Return-Path: Received: from rly-dg12.mx.aol.com (rly-dg12.mail.aol.com [172.19.151.96]) by air-dg01.mail.aol.com (v125.7) with ESMTP id MAILINDG012-60b4ad2fd49357; Mon, 12 Oct 2009 05:56:40 -0400 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by rly-dg12.mx.aol.com (v125.7) with ESMTP id MAILRELAYINDG122-60b4ad2fd49357; Mon, 12 Oct 2009 05:56:28 -0400 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1MxHck-0005hw-3q for rs_out_1@blacksheep.org; Mon, 12 Oct 2009 10:55:26 +0100 Received: from [83.244.159.144] (helo=relay3.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1MxHcj-0005hn-DR for rsgb_lf_group@blacksheep.org; Mon, 12 Oct 2009 10:55:25 +0100 Received: from mtaout01-winn.ispmail.ntl.com ([81.103.221.47]) by relay3.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1MxHcW-0003bj-PT for rsgb_lf_group@blacksheep.org; Mon, 12 Oct 2009 10:55:15 +0100 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 <20091012095506.LMSA17029.mtaout01-winn.ispmail.ntl.com@know-smtpout-4.server.virginmedia.net> for ; Mon, 12 Oct 2009 10:55:06 +0100 Received: from [86.26.59.250] (helo=jimdesk) by know-smtpout-4.server.virginmedia.net with esmtp (Exim 4.63) (envelope-from ) id 1MxHcQ-0003Vz-Fo for rsgb_lf_group@blacksheep.org; Mon, 12 Oct 2009 10:55:06 +0100 From: "James Cowburn" To: References: <1f0624b90910111111k48dbc99w46338e723f3684fb@mail.gmail.com> <024801ca4a9f$9f087eb0$0217aac0@jimdesk> <1f0624b90910111149k603e367dha9a95025b21d6f42@mail.gmail.com> <1f0624b90910111404s1260d39ehe005ef7eda670e92@mail.gmail.com> <72445CC346B9474683C65741E109FED9@JimPC> <1f0624b90910120239u3b2c82fexa0d02251def0797@mail.gmail.com> Date: Mon, 12 Oct 2009 10:55:01 +0100 Message-ID: <00a501ca4b22$10b8d3c0$0200a8c0@jimdesk> MIME-Version: 1.0 X-Mailer: Microsoft Office Outlook 11 In-Reply-To: <1f0624b90910120239u3b2c82fexa0d02251def0797@mail.gmail.com> X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3350 Thread-Index: AcpLICCDVgPRZTfhS1qDL0iVeLzQGwAAbkzQ X-Cloudmark-Analysis: v=1.0 c=1 a=F3M5lZpKAAAA:8 a=MDZQaXdsAAAA:8 a=8Y1m4M3-RBLym7rykPgA:9 a=1-X9qAPvNgfj_Br6dtUA:7 a=dsjt3-GD89k6BWM3gS64r_-eAnMA:4 a=wk6s2zzMB60A:10 a=nhn505YfawQA:10 a=iUAs5oRTDnlB1btG:21 a=gm4BlJVTHjTqH5AI:21 a=SSmOFEACAAAA:8 a=BOq39XVRuBaU6QGNQGkA:9 a=ZyexgofFS-j-5J9CrNMA:7 a=MNedoYyGxRet6i8X4U151VKSMzEA:4 X-Spam-Score: 0.3 (/) X-Spam-Report: autolearn=disabled,HTML_FONT_BIG=0.256,HTML_MESSAGE=0.001 Subject: RE: LF: RE: 503.6kHz Test Content-Type: multipart/alternative; boundary="----=_NextPart_000_00A6_01CA4B2A.727D3BC0" 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-IP: 193.82.116.20 ------=_NextPart_000_00A6_01CA4B2A.727D3BC0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit We do appreciate Dr. Moritz! I'd refer to him as an "elmer" but I suspect I am somewhat older than him. He got me from -20dB up to about 0dB With best regards Jim _____ From: owner-rsgb_lf_group@blacksheep.org [mailto:owner-rsgb_lf_group@blacksheep.org] On Behalf Of Gary - G4WGT Sent: 12 October 2009 10:39 To: rsgb_lf_group@blacksheep.org Subject: Re: LF: RE: 503.6kHz Test Hi Jim, LF, Thank you for the plot & your observations. I have downloaded the plot to study later. I had not realised until after the PA FET failure on Saturday night that the LPF toroids were very hot & need to be upgraded if I am going to run that level of power again (5 watts ERP about 4 Amps antenna current). I must also check the matching transformer toroids at the base of the antenna if that is getting hot also, I may look into the alternative matching (tapped coil) which you provided documentation & a spreadsheet for a while ago. Keep up the good work, I am sure that we all appreciate your input, time & efforts devoted to the hobby. Cheers, Gary - G4WGT. 2009/10/11 James Moritz Dear Gary, LF Group, This is what the signal looks like for about 11/2 hours up to 2200utc. The red signal is G4WGT, the yellow one is G4JNT's WSPR beacon. The blue line is the noise level scaled to about 300Hz bandwidth, to give an idea of the audible strength as a CW signal. The plot settings are not ideal to show variations in signal level - there are actually short periods where the signal fades to inaudibility that don't show up here, but it gives a reasonable idea. G4WGT I think must be mainly sky wave here so presumably the fading is due to different sky-wave paths. G4JNT is a very stable ground wave signal here during the day, so I imagine the fading here is due to the combination of ground wave and sky wave. Cheers, Jim Moritz 73 de M0BMU ------=_NextPart_000_00A6_01CA4B2A.727D3BC0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

We do appreciat= e Dr. Moritz!  I’d refer to him as an “elmer” but I suspect I am somewhat old= er than him.   He got me from -20dB up to about 0dB

 

With best regar= ds

 

 

Jim=

 

 

From: owner-rsgb_lf_group@blac= ksheep.org [mailto:owner-= rsgb_lf_group@blacksheep.org] On Behalf Of Gary - G4WGT
Sent: 12 October 2009= 10:39
To: rsgb_lf_group@blacksheep.org
Subject: Re: LF: RE: 50= 3.6kHz Test

 

Hi Jim, LF,

 

Thank you for the plot & your observation= s. I have downloaded the plot to study later.

 

I had not realised until after the PA FET fai= lure on Saturday night that the LPF toroids were very hot & need to be upgraded if I am= going to run that level of power again (5 watts ERP about 4 Amps antenna curren= t). I must also check the matching transformer toroids at the base of the an= tenna if that is getting hot also, I may look into the alternative matching (ta= pped coil) which you provided documentation & a spreadsheet for a while= ago.

 

Keep up the good work, I am sure that we all= appreciate your input, time & efforts devoted to the hobby.

 

Cheers,

 

Gary - G4WGT.

 

 

 

 

2009/10/11 James Moritz <james.moritz@btopenworld.com>

Dear Gary, LF Group,

This is what the signal looks like for about 11/2 hours up to 2200utc.= The red signal is G4WGT, the yellow one is G4JNT's WSPR beacon. The blue line= is the noise level scaled to about 300Hz bandwidth, to give an idea of the au= dible strength as a CW signal. The plot settings are not ideal to show varia= tions in signal level - there are actually short periods where the signal fades= to inaudibility that don't show up here, but it gives a reasonable idea.<= br>
G4WGT I think must be mainly sky wave here so presumably the fading is= due to  different sky-wave paths.  G4JNT is a very stable ground wa= ve signal here during the day, so I imagine the fading here is due to the combin= ation of ground wave and sky wave.



Cheers, Jim Moritz
73 de M0BMU

 

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