Return-Path: Received: from mtain-db07.r1000.mx.aol.com (mtain-db07.r1000.mx.aol.com [172.29.64.91]) by air-mc04.mail.aol.com (v128.1) with ESMTP id MAILINMC041-a92e4bb62b6b1d; Fri, 02 Apr 2010 13:37:47 -0400 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mtain-db07.r1000.mx.aol.com (Internet Inbound) with ESMTP id 28CFB380000AE; Fri, 2 Apr 2010 13:37:45 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1NxknZ-0003Q0-J2 for rs_out_1@blacksheep.org; Fri, 02 Apr 2010 18:36:49 +0100 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1NxknY-0003Pr-VU for rsgb_lf_group@blacksheep.org; Fri, 02 Apr 2010 18:36:48 +0100 Received: from cpsmtpm-eml108.kpnxchange.com ([195.121.3.12]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1NxknW-0006Zp-Bs for rsgb_lf_group@blacksheep.org; Fri, 02 Apr 2010 18:36:48 +0100 Received: from ns94d01ae4d850 ([81.204.139.159]) by CPSMTPM-EML108.kpnxchange.com with Microsoft SMTPSVC(7.0.6001.18000); Fri, 2 Apr 2010 19:36:34 +0200 Message-ID: From: "henny van elst" To: References: <001d01cad190$aa92e590$0901a8c0@lark><841031C22EC944FEB2BB3E1DC237717E@acer3f31164f8b><38A51B74B884D74083D7950AD0DD85E82A1BBF@File-Server-HST.hst.e-technik.tu-darmstadt.de> <38A51B74B884D74083D7950AD0DD85E82A1BC2@File-Server-HST.hst.e-technik.tu-darmstadt.de> Date: Fri, 2 Apr 2010 19:36:32 +0200 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 X-OriginalArrivalTime: 02 Apr 2010 17:36:34.0084 (UTC) FILETIME=[09D6CE40:01CAD28B] X-Spam-Score: 3.4 (+++) X-Spam-Report: autolearn=disabled,FORGED_MUA_OUTLOOK=3.36,HTML_MESSAGE=0.001 Subject: Re: VLF: 4th VLF experiment by DK7FC/p Content-Type: multipart/alternative; boundary="----=_NextPart_000_001D_01CAD29B.CCB72940" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: ** X-Spam-Status: No, hits=2.1 required=5.0 tests=FORGED_MUA_OUTLOOK,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-sid: 3039ac1d405b4bb62b6960f2 X-AOL-IP: 193.82.116.20 ------=_NextPart_000_001D_01CAD29B.CCB72940 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hi,Stefan, I also look for You to morrow, Henny pa3cpm. 73s ----- Original Message -----=20 From: Stefan Sch=E4fer=20 To: rsgb_lf_group@blacksheep.org=20 Sent: Friday, April 02, 2010 1:09 PM Subject: AW: VLF: 4th VLF experiment by DK7FC/p Hi Gary, VLF, LF, The locator is JN49IS. In older mails i have given you the exact coo= rdinates. In google maps you can find the QTH within a sector of some= 10m. QRG is 8,97000 kHz. The 4mHz settings is optimal! If the SNR will be= good, you can try 8mHz as well or 15, like Markus did it at the end= of the tests. 15mHz seems to be optimal for DFCW-120 but i will start= with DFCW-600... I will have no internet access until saturday night, so cu after the= experiment. Hopefully the wind will be strong enough, the forecast shows about= 20km/h from south. This would be enough... Best 73 es gd RX! :-) Stefan/DK7FC ----------------------------------------------------------------------= -------- Von: owner-rsgb_lf_group@blacksheep.org im Auftrag von Gary - G4WGT Gesendet: Fr 02.04.2010 11:52 An: rsgb_lf_group@blacksheep.org Betreff: Re: VLF: 4th VLF experiment by DK7FC/p Hi Stefan, LF,=20 I will be monitoring your frequency using a M0BMU type 30 turn 0.8M= square loop and 9kHz pre-amp into my PC sound card, software is SpecL= ab running Marcus's "9kHz_4mHz" configuration. This loop system has in= creased my reception of the Alpha signals by about 10db giving up to= 25db SNR. Thanks to Jim for a great design. Stefan, can you tell me the QTH locator for your Tx site please. Good luck with the 4th test. 73 Gary - G4WGT. 2010/4/2 Stefan Sch=E4fer Dear group, 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 arround 10 UTC. The DFCW-600 mode was a good choice in the last experiment, so i= will keep this mode. If Markus/DF6NM has time to make QSP on the mobile phone to the re= flector (Markus ?) we could arrange various tests. I will also call ot= her local 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) th= at 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 res= istor due to the relatively high output impedance of the small generat= or (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 th= eoretically change to DFCW-300 compared to the last experiment. But th= ere are many OMs writing private mails to me and prepare to be QRV on= this next test. Some of them are using E-Field antennas and/or are mo= re than 860km away, that' why i want to stay in QRSS-600 first. So the= re might come a new distance record? In any case it will be exciting= 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 become to high. I will mount the amperemeter (analog, 1A) into the coil. That make= s 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 wi= ll look how the antenna current is changing. The goal is to radiate 4mW ERP. Another goal is to reach as many= stations as possible. So i would be pleased if YOU would be one of th= em. :-) Since the QRM/QRN comes up in the late afternoon and transmitting= for 4...5 hours i will close at about 15 UTC. So the planned LF activ= ity is not affected :-). Sorry, but i cannot participate on the LF act= y later since the VLF coil takes all the place in my car ;-) I looking forward to this experiment and wish you good luck and fu= n by receiving :-) 73 es gl, Stefan/DK7FC PS: Could you give me a short feedback if you plan to be RX? ----------------------------------------------------------------------= -------- No virus found in this incoming message. Checked by AVG - www.avg.com=20 Version: 8.5.437 / Virus Database: 271.1.1/2784 - Release Date: 04/0= 1/10 18:32:00 ------=_NextPart_000_001D_01CAD29B.CCB72940 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Hi,Stefan,
 
I also look for You to morrow,=
Henny pa3cpm.
73s
----- Original Message -----
Sent: Friday, April 02, 2010= 1:09=20 PM
Subject: AW: VLF: 4th VLF exp= eriment by=20 DK7FC/p

Hi Gary,= VLF,=20 LF,
 
The locator is JN49IS. In= older mails i=20 have given you the exact coordinates. In google maps you can find th= e QTH=20 within a sector of some 10m.
 
QRG is 8,97000 kHz. The= 4mHz settings is=20 optimal! If the SNR will be good, you can try 8mHz as well or 15, li= ke Markus=20 did it at the end of the tests. 15mHz seems to be optimal for DFCW-1= 20 but i=20 will start with DFCW-600...
 
I will have no internet= access until=20 saturday night, so cu after the experiment.
Hopefully the wind will= be strong enough,=20 the forecast shows about 20km/h from south. This would be=20 enough...
 
Best 73 es gd RX! :-)
 
Stefan/DK7FC
=

Von: owner-rsgb_lf_group@blacksh= eep.org im=20 Auftrag von Gary - G4WGT
Gesendet: Fr 02.04.2010 11:52
= An:=20 rsgb_lf_group@blacksheep.org
Betreff: Re: VLF: 4th VLF exp= eriment by=20 DK7FC/p

Hi Stefan, LF,=20

I will be monitoring your frequency using a M0BMU type 30 turn= 0.8M=20 square loop and 9kHz pre-amp into my PC sound card, software is Spec= Lab=20 running Marcus's "9kHz_4mHz" configuration. This loop system has inc= reased my=20 reception of the Alpha signals by about 10db giving up to 25db SNR.= Thanks to=20 Jim for a great design.

Stefan, can you tell me the QTH locator for your Tx site please= .

Good luck with the 4th test.

73

Gary - G4WGT.


2010/4/2 Stefan Sch=E4fer &= lt;schaefer@hst.tu= -darmstadt.de>
Dear=20 group,

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

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

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

There will be some new components= to=20 test:

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

The primary win= ding of=20 the TX coil is increased from 9 to 13 turns due to the higher powe= r that=20 will be applied. Otherwise the current will become to high.
I will=20 mount the amperemeter (analog, 1A) into the coil. That makes it ea= sier to=20 adjust to resonance and watch the stability and maximum and averag= e=20 (estimation) current.

Finally i will try to apply some copp= er rods=20 into the earth and will look how the antenna current is changing.<= BR>
The=20 goal is to radiate 4mW ERP. Another goal is to reach as many stati= ons as=20 possible. So i would be pleased if YOU would be one of them.=20 :-)

Since the QRM/QRN comes up in the late afternoon and tr= ansmitting=20 for 4...5 hours i will close at about 15 UTC. So the planned LF ac= tivity is=20 not affected :-). Sorry, but i cannot participate on the LF acty= later since=20 the VLF coil takes all the place in my car ;-)

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

73 es gl, Stefan/DK7FC

PS: Could you give= me a short=20 feedback if you plan to be=20 RX?





No virus found in this incoming message.
Checked by AV= G -=20 www.avg.com
Version: 8.5.437 / Virus Database: 271.1.1/2784 - Re= lease=20 Date: 04/01/10 18:32:00
------=_NextPart_000_001D_01CAD29B.CCB72940--