Return-Path: Received: from mtain-dg02.r1000.mx.aol.com (mtain-dg02.r1000.mx.aol.com [172.29.65.10]) by air-dd02.mail.aol.com (v129.10) with ESMTP id MAILINDD023-86584dc452512b; Fri, 06 May 2011 15:56:01 -0400 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-dg02.r1000.mx.aol.com (Internet Inbound) with ESMTP id C5204380000CE; Fri, 6 May 2011 15:55:58 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1QIR7F-0004Af-S7 for rs_out_1@blacksheep.org; Fri, 06 May 2011 20:55:09 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1QIR7F-0004AW-8J for rsgb_lf_group@blacksheep.org; Fri, 06 May 2011 20:55:09 +0100 Received: from smtpa1.mediabeam.com ([194.25.41.13] helo=smtpa2.mediabeam.com) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1QIR7D-0008V8-Fx for rsgb_lf_group@blacksheep.org; Fri, 06 May 2011 20:55:09 +0100 Received: from UMS02-SMTP3 (balancer04.mediabeam.com [10.100.1.40]) by smtpa2.mediabeam.com (8.13.8/8.13.1) with ESMTP id p46Jsw4O009214 for ; Fri, 6 May 2011 21:55:01 +0200 From: uwe-jannsen@kabelmail.de To: rsgb_lf_group@blacksheep.org Message-ID: <7ba9f9f9dc38423ab1a4193c14595133@kabelmail.de> Date: Fri, 06 May 2011 21:54:57 +0200 X-Priority: 3 (Normal) MIME-Version: 1.0 X-Spam-Score: 0.6 (/) X-Spam-Report: autolearn=disabled,HTML_MESSAGE=0.001,NO_REAL_NAME=0.55 Subject: Re: Re: VLF: DJ8WX Content-Type: multipart/alternative; boundary="----0B694EB23EC941D7822753B074376649" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: * X-Spam-Status: No, hits=1.6 required=5.0 tests=HTML_40_50,HTML_MESSAGE, NO_REAL_NAME,PRIORITY_NO_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-sid: 3039ac1d410a4dc4524e5b16 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none X-Mailer: Unknown (No Version) ------0B694EB23EC941D7822753B074376649 Content-Type: text/plain; charset=Windows-1252 Content-Transfer-Encoding: quoted-printable Hi all, Stefan, the DC R of the coils in toto is 107,5 Ohm and the L is 284mH. = =20 Your idea to arrange the coils in a pile made me brooding for a while. = =20 solution: nearby the shed is located a stand (raised hide) abt 4,5m high.= =20 Ill modify it, means to =93gut=94 it, means removing the floor =20 and install a rack to fasten the coils =20 and find some materials to coat the lower part of the tower =20 and =20 and =20 so Ill be busy outdoors and the stn wont be on the air coming weeks. =20 The last transmission stopped at 1028UTC today. =20 GL =20 Uwe/dj8wx =20 Von: rsgb_lf_group@blacksheep.org Gesendet: 06.05.2011 10:16 An: rsgb_lf_group@blacksheep.org Betreff: Re: VLF: DJ8WX Uwe, QRO, big antenna and a low loss coil!=20 Uwe, i somewhere saw a photo of your loading coil. It consists of 3 coils= that are separately placed, so not magnetically coupled. You may improve= things if you couple them (i.e. put one above the other), This results in= a higher L (yes yes, some losses come up as well) and so you maybe can ta= ke out one of them and reduce the losses in that way. This may be the easiest way to increase efficiency but it does not solve= your high voltage problem ;-) To reduce the voltages you need more wire= in more height and then, less L. BTW, do you know the DC resistance of your overall loading coil? 73, Stefan Am 06.05.2011 09:57, schrieb mal hamilton: =20 Uwe=20 Go for BOTH=A0=A0ie QRO es Big Antenna =3D Arm chair copy for the RX opera= tor.=20 mal/g3kev=20 ----- Original Message ----- =20 From: uwe-jannsen@kabelmail.de =20 To: rsgb_lf_group@blacksheep.org =20 Sent: Thursday, May 05, 2011 9:07 PM=20 Subject: Re: Re: VLF: DJ8WX=20 Hi Mal, instead of QRO I would prefer a more effectiv antenna. I feel the day will come.=20 GL Uwe/dj8wx Von: rsgb_lf_group@blacksheep.org Gesendet: 05.05.2011 18:35 An: rsgb_lf_group@blacksheep.org Betreff: Re: VLF: DJ8WX Uwe=20 I can see u mean business with plenty of QRO, this should be the aim for= all LF operators to avoid eye strain and=A0ear ache at the RX end=20 de g3kev=20 ----- Original Message ----- =20 From: uwe-jannsen@kabelmail.de =20 To: rsgb_lf_group@blacksheep.org =20 Sent: Thursday, May 05, 2011 6:18 PM=20 Subject: Re: VLF: DJ8WX=20 Hi Stefan, =20 The stn was on the air from yesterday 1442UTC until today 0856UTC =20 and sporadic ZOA in mode QRS30. =20 I didnt measure the PA output and I didnt measure the aerial current.=20 matching coils and PA=A0 are located in a shed at abt 90m from the shack. the shed is=A0 shut. the key is somewhere hidden. but Im doing something else: Im trying to meassure the FS using calibrate= d aerial and RX (ESH3). but until now the noise makes the results problematic. so I have to increase the output pwr step by step (day by day). old days max pwr is not reached today. I estimate todays output pwr of 45= 0W. =20 the max would be 750W. 750W is the=A0 limit because otherwise (751W) =A0my XYL would =A0agn shrie= k when touching her metal garden tools. =20 Oh horror: neighbors boy climbed our fence and asked my wife if the fence= wire is electric. No, she said, it isnt. =20 Secretly I connected a phasing tester to the fence wire: yes, it was (elec= tric). =20 GL =20 Uwe/dj8wx/jo43sv =20 Von: rsgb_lf_group@blacksheep.org Gesendet: 05.05.2011 12:52 An: rsgb_lf_group@blacksheep.org Betreff: VLF: DJ8WX VLF, Today DJ8WX is as strong as before (March 2011). About 20 dB SNR in 47=20 uHz and traces in the 600-window. Uwe, what is yout TX power and antenna current? What does your wife=20 think about that? :-) 73, Stefan/DK7FC ------0B694EB23EC941D7822753B074376649 Content-Type: text/html; charset=Windows-1252 Content-Transfer-Encoding: quoted-printable

Hi all,

Stefan, the DC R of the coils in toto is 107,5 Ohm and the L is 284mH.

 

Your idea to arrange the coils in a pile made me brooding= for a while.

 

solution: nearby the shed is located a stand (raised hide= ) abt 4,5m high.

 

Ill modify it, means to =93gut=94 it, means removing the= floor

and install a rack to fasten the coils

and find some materials to coat the lower part of the tow= er

and

and

 

so Ill be busy outdoors and the stn wont be on the air co= ming weeks.

 

The last transmission stopped at 1028UTC today.

 

GL

Uwe/dj8wx

 

 





Von: rsgb_lf_group@blacksheep.org
Gesendet: 06.05.2011 10:16
An: rsgb_lf_group@blacksheep.org
Betreff: Re: VLF: DJ8WX

Uwe,

QRO, big antenna and a= low loss coil!
Uwe, i somewhere saw a photo of your loading coil. It consists of 3 coils that are separately placed, so not magnetically coupled. You may improve things if you couple them (i.e. put one above the other), This results in a higher L (yes yes, some losses come up as well) and so you maybe can take out one of them and reduce the losses in that way.
This may be the easiest way to increase efficiency but it does not solve your high voltage problem ;-) To reduce the voltages you need more wire in more height and then, less L.

BTW, do you know the DC resistance of your overall loading coil?

73, Stefan

Am 06.05.2011 09:57, schrieb mal hamilton:
Uwe
Go for BOTH  ie QRO es= Big Antenna =3D Arm chair copy for the RX operator.
 
mal/g3kev
 
----- Original Message -----
Sent: Thursday, May 05, 2011 9:07 PM
Subject: Re: Re: VLF: DJ8WX

Hi Mal,

instead of QRO I would prefer a more effectiv antenna.
I feel the day will come.

GL
Uwe/dj8wx
Von: rsgb_lf_group@blacksheep.org
Gesendet: 05.05.2011 18:35
An: rsgb_lf_group@blacksheep.org
Betreff: Re: VLF: DJ8WX

Uwe
I can see u mean business with plenty of QRO, this should be the aim for all LF operators to avoid eye strain and ear ache at the RX end
de g3kev
 
 
----- Original Message -----
Sent: Thursday, May 05, 2011 6:18 PM
Subject: Re: VLF: DJ8WX


Hi Stefan,

 

The stn was on the air from yesterday 1442UTC until today 0856UTC

and sporadic ZOA in mode QRS30.


I didnt measure the PA output and I didnt measure the aerial current. matching coils and PA  are located in a shed at abt 90m from the shac= k.
the shed is  shut. the key is somewhere hidden.

but Im doing something else: Im trying to meassure the FS using calibrated aerial and RX (ESH3).
but until now the noise makes the results problematic.
so I have to increase the output pwr step by step (day by day).
old days max pwr is not reached today. I estimate todays output pwr of 450W.

the max would be 750W.

750W is the  limit because otherwise (751W)  my XYL would  agn shriek when touching her metal garden tools.

 

Oh horror: neighbors boy climbed our fence and asked my wife if the fence wire is electric. No, she said, it isnt.=

Secretly I connected a phasing tester to the fence wire: yes, it was (electric).

 

GL

Uwe/dj8wx/jo43sv

 

 






Von: rsgb_lf_group@blacksheep.org
Gesendet: 05.05.2011 12:52
An: rsgb_lf_group@blacksheep.org
Betreff: VLF: DJ8WX

VLF,

Today DJ8WX is as strong as before (March 2011). About 20 dB SNR in 47 uHz and traces in the 600-window.

Uwe, what is yout TX power and antenna current? What does your wife
think about that? :-)

73, Stefan/DK7FC
 ------0B694EB23EC941D7822753B074376649--