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[195.171.43.25]) by mx.google.com with ESMTP id v4si3145402wjq.174.2014.02.07.15.37.49 for ; Fri, 07 Feb 2014 15:37:50 -0800 (PST) Received-SPF: neutral (google.com: 195.171.43.25 is neither permitted nor denied by best guess record for domain of owner-rsgb_lf_group@blacksheep.org) client-ip=195.171.43.25; Authentication-Results: mx.google.com; spf=neutral (google.com: 195.171.43.25 is neither permitted nor denied by best guess record for domain of owner-rsgb_lf_group@blacksheep.org) smtp.mail=owner-rsgb_lf_group@blacksheep.org; dkim=pass header.i=@mx.aol.com Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1WBuXW-0002hx-Ex for rs_out_1@blacksheep.org; Fri, 07 Feb 2014 23:08:54 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1WBuXV-0002ho-GQ for rsgb_lf_group@blacksheep.org; Fri, 07 Feb 2014 23:08:53 +0000 Received: from omr-m04.mx.aol.com ([64.12.143.78]) by relay1.thorcom.net with esmtps (TLSv1:AES256-SHA:256) (Exim 4.77) (envelope-from ) id 1WBuXS-0005Bz-8N for rsgb_lf_group@blacksheep.org; Fri, 07 Feb 2014 23:08:52 +0000 Received: from mtaout-mba01.mx.aol.com (mtaout-mba01.mx.aol.com [172.26.133.109]) by omr-m04.mx.aol.com (Outbound Mail Relay) with ESMTP id 0257C7000008A for ; Fri, 7 Feb 2014 18:08:46 -0500 (EST) Received: from White (95-91-237-152-dynip.superkabel.de [95.91.237.152]) by mtaout-mba01.mx.aol.com (MUA/Third Party Client Interface) with ESMTPA id A7FEB3800009E for ; Fri, 7 Feb 2014 18:08:42 -0500 (EST) Message-ID: <118B1007AD7740E29CD36A6EF821A2B6@White> From: "Markus Vester" To: References: <4D01645C0D6D4D8FAAE5EF4440494BD6@White> <102e01cf2451$21174dc0$6345e940$@comcast.net> Date: Sat, 8 Feb 2014 00:08:40 +0100 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal Importance: Normal X-Mailer: Microsoft Windows Live Mail 12.0.1606 X-MimeOLE: Produced By Microsoft MimeOLE V12.0.1606 x-aol-global-disposition: G DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=mx.aol.com; s=20121107; t=1391814525; bh=aARDkU0Vx0wjumaNMuF4xB4BUMIWgHrTKOEKA+W+8NE=; h=From:To:Subject:Message-ID:Date:MIME-Version:Content-Type; b=JnYt6M51ZBLmF5tB+lvrFYEbckr8Y0obzP/MoqlExbdVnMT0EdHIVmfJhINL/CYQb pZlAYqjow2909rMRXRh+Bn7upjrqIzkLFyeGMb3Snk563kWOkgsdw3j1eIpZIPJ2tb 383cv/rzhRon48k3UchNRuEo7JdwnYho3ZazIEWM= x-aol-sid: 3039ac1a856d52f5677a6adc X-AOL-IP: 95.91.237.152 X-Spam-Score: -0.5 (/) X-Spam-Report: Spam detection software, running on the system "relay1.thorcom.net", has identified this incoming email as possible spam. The original message has been attached to this so you can view it (if it isn't spam) or label similar future email. If you have any questions, see the administrator of that system for details. Content preview: Thanks Jim! My antenna's effective height measured at LF is about 9 m. It will be slightly less at VLF due to increased shielding by trees, my guess is ~ 8 m, giving 77 microohms radiation resistance. Thus 0.3 amps would radiate 7 µW (EMRP) or 13 µW ERP. [...] Content analysis details: (-0.5 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at http://www.dnswl.org/, no trust [64.12.143.78 listed in list.dnswl.org] 0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider (markusvester[at]aol.com) -0.0 SPF_PASS SPF: sender matches SPF record -0.6 RP_MATCHES_RCVD Envelope sender domain matches handover relay domain 0.0 HTML_MESSAGE BODY: HTML included in message 0.0 T_DKIM_INVALID DKIM-Signature header exists but is not valid X-Scan-Signature: 0b503eb45ffb894d1a22386be380366d Subject: Re: Re: VLF: 8270.002 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0010_01CF2461.EBE1DFB0" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.2 required=5.0 tests=HTML_60_70,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 Dies ist eine mehrteilige Nachricht im MIME-Format. ------=_NextPart_000_0010_01CF2461.EBE1DFB0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Thanks Jim! My antenna's effective height measured at LF is about 9 m. It will be = slightly less at VLF due to increased shielding by trees, my guess is ~ = 8 m, giving 77 microohms radiation resistance. Thus 0.3 amps would = radiate 7 =B5W (EMRP) or 13 =B5W ERP. Operating hours are a bit limited by politeness to the neighbours who = have to bear the acoustical emission from the loading coil. The 8.3 kHz = tone is not really loud but quite penetrant. Here are a couple of pics = of the present setup, with the coil enclosed by two rubber bins and = placed outside the window: http://dl.dropboxusercontent.com/u/26404526/vlf_coil_at_window.jpg http://dl.dropboxusercontent.com/u/26404526/vlf_coil_and_antenna.jpg Good luck with your forthcoming experiments! Best 73, Markus (DF6NM) From: hvanesce=20 Sent: Friday, February 07, 2014 11:08 PM To: rsgb_lf_group@blacksheep.org=20 Subject: RE: Re: VLF: 8270.002 Markus, =20 Great signal, congratulations.=20 =20 Was your ERP ~ 5uW? =20 I had hoped to be operational (RX and TX) with the new stable oscillator = last weekend but work and other nuisances interfered. I hope to complete = that work this weekend, and try your TX stabilization technique next = week; all of your work in this area much appreciated. =20 73, Jim AA5BW =20 From: owner-rsgb_lf_group@blacksheep.org = [mailto:owner-rsgb_lf_group@blacksheep.org] On Behalf Of Markus Vester Sent: Friday, February 7, 2014 12:33 PM To: rsgb_lf_group@blacksheep.org Subject: Re: Re: VLF: 8270.002 =20 Uwe, yes - the left channel picks up the electric field near the = antenna, using a 20 cm piece of open wire (level about - 30dB at L1). = Both generators are active: the test signal generator feeds the phase = reference to R5, and the digimode terminal delivers the output to the PA = through L5. =20 Lubos, I was positively surprised to see about 20 dB SNR on your = excellent Apollon temple receiver. =20 Peter, I think the signal did leave a 10 dB dash in your 238 =B5Hz = window. Not sure about that 47 uHz pixel, but the two-hour transmission = would really be too short for that bandwidth. =20 No trace yet on Stefan's new window, but this may well be due to the = midday propagation minimum which we have often experienced on 8970 = before. =20 =20 Thank you all for the grabbers and comments! =20 Best 73, Markus (DF6NM) =20 From: uwe-jannsen@kabelmail.de=20 Sent: Friday, February 07, 2014 2:06 PM To: rsgb_lf_group@blacksheep.org=20 Subject: Re: Re: VLF: 8270.002 =20 Hi Markus, so you feed the left channel with your eradiated signs via a piece of = wire ? what abt the signal generator and the digimode modulator, is one of them = switched off? ga=20 Uwe =20 -------------------------------------------------------------------------= ------- Von: rsgb_lf_group@blacksheep.org Gesendet: 07.02.2014 12:37 An: rsgb_lf_group@blacksheep.org Kopie: paul@abelian.netcom.co.uk Betreff: Re: VLF: 8270.002 -------------------------------------------------------------------------= ------- =20 oops - that should be 8270.002! Old habits persist ;-) 73, Markus =20 From: Markus Vester=20 Sent: Friday, February 07, 2014 12:30 PM To: rsgb_lf_group@blacksheep.org=20 Cc: Paul=20 Subject: VLF: 8970.002 =20 I'm currently running a short test on 8970.002 Hz from 10 to 12 UT, = using SpecLab phase-locked to 1-pps. The antenna is swinging in the wind = so the current is a bit variable (0.25 to 0.3 A), but the feedback = scheme should keep the radiated phase steady. So far a good peak has = become visible at OK2BVG. =20 Best 73, Markus =20 =20 ------=_NextPart_000_0010_01CF2461.EBE1DFB0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Thanks Jim!
 
My antenna's effective = height measured at LF=20 is about 9 m. It will be slightly less at VLF due to increased = shielding by trees, my guess is ~ 8 m, giving 77 microohms = radiation=20 resistance. Thus 0.3 amps would radiate 7 =B5W (EMRP) or = 13=20 =B5W ERP.
 
Operating hours are a = bit limited by=20 politeness to the neighbours who have to bear the acoustical=20 emission from the loading coil. The 8.3 kHz tone is not really = loud=20 but quite penetrant. Here are a couple of pics of the present setup, = with the=20 coil enclosed by two rubber bins and placed outside the=20 window:
http://dl.dropboxusercontent.com/u/26404526/vlf_coil_at_window.jpg=
http://dl.dropboxusercontent.com/u/26404526/vlf_coil_and_antenna.jpg=
 
Good luck with your forthcoming=20 experiments!
 
Best 73,
Markus (DF6NM)
 

From: hvanesce
Sent: Friday, February 07, 2014 11:08 PM
To: rsgb_lf_group@blacksheep.org= =20
Subject: RE: Re: VLF: 8270.002

Markus,

 

Great=20 signal, congratulations.

 

Was=20 your ERP ~ 5uW?

 

I=20 had hoped to be operational (RX and TX) with the new stable oscillator = last=20 weekend but work and other nuisances interfered. I hope to complete that = work=20 this weekend, and try your TX stabilization technique next week; all of = your=20 work in this area much appreciated.

 

73,=20 Jim AA5BW

 

From: owner-rsgb_lf_group@bl= acksheep.org=20 [mailto:owner-rsgb_lf_group@blacksheep.org] On Behalf Of Markus=20 Vester
Sent: Friday, February 7, 2014 12:33 PM
To:=20 rsgb_lf_group@blacksheep.org
Subject: Re: Re: VLF:=20 8270.002

 

Uwe, yes - = the left=20 channel picks up the electric field near the antenna, using a 20 cm = piece of=20 open wire (level about - 30dB at L1). Both generators are active: = the test=20 signal generator feeds the phase reference to R5, and the digimode = terminal=20 delivers the output to the PA through L5.

 

Lubos, I = was=20 positively surprised to see about 20 dB SNR on your excellent = Apollon=20 temple receiver.

 

Peter, I = think the=20 signal did leave a 10 dB dash in your 238 =B5Hz window. Not sure = about that=20 47 uHz pixel, but the two-hour transmission would really=20 be  too short for that bandwidth.

 

No trace yet on=20 Stefan's new window, but this may well be due to the midday=20 propagation minimum which we have often experienced on 8970=20 before.  

 

Thank you = all for the=20 grabbers and comments!

 

Best=20 73,

Markus=20 (DF6NM)

 

From: uwe-jannsen@kabelmail.de=20

Sent: Friday, = February=20 07, 2014 2:06 PM

To: rsgb_lf_group@blacksheep.org= =20

Subject: Re: Re: = VLF:=20 8270.002

 

Hi = Markus,

so = you feed=20 the left channel with your eradiated signs via a piece of wire=20 ?

what abt the=20 signal generator and the digimode modulator, is one of them switched=20 off?

ga=20

Uwe

 

Von: rsgb_lf_group@blacksheep.org=
Gesendet:=20 07.02.2014 12:37
An: rsgb_lf_group@blacksheep.org=
Kopie:=20 paul@abelian.netcom.co.ukBetreff:=20 Re: VLF: 8270.002

 

oops - that = should be=20 8270.002! Old habits persist ;-) 73,=20 Markus

 

From: Markus = Vester=20

Sent: Friday, = February=20 07, 2014 12:30 PM

To: rsgb_lf_group@blacksheep.org= =20

Cc: Paul=20

Subject: VLF:=20 8970.002

 

I'm = currently running=20 a short test on 8970.002 Hz from 10 to 12 UT, using SpecLab = phase-locked to=20 1-pps. The antenna is swinging in the wind so the current is a = bit=20 variable (0.25 to 0.3 A), but the feedback scheme should keep=20 the radiated phase steady. So far a good peak has become = visible at=20 OK2BVG.

 

Best=20 73,

Markus

 

 

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