Return-Path: Received: from mtain-de03.r1000.mx.aol.com (mtain-de03.r1000.mx.aol.com [172.29.64.203]) by air-de06.mail.aol.com (v129.4) with ESMTP id MAILINDE062-5eb74be9ab3f24f; Tue, 11 May 2010 15:08:47 -0400 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mtain-de03.r1000.mx.aol.com (Internet Inbound) with ESMTP id 9073638000098; Tue, 11 May 2010 15:08:45 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1OBunA-0004Ew-Ed for rs_out_1@blacksheep.org; Tue, 11 May 2010 20:06:56 +0100 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1OBun9-0004En-E3 for rsgb_lf_group@blacksheep.org; Tue, 11 May 2010 20:06:55 +0100 Received: from n15.bullet.mail.mud.yahoo.com ([68.142.206.42]) by relay1.thorcom.net with smtp (Exim 4.63) (envelope-from ) id 1OBun8-0003KE-TM for rsgb_lf_group@blacksheep.org; Tue, 11 May 2010 20:06:55 +0100 Received: from [68.142.200.225] by n15.bullet.mail.mud.yahoo.com with NNFMP; 11 May 2010 19:06:47 -0000 Received: from [68.142.201.254] by t6.bullet.mud.yahoo.com with NNFMP; 11 May 2010 19:06:47 -0000 Received: from [127.0.0.1] by omp415.mail.mud.yahoo.com with NNFMP; 11 May 2010 19:06:27 -0000 X-Yahoo-Newman-Id: 969454.45460.bm@omp415.mail.mud.yahoo.com Received: (qmail 57065 invoked from network); 11 May 2010 19:06:27 -0000 DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=s1024; d=btinternet.com; h=Received:X-Yahoo-SMTP:X-YMail-OSG:X-Yahoo-Newman-Property:Message-ID:From:To:References:Subject:Date:MIME-Version:Content-Type:X-Priority:X-MSMail-Priority:X-Mailer:X-MimeOLE; b=KlhMdI84X2wW4OCsk1TjbE9jGxnfTZhWJ8AyW91bhatOmGqQY3JnG7SgFtHOaA1iKcgN3Grq3q8MSL9o6gCrMbjUqz6keGWhfx09K/o+xTSUwLGneJYvsZ2WBQYjlekVtzJDCiGjucVG1N3Iyi2PcrIx4vggBQ7KlViA6tKBGRY= ; Received: from host86-168-86-229.range86-168.btcentralplus.com (ken.h.wright@86.168.86.229 with login) by smtp147.mail.mud.yahoo.com with SMTP; 11 May 2010 12:06:27 -0700 PDT X-Yahoo-SMTP: 9Y6mUHuswBAgnrOsukIiNdFDf95uy_Dz34nY1hlg2liKgYD952sjbg-- X-YMail-OSG: YpOPRaMVM1nB5cZbTiamMz9OJQdjiimENTd5Q60xkGzU7RNU7A5uGZIezHqJxDGHYuf3XZUYwXP3cgHaaIHGNcul7OdPbZoZ0XXZZbzbMZoiv6jDEtyUrO5CiLh2Ps5EDJ2KBkHcH5imyewRDlLajy7D6jvT6i.8QBDVSakwoYSuftate6.OUW1mUKLRNNiHMfSbg2CtyrE6Yjcy3r2wHZMASCa1DIdBWHFH9XKO7XD2xwlIhRjiiTzvBWkWkoMYoMK9oezURyn9f4o.kHOswYhPI.mwy_LrGQNewphmWJzBwfQTTOwWMfPfiG7NMn.tctIedQ_YcgNLmqhqRBN8Ynqa X-Yahoo-Newman-Property: ymail-3 Message-ID: <2C6FAF6C1F03453882AA1017ACD31954@lindavideo> From: "Ken" To: References: , <4BE855F1.9050909@iup.uni-heidelberg.de> <25942409.3791470.1273567519765.JavaMail.fmail@mwmweb079> Date: Tue, 11 May 2010 20:05:07 +0100 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.5843 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.5579 DomainKey-Status: good (testing) Subject: Re: LF: RE: 8,97 kHz active antenna circuit and pictures Content-Type: multipart/alternative; boundary="----=_NextPart_000_0030_01CAF145.40D7C380" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: *** X-Spam-Status: No, hits=3.2 required=5.0 tests=FORGED_MUA_OUTLOOK,HTML_40_50, HTML_MESSAGE,HTML_TAG_EXISTS_TBODY,MAILTO_TO_SPAM_ADDR 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: 3039ac1d40cb4be9ab3d75a1 X-AOL-IP: 193.82.116.20 ------=_NextPart_000_0030_01CAF145.40D7C380 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hello Horst. Just clicked to open your pictures, but no pictures appeared. 73 Ken M0KHW ----- Original Message -----=20 From: Horst St=C3=B6cker=20 To: rsgb_lf_group@blacksheep.org=20 Sent: Tuesday, May 11, 2010 9:45 AM Subject: Re: LF: RE: 8,97 kHz active antenna circuit and pictures Hello Stefan, TV Transformer, interesting. I think it should work well on lower di= stance. QRP on 9kHz, hi. I also had this idea after my first tests on= 9kHz. I wanted to test it but my few TV transformers are DST and I th= ink I will need a flyback. The flybacks are common in the first genera= tions of tv sets up to the seventies but hard to get nowadays. I am not sure if the hoizontal antenna is the best solution. As we= know in theory there are more ground losses. But if this will be of= any significant influence at this low frequencies? I am looking foward to your tests again. BTW I am waiting for more motivating weather conditions. I collected= a few hundred meters of isolated military wire. After confectioning= it I will have material for an earthbase of about 800 to 1000 m. This= will be tested as soon as possible. Horst ----------------------------------------------------------------------= ------ Von: "Stefan Sch=C3=A4fer" Gesendet: 10.05.2010 20:52:33 An: rsgb_lf_group@blacksheep.org Betreff: Re: LF: RE: 8,97 kHz active antenna circuit and pictures Hello Victor, LF, It took a little bit to reply to your answer. You have been absolu= tely right! DLF(153kHz) is here just some 10km away and the strong fre= nch LF broadcast station on 162kHz has caused the nonlinear working of= my first stage i assume. Yesterday i talked with Markus/DF6NM and he= gave me the very useful hint to add a C between drain and gnd of the= first stage (what forms a low pass with the drain R). Before some min= utes i added a 100nF capacitor, so the edge frequency should be about= 15kHz. Before that, i have looked on a second experimental active E= field antenna how it influences the gain on the dreamers band (almost= no difference). But see the S/N improvement NOW on my grabber (http:/= /www.iup.uni-heidelberg.de/schaefer_vlf/DK7FC_VLF_Grabber.html)! What= a big difference!!! :-))))) So happy about that! :-) Tnx to Markus and you, Victor! 73, Stefan/DK7FC PS: I have built a small TX antenna at my new home QTH in Heidelbe= rg. With a TV transformer and my 300W PA (running at 15W DC input) i= apply about 2kV rms on a 10m horizontal wire, about 3m above gnd. The= distance to the grabber here is 1,1km. Hopefully i can see something,= at least in DFCW-600... Am 28.04.2010 15:51, schrieb victor13@online.nl:=20 Hi Stefan, looks nice but I suspect you have some im problem in your first= stage because off the strong line at 9 KHz,Maby it's better to use a= filter at the input.... 73 Victor -----Oorspronkelijk bericht----- Van: Stefan Sch=C3=A4fer [mailto:owner-rsgb_lf_group@blackshee= p.org]Namens Stefan Sch=C3=A4fer Verzonden: woensdag 28 april 2010 12:50 Aan: rsgb_lf_group@blacksheep.org Onderwerp: VLF: 8,97 kHz active antenna circuit and pictures Dear LF,=20 Daniele and others asked for the circuit of my active E field= antenna that i am using for my grabber. Now i have created a pdf file= where you can find the circuit and a picture of the arrangement and= a spectrogram of the currently working circuit. http://www.iup.uni-heidelberg.de/schaefer_vlf/8,97kHz%20active= %20E%20field%20antenna%20by%20DK7FC.pdf So, if you are interested or want to get some ideas for your= own circuit, take a look on it. I hope the link works. So, best 73 and maybe cu this evening there, dreamers. Stefan/DK7FC =20 =20 NEU: WEB.DE DSL f=C3=BCr 19,99 EUR/mtl. und ohne Mindest-Laufz= eit! =20 http://produkte.web.de/go/02/=20 ------=_NextPart_000_0030_01CAF145.40D7C380 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hello Horst.
Just clicked to open your pictures,= but no pictures=20 appeared.
73
Ken
M0KHW
----- Original Message -----
Sent: Tuesday, May 11, 2010= 9:45 AM
Subject: Re: LF: RE: 8,97 kHz= active=20 antenna circuit and pictures

Hello Ste= fan,


TV Transf= ormer, interesting. I think it should work=20 well on lower distance. QRP on 9kHz, hi. I also had this idea after= my first=20 tests on 9kHz. I wanted to test it but my few TV transformers are DS= T and I=20 think I will need a flyback. The flybacks are common in the first ge= nerations=20 of tv sets up to the seventies but hard to get=20 nowadays.

I am not= sure if the hoizontal antenna is the best=20 solution. As we know in theory there are more ground losses. But if= this will=20 be of any significant influence at this low=20 frequencies?

I am look= ing foward to your tests=20 again.

BTW I am= waiting for more motivating weather=20 conditions. I collected a few hundred meters of isolated military wi= re. After=20 confectioning it I will have material for an earthbase of about 800= to 1000 m.=20 This will be tested as soon as=20 possible.

Horst
=



<= SPAN style=3D"FONT-FAMILY: verdana,geneva">
Von: "Stefan Sch=C3=A4fer"=20 <Stefan.Schaefer@iup.uni-heidelberg.de>
Gesendet:= 10.05.2010=20 20:52:33
An: rsgb_lf_group@blacksheep.org
Betreff:= Re:=20 LF: RE: 8,97 kHz active antenna circuit and pictures

Hello Victor, LF,

It took a little bit to reply to you= r answer.=20 You have been absolutely right! DLF(153kHz) is here just some 10km= away and=20 the strong french LF broadcast station on 162kHz has caused the no= nlinear=20 working of my first stage i assume. Yesterday i talked with Markus= /DF6NM and=20 he gave me the very useful hint to add a C between drain and gnd= of the=20 first stage (what forms a low pass with the drain R). Before some= minutes i=20 added a 100nF capacitor, so the edge frequency should be about 15k= Hz. Before=20 that, i have looked on a second experimental active E field antenn= a how it=20 influences the gain on the dreamers band (almost no difference).= But see the=20 S/N improvement NOW on my grabber (http://www.iup.uni-heidelberg.de/schaefer_vlf/DK7FC_VL= F_Grabber.html)!=20 What a big difference!!! :-)))))
So happy about that! :-)
Tn= x to=20 Markus and you, Victor!

73, Stefan/DK7FC

PS: I have= built a=20 small TX antenna at my new home QTH in Heidelberg. With a TV trans= former and=20 my 300W PA (running at 15W DC input) i apply about 2kV rms on a 10= m=20 horizontal wire, about 3m above gnd. The distance to the grabber= here is=20 1,1km. Hopefully i can see something, at least in=20 DFCW-600...




Am 28.04.2010 15:51, schrieb victor13@online.nl:=20
Hi=20 Stefan,
 
looks nice=20 but I suspect you  have some im problem in your first stage= because=20 off the strong line at 9 KHz,Maby it's better to use a filter at= the=20 input....
 
73<= /DIV>
 
Victor
-----Oorspronkeli= jk=20 bericht-----
Van: Stefan Sch=C3=A4fer [mailto:owner-rsgb_lf_group@blacksheep.org]<= B>Namens=20 Stefan Sch=C3=A4fer
Verzonden: woensdag 28 april= 2010=20 12:50
Aan: rsgb_lf_group@blac= ksheep.org
Onderwerp:=20 VLF: 8,97 kHz active antenna circuit and pictures

Dear LF,

Daniele and others asked for the circuit= of my=20 active E field antenna that i am using for my grabber. Now i= have=20 created a pdf file where you can find the circuit and a pictur= e of the=20 arrangement and a spectrogram of the currently working=20 circuit.

http://www.iup.uni-heidelberg.de= /schaefer_vlf/8,97kHz%20active%20E%20field%20antenna%20by%20DK7FC.pdf<= /A>

So,=20 if you are interested or want to get some ideas for your own= circuit,=20 take a look on it. I hope the link works.

So, best 73= and maybe=20 cu this evening there,=20 dreamers.

Stefan/DK7FC

<= /BLOCKQUOTE>  

3D""
NEU:=20 WEB.DE DSL f=C3=BCr 19,99 EUR/mtl. und ohne=20 Mindest-Laufzeit!   
http://produkte.web.de/= go/02/
------=_NextPart_000_0030_01CAF145.40D7C380--