Return-Path: Received: from mtain-da09.r1000.mx.aol.com (mtain-da09.r1000.mx.aol.com [172.29.64.81]) by air-da07.mail.aol.com (v129.4) with ESMTP id MAILINDA074-86674cc739912ea; Tue, 26 Oct 2010 16:26:57 -0400 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-da09.r1000.mx.aol.com (Internet Inbound) with ESMTP id 22F213800009E; Tue, 26 Oct 2010 16:26:56 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1PAq5U-0007RB-7g for rs_out_1@blacksheep.org; Tue, 26 Oct 2010 21:25:40 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1PAq5T-0007R2-NN for rsgb_lf_group@blacksheep.org; Tue, 26 Oct 2010 21:25:39 +0100 Received: from mta03.xtra.co.nz ([210.54.141.252]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1PAq5R-0006ei-0w for rsgb_lf_group@blacksheep.org; Tue, 26 Oct 2010 21:25:39 +0100 Received: from [192.168.0.101] (really [222.153.30.225]) by mta03.xtra.co.nz with ESMTP id <20101026202524.KIKO11283.mta03.xtra.co.nz@[192.168.0.101]> for ; Wed, 27 Oct 2010 09:25:24 +1300 Message-ID: <4CC738B9.3020309@xtra.co.nz> Date: Wed, 27 Oct 2010 09:23:21 +1300 From: ZL2AFP User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.2.8) Gecko/20100802 Thunderbird/3.1.2 MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org References: <4CC69F88.6040905@xtra.co.nz> <4CC6BE1D.4010503@iup.uni-heidelberg.de> <4CC70CBD.2040700@iup.uni-heidelberg.de> In-Reply-To: <4CC70CBD.2040700@iup.uni-heidelberg.de> X-Spam-Score: 1.4 (+) X-Spam-Report: autolearn=disabled,HTML_MESSAGE=0.001,RATWARE_GECKO_BUILD=1.426 Subject: Re: LF: Alpha stations Content-Type: multipart/alternative; boundary="------------070100060603060201070508" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.0 required=5.0 tests=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: G x-aol-sid: 3039ac1d40514cc7398f3b0d X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none X-Mailer: Unknown (No Version) --------------070100060603060201070508 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: quoted-printable This is most interesting. I wonder if they do this sort of thing=20 often, for maintenance perhaps. At 25dB down they are pretty much below=20 the noise floor here. I use a Wndel&Golterman SLM, modified to provide=20 audio output, to listen to the various stations, and a 96kHz USB=20 soundcard and Spectrum laboratory to see the spectrum from DC to 48kHz.=20 The Alpha stations normally are all well above the noise level day and=20 night. Also interesting to see that some of the stations I see over here are=20 visible on the other side of the world. Now if only I could also see the= =20 amateur stations....... 73 Con On 27/10/2010 6:15 a.m., Stefan Sch=E4fer wrote: > It seems the Alpha TX at 11904 Hz is/are not completely OFF but rather= =20 > about 25 dB weaker in the moment! I still receive a signal, 20 dB=20 > above noise in 176 =B5Hz here... > > 73, Stefan > > Am 26.10.2010 13:40, schrieb Stefan Sch=E4fer: >> Hello Con, >> >> Thank you! >> >> The Alphas are currently off. >> >> You can check it on my VLF grabber if you want, it is running 24/7:=20 >> http://www.iup.uni-heidelberg.de/schaefer_vlf/DK7FC_VLF_Grabber.html >> >> There is a grabber window (RSDN-20_F1) which shows the Alpha trace at= =20 >> 11904.7619 Hz. You can see it is OFF since 2 days. The lower window=20 >> (wideband) shows the VLF spectrum, as received here in Heidelberg.=20 >> There, you can see all 3 Alpha traces, if they are ON, at about 15 dB= =20 >> S/N, depending on daytime but always visible... >> >> Good luck in experimenting down there :-) >> >> 73, Stefan/DK7FC >> >> >> >> Am 26.10.2010 11:29, schrieb ZL2AFP: >>> Hello folks, >>> >>> I am new to the group and have been following with great interest=20 >>> the VLF experiments. Congratulations to Stefan on such great DX=20 >>> (1000+km). This is really good stuff. >>> >>> I have noticed in recent days that the Alpha stations at 11.9 and=20 >>> 14.8kHz seem to have stopped transmitting. I can normally hear seven= =20 >>> stations but they have all disappeared. So I am wondering if=20 >>> propagation has taken a dive, or perhaps the stations have gone QRT? >>> >>> Has anyone over there heard the Alpha stations recently? >>> >>> 73 >>> Con ZL2AFP > > > > No virus found in this incoming message. > Checked by AVG - www.avg.com > Version: 8.5.448 / Virus Database: 271.1.1/3220 - Release Date: 10/26/10= 06:34:00 > --------------070100060603060201070508 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit This is most interesting. I wonder if they do this sort of thing often, for maintenance perhaps. At 25dB down they are pretty much below the noise floor here. I use a Wndel&Golterman SLM, modified to provide audio output, to listen to the various stations, and a 96kHz USB soundcard and Spectrum laboratory to see the spectrum from DC to 48kHz. The Alpha stations normally are all well above the noise level day and night.

Also interesting to see that some of the stations I see over here are visible on the other side of the world. Now if only I could also see the amateur stations.......

73
Con

On 27/10/2010 6:15 a.m., Stefan Schäfer wrote:
It seems the Alpha TX at 11904 Hz is/are not completely OFF but rather about 25 dB weaker in the moment! I still receive a signal, 20 dB above noise in 176 µHz here...

73, Stefan

Am 26.10.2010 13:40, schrieb Stefan Schäfer:
Hello Con,

Thank you!

The Alphas are currently off.

You can check it on my VLF grabber if you want, it is running 24/7: http://www.iup.uni-heidelberg.de/schaefer_vlf/DK7FC_VLF_Grabber.html

There is a grabber window (RSDN-20_F1) which shows the Alpha trace at 11904.7619 Hz. You can see it is OFF since 2 days. The lower window (wideband) shows the VLF spectrum, as received here in Heidelberg. There, you can see all 3 Alpha traces, if they are ON, at about 15 dB S/N, depending on daytime but always visible...

Good luck in experimenting down there :-)

73, Stefan/DK7FC



Am 26.10.2010 11:29, schrieb ZL2AFP:
 Hello folks,

I am new to the group and have been following with great interest the VLF experiments. Congratulations to Stefan on such great DX (1000+km). This is really good stuff.

I have noticed in recent days that the Alpha stations at 11.9 and 14.8kHz seem to have stopped transmitting. I can normally hear seven stations but they have all disappeared. So I am wondering if propagation has taken a dive, or perhaps the stations have gone QRT?

Has anyone over there heard the Alpha stations recently?

73
Con ZL2AFP 


No virus found in this incoming message.
Checked by AVG - www.avg.com 
Version: 8.5.448 / Virus Database: 271.1.1/3220 - Release Date: 10/26/10 06:34:00

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