Return-Path: Received: from mtain-mb06.r1000.mx.aol.com (mtain-mb06.r1000.mx.aol.com [172.29.96.26]) by air-md02.mail.aol.com (v128.1) with ESMTP id MAILINMD022-8b794bb6335a7f; Fri, 02 Apr 2010 14:11:38 -0400 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mtain-mb06.r1000.mx.aol.com (Internet Inbound) with ESMTP id A2EB3380000C3; Fri, 2 Apr 2010 14:11:36 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1NxlKN-0003ei-36 for rs_out_1@blacksheep.org; Fri, 02 Apr 2010 19:10:43 +0100 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1NxlKM-0003eZ-Hi for rsgb_lf_group@blacksheep.org; Fri, 02 Apr 2010 19:10:42 +0100 Received: from smtp02.online.nl ([194.134.41.32]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1NxlKK-0006pm-84 for rsgb_lf_group@blacksheep.org; Fri, 02 Apr 2010 19:10:42 +0100 Received: from smtp02.online.nl (localhost [127.0.0.1]) by smtp02.online.nl (Postfix) with ESMTP id 4C71BA0F8 for ; Fri, 2 Apr 2010 20:10:36 +0200 (CEST) Received: from pa3fnytrqxpddu (s5593e077.adsl.wanadoo.nl [85.147.224.119]) by smtp02.online.nl (Postfix) with SMTP for ; Fri, 2 Apr 2010 20:10:36 +0200 (CEST) From: To: Date: Fri, 2 Apr 2010 20:10:36 +0200 Message-ID: MIME-Version: 1.0 X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook IMO, Build 9.0.2416 (9.0.2911.0) X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.5579 X-MS-TNEF-Correlator: In-Reply-To: <38A51B74B884D74083D7950AD0DD85E82A1BBF@File-Server-HST.hst.e-technik.tu-darmstadt.de> Importance: Normal X-Online-Scanned: by Cloudmark authority (on smtp02.online.nl) X-Spam-Score: 0.6 (/) X-Spam-Report: autolearn=disabled,HTML_MESSAGE=0.001,NO_REAL_NAME=0.55 Subject: LF: RE: 4th VLF experiment by DK7FC/p Content-Type: multipart/mixed; boundary="----=_NextPart_000_0010_01CAD2A0.8E901CD0" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: * X-Spam-Status: No, hits=1.3 required=5.0 tests=FROM_ENDS_IN_NUMS, HTML_FONTCOLOR_BLUE,HTML_MESSAGE,NO_REAL_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 x-aol-global-disposition: G X-AOL-VSS-INFO: 5400.1158/56983 X-AOL-VSS-CODE: clean x-aol-sid: 3039ac1d601a4bb6335873ae X-AOL-IP: 193.82.116.20 ------=_NextPart_000_0010_01CAD2A0.8E901CD0 Content-Type: multipart/alternative; boundary="----=_NextPart_001_0011_01CAD2A0.8E94D7C0" ------=_NextPart_001_0011_01CAD2A0.8E94D7C0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable HI Stefan,lf the computer is allready running, good luck Victor PA3FNY -----Oorspronkelijk bericht----- Van: Stefan Sch=E4fer [mailto:owner-rsgb_lf_group@blacksheep.org]Nam= ens Stefan Sch=E4fer Verzonden: vrijdag 2 april 2010 2:39 Aan: rsgb_lf_group@blacksheep.org Onderwerp: VLF: 4th VLF experiment by DK7FC/p Dear group,=20 After a break of one week i plan to transmit again on VLF / 8,97 kHz= . If the wind will be enough i will come up on saturday, 3. April, at arrou= nd 10 UTC. The DFCW-600 mode was a good choice in the last experiment, so i wil= l keep this mode.=20 If Markus/DF6NM has time to make QSP on the mobile phone to the refl= ector (Markus ?) we could arrange various tests. I will also call other loca= l stations for reception reports during the transmission. There will be some new components to test:=20 Today i started building up the 600W class D PA (at least 600W) that= is directly fed out of the 230V (rectified) of the generator. PTT and VFO= input is realised by fiber optic cables. The DC capacitor is 2000=B5F/350V= and can be put on voltage without a NTC or charging resistor due to the relati= vely high output impedance of the small generator (tested). This works very= fine now. Tomorrow i will apply the FETs and the big ferrite core and it's windings. Then i will do a test on a dummy load at home. If the signal= will be 3dB stronger, we could theoretically change to DFCW-300 compared to= the last experiment. But there are many OMs writing private mails to me an= d prepare to be QRV on this next test. Some of them are using E-Field an= tennas and/or are more than 860km away, that' why i want to stay in QRSS-600= first. So there might come a new distance record? In any case it will be exci= ting to me watching the new system running :-) Also it will be interesting= to see if the E-field antenna will get the signal! The primary winding of the TX coil is increased from 9 to 13 turns= due to the higher power that will be applied. Otherwise the current will beco= me to high. I will mount the amperemeter (analog, 1A) into the coil. That makes= it easier to adjust to resonance and watch the stability and maximum and average (estimation) current. Finally i will try to apply some copper rods into the earth and will= look how the antenna current is changing. The goal is to radiate 4mW ERP. Another goal is to reach as many sta= tions as possible. So i would be pleased if YOU would be one of them. :-) Since the QRM/QRN comes up in the late afternoon and transmitting fo= r 4...5 hours i will close at about 15 UTC. So the planned LF activity= is not affected :-). Sorry, but i cannot participate on the LF acty later sin= ce the VLF coil takes all the place in my car ;-) I looking forward to this experiment and wish you good luck and fun= by receiving :-) 73 es gl, Stefan/DK7FC PS: Could you give me a short feedback if you plan to be RX? ------=_NextPart_001_0011_01CAD2A0.8E94D7C0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
HI=20 Stefan,lf
 
the=20 computer is allready running,
 
good=20 luck
 
Victor
PA3FNY
-----Oorspronkelijk bericht-----
Van:= Stefan Sch=E4fer=20 [mailto:owner-rsgb_lf_group@blacksheep.org]Namens Stefan=20 Sch=E4fer
Verzonden: vrijdag 2 april 2010 2:39
Aan:<= /B>=20 rsgb_lf_group@blacksheep.org
Onderwerp: VLF: 4th VLF exper= iment by=20 DK7FC/p

Dear group,

After a break of one week i plan to transmit again on VLF / 8,97= kHz. If=20 the wind will be enough i will come up on saturday, 3. April, at= arround=20 10 UTC.

The DFCW-600 mode was a good choice in the last experiment, so i= will keep=20 this mode.

If Markus/DF6NM has time to make QSP on the mobile phone to the= reflector=20 (Markus ?) we could arrange various tests. I will also call other lo= cal=20 stations for reception reports during the transmission.

There will be some new components to test:

Today i started building up the 600W class D PA (at least 600W)= that is=20 directly fed out of the 230V (rectified) of the generator. PTT and= VFO input=20 is realised by fiber optic cables. The DC capacitor is 2000=B5F/350V= and can be=20 put on voltage without a NTC or charging resistor due to the relativ= ely high=20 output impedance of the small generator (tested). This works very fi= ne now.=20 Tomorrow i will apply the FETs and the big ferrite core and it's win= dings.=20 Then i will do a test on a dummy load at home. If the signal will be= 3dB=20 stronger, we could theoretically change to DFCW-300 compared to the= last=20 experiment. But there are many OMs writing private mails to me and= prepare to=20 be QRV on this next test. Some of them are using E-Field antennas an= d/or are=20 more than 860km away, that' why i want to stay in QRSS-600 first. So= there=20 might come a new distance record? In any case it will be exciting to= me=20 watching the new system running :-) Also it will be interesting to= see if the=20 E-field antenna will get the signal!

The primary winding of the TX coil is increased from 9 to 13 turn= s due to=20 the higher power that will be applied. Otherwise the current will be= come to=20 high.

I will mount the amperemeter (analog, 1A) into the coil. That mak= es it=20 easier to adjust to resonance and watch the stability and maximum an= d average=20 (estimation) current.

Finally i will try to apply some copper rods into the earth and= will look=20 how the antenna current is changing.

The goal is to radiate 4mW ERP. Another goal is to reach as many= stations=20 as possible. So i would be pleased if YOU would be one of them. :-)<= /P>

Since the QRM/QRN comes up in the late afternoon and transmitting= for 4...5=20 hours i will close at about 15 UTC. So the planned LF activity is no= t affected=20 :-). Sorry, but i cannot participate on the LF acty later since the= VLF coil=20 takes all the place in my car ;-)

I looking forward to this experiment and wish you good luck and= fun by=20 receiving  :-)

73 es gl, Stefan/DK7FC

PS: Could you give me a short feedback if you plan to be RX?

 

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