Return-Path: Received: from mtain-dc03.r1000.mx.aol.com (mtain-dc03.r1000.mx.aol.com [172.29.64.131]) by air-dc10.mail.aol.com (v129.4) with ESMTP id MAILINDC101-86064d77bada15e; Wed, 09 Mar 2011 12:37:30 -0500 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-dc03.r1000.mx.aol.com (Internet Inbound) with ESMTP id C8D4C380000F1; Wed, 9 Mar 2011 12:37:28 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1PxNJK-0001Bq-Qd for rs_out_1@blacksheep.org; Wed, 09 Mar 2011 17:36:34 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1PxNJK-0001Bh-1N for rsgb_lf_group@blacksheep.org; Wed, 09 Mar 2011 17:36:34 +0000 Received: from nm12-vm0.bullet.mail.ird.yahoo.com ([77.238.189.196]) by relay1.thorcom.net with smtp (Exim 4.63) (envelope-from ) id 1PxNJI-0006fA-7D for rsgb_lf_group@blacksheep.org; Wed, 09 Mar 2011 17:36:34 +0000 Received: from [77.238.189.51] by nm12.bullet.mail.ird.yahoo.com with NNFMP; 09 Mar 2011 17:36:26 -0000 Received: from [212.82.108.119] by tm4.bullet.mail.ird.yahoo.com with NNFMP; 09 Mar 2011 17:36:26 -0000 Received: from [127.0.0.1] by omp1028.mail.ird.yahoo.com with NNFMP; 09 Mar 2011 17:36:26 -0000 X-Yahoo-Newman-Id: 302754.42143.bm@omp1028.mail.ird.yahoo.com Received: (qmail 41921 invoked from network); 9 Mar 2011 17:36:26 -0000 DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=s1024; d=btinternet.com; h=DKIM-Signature:Received:X-Yahoo-SMTP:X-YMail-OSG:X-Yahoo-Newman-Property:Message-ID:From:To:References:In-Reply-To:Subject:Date:MIME-Version:Content-Type:X-Priority:X-MSMail-Priority:X-Mailer:X-MimeOLE; b=uQnw0APYOiWfLqo+MN1jpRmDyjNns18iXJoUx03/4tVM5EcpwyQghy3GlQhVoPitVYIoHrwEeLMlZqJpAhgagDl5DLqk1kpRiDchpq8JO5PoMqesTINccIEBhW5gj944Nepsgl5S3dN+MQ1dUC97OQl6s5OVvYxxjX9FsamefAg= ; DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=btinternet.com; s=s1024; t=1299692185; bh=6fK3wB8fTqJz4HTM5gkTYp0BmosIQQNyROKlW8CZnaI=; h=Received:X-Yahoo-SMTP:X-YMail-OSG:X-Yahoo-Newman-Property:Message-ID:From:To:References:In-Reply-To:Subject:Date:MIME-Version:Content-Type:X-Priority:X-MSMail-Priority:X-Mailer:X-MimeOLE; b=HalVUsbHruDk3qh4AM4W8JDDU8c1nhIKHN25VRSByFcThOe23frR97l6L6D8PHztxyzgRPTKGkW84KBo5JM101Jj+EKKQDTzQoOKbINWO//GdPRygWxgqoIf8C5QwKhCwxt4J/dL8Nw5MYooYkflfzIZK/avV+WfTu8+FSs7EQs= Received: from DennisPC (dennis.easterling@86.137.115.48 with login) by smtp824.mail.ird.yahoo.com with SMTP; 09 Mar 2011 09:36:25 -0800 PST X-Yahoo-SMTP: TSPLEfqswBCkXAu6R8U.gZB4K6usTmjOLOcEEoLxraDeRaJTpd5b1BNNnSoo X-YMail-OSG: zRCJV0IVM1kzkTlYRlvKH4hRQ2nwrO.F5PG5weSR35BTUKQ s2O9zGhXNYynZfNGQVofyQArfqeTV62ELIMTiUT_e_cujP2sUi0fQ1AJPqFt ipZEWA4lu6ruavfASXBeUSMzAyo4_zzyk_Eyf3KsZm8JXyG83CFkU.XOlack VJGV0ebBfsI9HmNq95RMbYxGg7_mYbAI1F4hNawd70SLgietRspzCL2UIUyt 41Mq3jWAJWDHWLTBSulIObXwzvoQNYs7_9SVrRR6klpDj6y1D2bxtuumcy6m s8a8wHkSvM7TvFp8QmrgkOzl1 X-Yahoo-Newman-Property: ymail-3 Message-ID: <80DEB562A3704793AA44779D78CB33F9@DennisPC> From: "DENNIS EASTERLING" To: References: <03700D87899646CC9B048258707B6D6F@lindavideo> <1929DFB074C3443A9FFCCF282CE8C8BD@DennisPC> <63D9FC139F624A5AAED55E0DD0F86CC9@lindavideo> In-Reply-To: <63D9FC139F624A5AAED55E0DD0F86CC9@lindavideo> Date: Wed, 9 Mar 2011 17:36:22 -0000 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Windows Mail 6.0.6002.18197 X-MimeOLE: Produced By Microsoft MimeOLE V6.0.6002.18263 DomainKey-Status: good (testing) X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,HTML_MESSAGE=0.001,UNPARSEABLE_RELAY=0.001 Subject: LF: Re: Re: Re: Alpha Stations Content-Type: multipart/alternative; boundary="----=_NextPart_000_0049_01CBDE80.8203D320" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.9 required=5.0 tests=HTML_30_40,HTML_MESSAGE, MISSING_OUTLOOK_NAME 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-m025.1 ; domain : btinternet.com DKIM : fail x-aol-sid: 3039ac1d40834d77bad855de X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none ------=_NextPart_000_0049_01CBDE80.8203D320 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hi Ken The alpha peak in the screen shot is fairly typical but they vary acco= rding to propagation by about +/-50%. The stations are easily identi= ified by the alternating pulses, as I guess they are really a navigati= on chain. I also get a permanent signal about 9.9kHz but don't know= its origin. The miniwhip feeds a Lowe HF-225 receiver, and if I tune to BBC R4 on= 198kHz, the S meter reads S9+50db, it is probabl;y more but held at= that point by the RX agc. My location is similar to yours, as I hav= e a block of flats nearby, and we are on low lying ground. The photo= shows the miniwhip without the extension on the antenna, which is now= fitted for VLF and is of similar length to yours. You will notice= that the miniwhip is supported by a collection of poles, the two high= est being wooden broomsticks, keeping metalwork well clear, otherwise= too much noise is picked up. The main TX aerial wire slopes down aw= ay from the miniwhip with a metre or so of lanyard tied to the lowest= metal pole (about 8ft from the ground. Overall, the miniwhip is abou= t 20ft high. I think that your chokes should be ok.=20 =20 I hope this information is useful, 73 Dennis M0JXM ----- Original Message -----=20 From: Ken=20 To: rsgb_lf_group@blacksheep.org=20 Sent: Tuesday, March 08, 2011 7:32 PM Subject: LF: Re: Re: Alpha Stations Hi Dennis. Thanks for the reply, the small peak at about 12.6 on your screen sh= ot is that typial?. I was not sure what I should be looking for on Win= rad, or even if Stefan's preamp was working when I saw a similar peak= at 9.941, 13.30 UTC. The preamp was at about 3m high, I have modified= the circuit for power feeding, by winding a 130mH choke on a FT50-77= ferrite, this has been holding up the project as I made four of them,= two for the PA0RDT miniwhip which is next. The preamp is at the end= of the garden about 2m from the 8m main 2inch aly mast, unfortunately= the new 6th Form college is 60m from the mast.How would you suggest= I evaluate the preamp performance, I tried sliding a four turn by 60m= m loop over the 350mm whip and feeding it fron the station osc but tha= t did not seem to do anything. Your thoughts please. 73 Ken =20 M0KHW =20 ----- Original Message -----=20 From: DENNIS EASTERLING=20 To: rsgb_lf_group@blacksheep.org=20 Sent: Tuesday, March 08, 2011 5:41 PM Subject: LF: Re: Alpha Stations Hi Ken See attached Winlab screen shot of a group of alpha stations, show= n as little white dashes on the upper window. They start just below= 12 kHz. Spectrum lab shows more clearly where they are located, but= the real time shot on Winrad gives a better idea. I suffer from int= erference from the 25kv East Coast Main LIne railway just a 100 yards= or so from my aerial at Biggleswade. The antenna is a PA0RDT miniwh= ip, see also top right of the picture where it is mounted on a pole. 73 Dennis M0JXM ----- Original Message -----=20 From: Ken=20 To: rsgb_lf_group@blacksheep.org=20 Sent: Tuesday, March 08, 2011 2:09 PM Subject: LF: Alpha Stations Hello All. Were there any Alpha Stations transmitting on 9.941 at 13.30 UTC= ?, I was checking to see I my Stefan 2 - 24 kHz preamp was working usi= ng Winrad and saw a small peak 9.941 about 15dB above the noise, disco= nnected the amp and definately coming down the antenna. Not sure how= large a signals I should see from Stefan's pre amp when switched on= the noise level does not change any suggestions please. 73s Ken M0KHW IO91TV ------=_NextPart_000_0049_01CBDE80.8203D320 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Hi Ken
 
The alpha peak in the screen shot is&= nbsp;fairly=20 typical but they vary according to propagation by about +/-50%. &= nbsp; The=20 stations are easily identiified by the alternating pulses, as I guess= they are=20 really a navigation chain.   I also get a permanent signal= about=20 9.9kHz but don't know its origin.
 
The miniwhip feeds a Lowe HF-225 rece= iver, and if I=20 tune to BBC R4 on 198kHz, the S meter reads S9+50db, it is probabl;y= more but=20 held at that point by the RX agc.   My location is similar= to yours,=20 as I have a block of flats nearby, and we are on low lying ground.&nbs= p; =20 The photo shows the miniwhip without the extension on the antenna, whi= ch is now=20 fitted for VLF and is of similar length to yours.  = ; You will=20 notice that the miniwhip is supported by a collection of poles, the tw= o highest=20 being wooden broomsticks, keeping metalwork well clear, otherwise= too much=20 noise is picked up.   The main TX aerial wire slopes down aw= ay from=20 the miniwhip with a metre or so of lanyard tied to the lowest metal po= le (about=20 8ft from the ground.  Overall, the miniwhip is about 20ft=20 high.    I think that your chokes should=20 be ok. 
  
I hope this information is useful, 73= Dennis=20 M0JXM
----- Original Message -----
From:=20 Ken
Sent: Tuesday, March 08, 2011= 7:32=20 PM
Subject: LF: Re: Re: Alpha St= ations

Hi Dennis.
Thanks for the reply, the small pea= k at=20 about 12.6 on your screen shot is that typial?. I was not sure= what I=20 should be looking for on Winrad, or even if Stefan's preamp was=20 working when I saw a similar peak at 9.941, 13.30 UTC. The prea= mp was at=20 about 3m high, I have modified the circuit for power feeding, by win= ding a=20 130mH choke on a FT50-77 ferrite, this has been holding up the proje= ct as I=20 made four of them, two for the PA0RDT miniwhip which is next. The pr= eamp is at=20 the end of the garden about 2m from the 8m main 2inch aly mast, unfo= rtunately=20 the new 6th Form college is 60m from the mast.How would you sug= gest I=20 evaluate the preamp performance, I tried sliding a four turn by 60mm= loop over=20 the 350mm whip and feeding it fron the station osc but that did not= seem to do=20 anything. Your thoughts please.
 
73
 
Ken  
 
M0KHW   
----- Original Message -----
Sent: Tuesday, March 08, 20= 11 5:41=20 PM
Subject: LF: Re: Alpha Stat= ions

Hi Ken
 
See attached Winlab screen shot= of a group of=20 alpha stations, shown as little white dashes on the upper=20 window.   They start just below 12 kHz.  Spectrum= lab shows=20 more clearly where they are located, but the real time shot on&nbs= p;Winrad=20 gives a better idea.   I suffer from interference from= the 25kv=20 East Coast Main LIne railway just a 100 yards or so from my aerial= at=20 Biggleswade.   The antenna is a PA0RDT miniwhip, see als= o=20 top right of the picture where it is mounted on a=20 pole.
 
73 Dennis M0JXM
----- Original Message -----
From:=20 Ken
Sent: Tuesday, March 08,= 2011 2:09=20 PM
Subject: LF: Alpha Statio= ns

Hello All.
Were there any Alpha Stations= transmitting on=20 9.941 at 13.30 UTC?, I was checking to see I my Stefan 2 - 24 kH= z preamp=20 was working using Winrad and saw a small peak 9.941 about= 15dB above=20 the noise, disconnected the amp and definately coming down the= antenna.=20 Not sure how large a signals I should see from Stefan's pre amp= when=20 switched on the noise level does not change any suggestions=20 please.
 
73s Ken
M0KHW  =20 IO91TV
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