Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-de01.r1000.mx.aol.com (Internet Inbound) with ESMTP id 13FF538000083; Sat, 26 Nov 2011 11:18:32 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1RUKwf-0005B1-GD for rs_out_1@blacksheep.org; Sat, 26 Nov 2011 16:17:41 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1RUKwe-0005As-Sq for rsgb_lf_group@blacksheep.org; Sat, 26 Nov 2011 16:17:40 +0000 Received: from relay.uni-heidelberg.de ([129.206.100.212]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1RUKwd-0002hF-K9 for rsgb_lf_group@blacksheep.org; Sat, 26 Nov 2011 16:17:40 +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 pAQGHbZc003128 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Sat, 26 Nov 2011 17:17:37 +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 pAQGHb1n024776; Sat, 26 Nov 2011 17:17:37 +0100 Message-ID: <4ED110CB.1050408@iup.uni-heidelberg.de> Date: Sat, 26 Nov 2011 17:16:11 +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: <184BB3B594844BF693BC8F53E3BFC8D1@White> 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="------------050102060001060606070508" 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_20_30,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: 0:2:449495520:93952408 X-AOL-SCOLL-URL_COUNT: 0 x-aol-sid: 3039ac1d40c94ed111580a86 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none This is a multi-part message in MIME format. --------------050102060001060606070508 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 pAQGHbZc003128 Markus, VLF, Oh! Yes indeed. I can also see my signal on the "DFCW-600" window of=20 OK2BVG: http://www.ok2bvg.cz/vlfgrabber/ :-) Unfortunately the OE3GHB=20 grabber is down... Currently i am running 350W constant. I am limited to 830 mA and run=20 about 800 mA now. If i increase the power/voltage, then i can see up to=20 8 cm long sparks flashing over on the cola-cap ;-) So that is one of the=20 next tasks here, building a better cap. Also i lost one of the F3.15A fuses that protects a half of the H=20 bridge. Luckily the FETs were still working after replacing the fuse. I=20 highly expect the problem is a longer fiber optic cable that was in use=20 to that time, so that i can generate and apply the frequency coming from=20 the notebook in the shack, about 10m distant. The higher losses in the=20 longer optic cable deformed the pulses and so the 2/1 divider (CD4013)=20 got a bad signal and did some undefined things... I am now working for a better drive of the LED here (7667...) and then=20 switch to the PC again (currently using the DDS again since it has a 12V=20 output that can drive the LED very well. Here, no glitches occurr. Then=20 i will have something to eat and run the system for some hours i hope. I=20 will then announce the exact start and stop times so that Paul Nicholson=20 can try to integrate over the entire TX time... 73, Stefan/DK7FC Am 26.11.2011 16:33, schrieb Markus Vester: > 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 > > --------------050102060001060606070508 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 pAQGHbZc003128 Markus, VLF,

Oh! Yes indeed. I can also see my signal on the "DFCW-600" window of OK2BVG: http://www.ok2bvg.cz/vlfgrabber/ :-) Unfortunately the OE= 3GHB grabber is down...

Currently i am running 350W constant. I am limited to 830 mA and run about 800 mA now. If i increase the power/voltage, then i can see up to 8 cm long sparks flashing over on the cola-cap ;-) So that is one of the next tasks here, building a better cap.

Also i lost one of the F3.15A fuses that protects a half of the H bridge. Luckily the FETs were still working after replacing the fuse. I highly expect the problem is a longer fiber optic cable that was in use to that time, so that i can generate and apply the frequency coming from the notebook in the shack, about 10m distant. The higher losses in the longer optic cable deformed the pulses and so the 2/1 divider (CD4013) got a bad signal and did some undefined things...

I am now working for a better drive of the LED here (7667...) and then switch to the PC again (currently using the DDS again since it has a 12V output that can drive the LED very well. Here, no glitches occurr. Then i will have something to eat and run the system for some hours i hope. I will then announce the exact start and stop times so that Paul Nicholson can try to integrate over the entire TX time...

73, Stefan/DK7FC

Am 26.11.2011 16:33, schrieb Markus Vester:
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


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