Return-Path: Received: from mtain-db10.r1000.mx.aol.com (mtain-db10.r1000.mx.aol.com [172.29.64.94]) by air-mf06.mail.aol.com (v126.13) with ESMTP id MAILINMF062-8bee4b4a1f0c309; Sun, 10 Jan 2010 13:40:12 -0500 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mtain-db10.r1000.mx.aol.com (Internet Inbound) with ESMTP id 343F938000047; Sun, 10 Jan 2010 13:40:10 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1NU2gd-0003yV-C7 for rs_out_1@blacksheep.org; Sun, 10 Jan 2010 18:38:51 +0000 Received: from [83.244.159.144] (helo=relay3.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1NU2gc-0003yM-NF for rsgb_lf_group@blacksheep.org; Sun, 10 Jan 2010 18:38:50 +0000 Received: from mtaout01-winn.ispmail.ntl.com ([81.103.221.47]) by relay3.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1NU2ga-0000AH-R8 for rsgb_lf_group@blacksheep.org; Sun, 10 Jan 2010 18:38:50 +0000 Received: from know-smtpout-4.server.virginmedia.net ([62.254.123.4]) by mtaout01-winn.ispmail.ntl.com (InterMail vM.7.08.04.00 201-2186-134-20080326) with ESMTP id <20100110183343.SGSG17029.mtaout01-winn.ispmail.ntl.com@know-smtpout-4.server.virginmedia.net> for ; Sun, 10 Jan 2010 18:33:43 +0000 Received: from [86.26.81.210] (helo=desktop) by know-smtpout-4.server.virginmedia.net with esmtp (Exim 4.63) (envelope-from ) id 1NU2be-0007Xh-Ra for rsgb_lf_group@blacksheep.org; Sun, 10 Jan 2010 18:33:43 +0000 From: "James Cowburn" To: Date: Sun, 10 Jan 2010 18:33:37 -0000 Message-ID: <000e01ca9223$6d16ec90$0517aac0@desktop> MIME-Version: 1.0 X-Mailer: Microsoft Office Outlook 11 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3350 Thread-Index: AcqSI2w7V0oc15S3Qo225FAoj/N5Lg== X-Cloudmark-Analysis: v=1.1 cv=W3tOLUehizD4qj6VhtReFuw5MKb8d+XqjIxlDsIazEA= c=1 sm=0 a=2mUFhwNqzJQA:10 a=8RloEfZUAAAA:8 a=OiQawdtgaccNZheUQokA:9 a=HTl06DLUKyM5YZfpKVUA:7 a=C1YrGwgDrixO77fP2C6Psppn_CMA:4 a=O58u2wXj750A:10 a=SSmOFEACAAAA:8 a=G3dQBCxLzhpWgqxEyn4A:9 a=h_ERAkuwbmRxQJVrXPwA:7 a=ZSXlzESiJLnISvkTJ3tSdMk0EXEA:4 a=HpAAvcLHHh0Zw7uRqdWCyQ==:117 X-Spam-Score: 0.3 (/) X-Spam-Report: autolearn=disabled,HTML_FONT_BIG=0.256,HTML_MESSAGE=0.001 Subject: LF: Link budget calculation or estimation of dist for given power on WSPR Content-Type: multipart/alternative; boundary="----=_NextPart_000_000F_01CA9223.6D16EC90" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.3 required=5.0 tests=HTML_60_70, HTML_FONTCOLOR_UNKNOWN,HTML_FONT_BIG,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-global-disposition: S x-aol-sid: 3039ac1d405e4b4a1f0a4169 X-AOL-IP: 193.82.116.20 ------=_NextPart_000_000F_01CA9223.6D16EC90 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Dear LF, Has anyone any ideas or suggestions on a resource for calculation of a link budget for WSPR over a set distance? As it seems I can get up to GM4SLV reasonably consistently on my current antenna/power setting with a SNR of around -22dB and the limit for WSPR is around -30dB then is there a means for roughly estimating or indeed accurately calculating the Expected Max Range (EMR) at that power setting and antenna configuration? Clearly, there are differences between separate Rx stations but if one knows the ratio between two or more Rx stations then it should be possible to pro-rate or estimate at least the signal strength at a given Rx based on its performance with other known signals. If I can do 916km with an SNR of say -22dB then how much further would the remaining 8dB or so of WSPR detection get me, assuming the other Rx has the same capability as GM4SLV and if their capability is different, then is it fine to factor for the dB difference over known paths/signals? Thanks in advance for any answers or pointers and best wishes to all for a great 2010 With best regards Jim Dr. James Cowburn G7NKS E james.cowburn@virgin.net ------=_NextPart_000_000F_01CA9223.6D16EC90 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

 Dear LF,

Has anyone any ideas or suggestions on a resource for calculation of a link budget fo= r WSPR over a set distance?

As it seems I can get up to GM4SLV reasonably consistently on my current antenna/power= setting with a SNR of around -22dB and the limit for WSPR is around -30dB then= is there a means for roughly estimating or indeed accurately calculating the Ex= pected Max Range (EMR) at that power setting and antenna configuration?<= /o:p>

Clearly, there are differences between separate Rx stations but if one knows the ratio be= tween two or more Rx stations then it should be possible to pro-rate or estimate= at least the signal strength at a given Rx based on its performance with other= known signals.

If I can do 916km with an SNR of say -22dB then how much further would the remaining &nb= sp;8dB or so of WSPR detection get me, assuming the other Rx has the same capabi= lity as GM4SLV and if their capability is different, then is it fine to factor= for the dB difference over known paths/signals?

Thanks in advance for any answers or pointers and best wishes to all for a great 2010

With best regards=

 

 

Jim

 

 

Dr. James Cowbu= rn G7NKS

E james.cowburn@virgin.net

 

 

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