPR. This is pretty good going for this QTH, as I have a very high local noise level on 500 kHz. 2010-11-06 04:06 WD2XSH/17 0.501091 -27 0 FN42pb +30 1.000 G3WCB IO91rm 5233 3252 73, Dave G3WCB IO91RM nr Windsor, S.E.England ------=_NextPart_000_0004_01CB7E55.4BBE6540 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Graham, LF,
 
I=20 checked the wideband noise at midnight last night with my SPM-30 (3 kH= z=20 bandwidth). It was clearly audible, and had the sort of buzz-saw rumbl= e that one=20 finds on HF occasionally. The levels were:-
496.0 kHz    - 81=20 dBm
500.0 kHz    -=20 73dBm
504.0 kHz    - 83=20 dBm
=
So=20 it's about 8 to 10 dB above my local background noise level=20 :-(
 
No=20 WSPR stations copied last night on 501 kHz.
 
73,=20 Dave G3WCB IO91RM nr Windsor, S.E. England
-----Original Message-----
From:=20 owner-rsgb_lf_group@blacksheep.org=20 [mailto:owner-rsgb_lf_group@blacksheep.org]On Behalf Of=20 Graham
Sent: 06 November 2010 13:22
To:=20 rsgb_lf_group@blacksheep.org
Subject: Re: LF: WD2XSH/17 on= =20 WSPR

Dave,
 
I think the  sharp cut-off&nbs= p;  is=20 the only elegant  part of it ? , using  spec-lab , I can&n= bsp; see=20 a  drop  of 10  to 15 dB over 502 KHz .. suppose its= a=20 good  place to  try data modes out .. interestingly , wspr= is=20 not  producing any  false  decodes and the  WD= =20 signal  decoded  twice , which I think is =20 actually  times 4 decodes , round  2400 z , but may= be=20 the  s/n  distorted by the  noise floor increase ? my= 100=20 watts  crossed once , but  gave a  better s/n =
 
There  may be a possibility ,= that you=20 are  inside the  skip  range and out of the  gro= und =20 75/100  mile  range ..?
 
I see  a  couple of S poi= nts on=20 the  meter as I tune over the  noise ..marvellous .. and= =20 the  pulse modulated  Christmas  lights are = ; yet=20 to  come   ...... hum-bug
 
73-G.

Sent: Saturday, November 06, 2010 12:43 PM
Subject: RE: LF: WD2XSH/17 on WSPR

Hi,=20 Graham.
 
It's=20 probably contributing to the overall high level of crud at this QTH,= but I'm=20 not aware of exactly how much it is adding.
 
I'll=20 do some tests over the week-end and try to measure the contribution.= From what=20 I've seen on the various grabbers, it seems to have a fairly well-de= fined H F=20 cut-off, so it should be easy to identify where the wideband datalin= k noise=20 ends and the usual hash continues.
 
Cheers
 
Dave
-----Original Message-----
From:= =20 owner-rsgb_lf_group@blacksheep.org=20 [mailto:owner-rsgb_lf_group@blacksheep.org]On Behalf Of=20 Graham
Sent: 06 November 2010 11:07
To:=20 rsgb_lf_group@blacksheep.org
Subject: Re: LF: WD2XSH/17= on=20 WSPR

Dave,
 
Do you  see  the wide= band noise=20  at  + 10 to  +15 dB over the  background = ; noise ?=20
 
G..
 

Sent: Saturday, November 06, 2010 8:23 AM
Subject: LF: WD2XSH/17 on WSPR

I=20 snagged WD2XSH/17 last night on WSPR. This is pretty good going fo= r this=20 QTH, as I have a very high local noise level on 500 kHz.
2010-11-06 04:06  WD2XSH/17 =  0.501091  -27  0 &n= bsp;FN42pb  +30 <= TD align=3D"right"> 1.000  G3WCB  IO91rm&nb= sp; 5233  3252  
 
73, Dave G3WCB IO91RM nr Windsor,=20 S.E.England




------=_NextPart_000_0004_01CB7E55.4BBE6540--