Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-dd06.r1000.mx.aol.com (Internet Inbound) with ESMTP id 7621F3800009F; Sat, 26 Nov 2011 12:18:53 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1RULtG-0006Hn-Ep for rs_out_1@blacksheep.org; Sat, 26 Nov 2011 17:18:14 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1RULtF-0006He-TX for rsgb_lf_group@blacksheep.org; Sat, 26 Nov 2011 17:18:13 +0000 Received: from relay.uni-heidelberg.de ([129.206.100.212]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1RULtD-0003Qs-Ne for rsgb_lf_group@blacksheep.org; Sat, 26 Nov 2011 17:18:13 +0000 Received: from freitag.iup.uni-heidelberg.de (freitag.iup.uni-heidelberg.de [129.206.29.204]) by relay.uni-heidelberg.de (8.14.1/8.14.1) with ESMTP id pAQHIA3c011487 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Sat, 26 Nov 2011 18:18:10 +0100 Received: from [129.206.22.206] (pc206.iup.uni-heidelberg.de [129.206.22.206]) by freitag.iup.uni-heidelberg.de (8.12.11.20060308/8.11.2) with ESMTP id pAQHIAId026722; Sat, 26 Nov 2011 18:18:10 +0100 Message-ID: <4ED11EFC.1030002@iup.uni-heidelberg.de> Date: Sat, 26 Nov 2011 18:16:44 +0100 From: =?ISO-8859-2?Q?Stefan_Sch=E4fer?= User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; de; rv:1.9.1.8) Gecko/20100227 Thunderbird/3.0.3 MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org CC: Paul References: ,<66E491BAB91C48AF81191F4022525A14@DennisPC> <6FE757960E6C447781689D4F19A315AE@DennisPC> <4EC2C6EB.2080201@iup.uni-heidelberg.de> <4EC2DB14.9000807@talktalk.net>,<4ECFD8B6.2050601@iup.uni-heidelberg.de> <4ED0E0EC.9020404@iup.uni-heidelberg.de> <4ED0FE66.2070706@iup.uni-heidelberg.de> <184BB3B594844BF693BC8F53E3BFC8D1@White> In-Reply-To: X-Spam-Score: 1.4 (+) X-Spam-Report: autolearn=disabled,HTML_MESSAGE=0.001,RATWARE_GECKO_BUILD=1.426 Subject: Re: VLF: 8970 Hz transmissions, soon again here Content-Type: multipart/alternative; boundary="------------030102030006080505090302" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.5 required=5.0 tests=HTML_40_50,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-SCOLL-SCORE: 0:2:469387744:93952408 X-AOL-SCOLL-URL_COUNT: 0 x-aol-sid: 3039ac1d40924ed11f7c67a6 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none This is a multi-part message in MIME format. --------------030102030006080505090302 Content-Type: text/plain; charset=ISO-8859-2; format=flowed Content-Transfer-Encoding: quoted-printable X-MIME-Autoconverted: from 8bit to quoted-printable by relay.uni-heidelberg.de id pAQHIA3c011487 VLF, Am 26.11.2011 17:55, schrieb Markus Vester: > Once more, Paul Nicholson is showing a good trace: > http://abelian.org/vlf/fbins.shtml#p=3D1322319600&b=3D120&s=3Dsp=20 > Wow, yes, very good! Well, the system runs on the GPS locked system now since 17:00 UTC and=20 i'm running 780 mA on 8970.00000 Hz. Will go for dinner now and leave=20 the system running some hours. The WX looks quite useful, no rain, poor=20 wind and no fog! Maybe i will even run it overnight until tomorrow,=20 transmitting a streight carrier at 350 W RF. Can't do more=20 unfortunately, due to the cola-cap ;-) Now as the signal is locked and non-drifting there may come up something=20 on the 6000-windows... Maybe Paul or others can do some calculations, estimating the ERP? I=20 think it should be in the range of 200 uW. Up to 6 dB can be added in=20 further tests, i hope. Markus, a S/N (better S and N ;-) ) plot on your side would be=20 interesting. My ERP should be constant now so we can observe the QSB,=20 caused by propagation... A photo of the todays arrangement:=20 http://dl.dropbox.com/u/19882028/VLF/DSC04268.JPG 73, GL, Stefan/DK7FC > ... well done! > Markus > *From:* Markus Vester > *Sent:* Saturday, November 26, 2011 4:33 PM > *To:* rsgb_lf_group@blacksheep.org > *Subject:* Re: VLF: 8970 Hz transmissions, soon again here > > Stefan, > around 15:00, your sig on 8970.008 was visible in Nuernberg, peaking ~=20 > 20 dB SNR in 0.48 mHz. > Viel Gl=FCck, > Markus (DF6NM) > > *From:* Stefan Sch=E4fer > *Sent:* Saturday, November 26, 2011 3:57 PM > *To:* rsgb_lf_group@blacksheep.org > *Cc:* Paul > *Subject:* Re: VLF: 8970 Hz transmissions, soon again here > > VLF, > > I'm now running 350W into the system and get about 0.8 A antenna > current. Strong audible partial discharges occurr on a parallel fixed > plate capacitor, spaced by 3 cola bottles (0.33l ;-) ). At 550 mH i hav= e > 25 kV rms on the antenna and coil which seems to be no problem at all. > > The frequency is still a bit unstable since i took the DDS VFO which is > more comfortable to find the resonance. I will now try to slightly QRO > and then apply a fiber optic cable carrying the GPS locked frequency > coming from the PC/SpecLab, hopefully without to many phase glitches. > Currently i may have an offset of some 20...30 mHz and a slight drift > but it is a first successfully test :-) > > 73, Stefan/DK7FC > > --------------030102030006080505090302 Content-Type: text/html; charset=ISO-8859-2 Content-Transfer-Encoding: quoted-printable X-MIME-Autoconverted: from 8bit to quoted-printable by relay.uni-heidelberg.de id pAQHIA3c011487 VLF,


Am 26.11.2011 17:55, schrieb Markus Vester:
Once more, Paul Nicholson is showi= ng a good trace:
=A0

Wow, yes, very good!

Well, the system runs on the GPS locked system now since 17:00 UTC and i'm running 780 mA on 8970.00000 Hz. Will go for dinner now and leave the system running some hours. The WX looks quite useful, no rain, poor wind and no fog! Maybe i will even run it overnight until tomorrow, transmitting a streight carrier at 350 W RF. Can't do more unfortunately, due to the cola-cap ;-)

Now as the signal is locked and non-drifting there may come up something on the 6000-windows...

Maybe Paul or others can do some calculations, estimating the ERP? I think it should be in the range of 200 uW. Up to 6 dB can be added in further tests, i hope.
Markus, a S/N (better S and N ;-) ) plot on your side would be interesting. My ERP should be constant now so we can observe the QSB, caused by propagation...

A photo of the todays arrangement: http://dl.dropbox.com/u/19882028/VLF/DSC04268.JPG

73, GL, Stefan/DK7FC






=A0
... well done!
=A0
Markus
=A0
Sent: Saturday, November 26, 2011 4:33 PM
Subject: Re: VLF: 8970 Hz transmissions, soon again here

Stefan,
=A0
around=A015:00, your sig on 8970.0= 08 was visible in Nuernberg,=A0peaking ~ 20 dB SNR in 0.48 mHz.
=A0
Viel Gl=FCck,
Markus (DF6NM)

Sent: Saturday, November 26, 2011 3:57 PM
Cc: Paul
Subject: Re: VLF: 8970 Hz transmissions, soon again here

VLF,

I'm now running 350W into the system and get about 0.8 A antenna
current. Strong audible partial discharges occurr on a parallel fixed plate capacitor, spaced by 3 cola bottles (0.33l ;-) ). At 550 mH i have
25 kV rms on the antenna and coil which seems to be no problem at all.
The frequency is still a bit unstable since i took the DDS VFO which is
more comfortable to find the resonance. I will now try to slightly QRO and then apply a fiber optic cable carrying the GPS locked frequency
coming from the PC/SpecLab, hopefully without to many phase glitches. Currently i may have an offset of some 20...30 mHz and a slight drift but it is a first successfully test :-)

73, Stefan/DK7FC


--------------030102030006080505090302--