Return-Path: Received: from mtain-dc02.r1000.mx.aol.com (mtain-dc02.r1000.mx.aol.com [172.29.64.130]) by air-db07.mail.aol.com (v129.10) with ESMTP id MAILINDB072-86214dc3ae9a251; Fri, 06 May 2011 04:17:30 -0400 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-dc02.r1000.mx.aol.com (Internet Inbound) with ESMTP id DD6A2380000AB; Fri, 6 May 2011 04:17:27 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1QIGCc-0000TL-N9 for rs_out_1@blacksheep.org; Fri, 06 May 2011 09:15:58 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1QIGCc-0000TC-0W for rsgb_lf_group@blacksheep.org; Fri, 06 May 2011 09:15:58 +0100 Received: from relay2.uni-heidelberg.de ([129.206.210.211]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1QIGCa-0004qe-4o for rsgb_lf_group@blacksheep.org; Fri, 06 May 2011 09:15:57 +0100 Received: from ix.urz.uni-heidelberg.de (cyrus-portal.urz.uni-heidelberg.de [129.206.100.176]) by relay2.uni-heidelberg.de (8.13.8/8.13.8) with ESMTP id p468FtsK031831 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO) for ; Fri, 6 May 2011 10:15:55 +0200 Received: from extmail.urz.uni-heidelberg.de (extmail.urz.uni-heidelberg.de [129.206.100.140]) by ix.urz.uni-heidelberg.de (8.13.8/8.13.8) with ESMTP id p468FscP032713 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO) for ; Fri, 6 May 2011 10:15:54 +0200 Received: from [129.206.205.202] (vpn205-202.rzuser.uni-heidelberg.de [129.206.205.202]) by extmail.urz.uni-heidelberg.de (8.13.4/8.13.1) with ESMTP id p468FrbI015344 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO) for ; Fri, 6 May 2011 10:15:54 +0200 Message-ID: <4DC3AE4C.5000809@iup.uni-heidelberg.de> Date: Fri, 06 May 2011 10:16:12 +0200 From: =?windows-1252?Q?Stefan_Sch=E4fer?= User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; de; rv:1.9.1.11) Gecko/20100711 Thunderbird/3.0.6 MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org References: <37ab501b3c5848b7b5eebd9a1d099f3c@kabelmail.de> <002501cc0bc3$44aa6e10$0401a8c0@xphd97xgq27nyf> In-Reply-To: <002501cc0bc3$44aa6e10$0401a8c0@xphd97xgq27nyf> X-Spam-Score: 1.4 (+) X-Spam-Report: autolearn=disabled,HTML_MESSAGE=0.001,RATWARE_GECKO_BUILD=1.426 Subject: Re: VLF: DJ8WX Content-Type: multipart/alternative; boundary="------------010605090702090501030100" 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_40_50,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: 3039ac1d40824dc3ae9716cd X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none X-Mailer: Unknown (No Version) --------------010605090702090501030100 Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit 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 = Arm chair copy for the RX operator. > mal/g3kev > > ----- Original Message ----- > *From:* uwe-jannsen@kabelmail.de > *To:* rsgb_lf_group@blacksheep.org > > *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 ----- > *From:* uwe-jannsen@kabelmail.de > > *To:* rsgb_lf_group@blacksheep.org > > *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 shack. > 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 > --------------010605090702090501030100 Content-Type: text/html; charset=windows-1252 Content-Transfer-Encoding: quoted-printable X-MIME-Autoconverted: from 8bit to quoted-printable by relay2.uni-heidelberg.de id p468FtsK031831 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=A0=A0ie QRO es Big Antenna =3D Arm chair copy for the RX operator.
=A0
mal/g3kev
=A0
----- 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=A0ear ache at the RX end
de g3kev
=A0
=A0
----- Original Message -----
Sen= t: Thursday, May 05, 2011 6:18 PM
Sub= ject: Re: VLF: DJ8WX


Hi Stefan,

=A0

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=A0 are located in a shed at abt 90m from the shack.<= br> the shed is=A0 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=A0 limit because otherwise (751W) =A0my XYL would =A0agn shriek when touching her metal garden tools.

=A0

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).

=A0

GL

Uwe/dj8wx/jo43sv

=A0

=A0






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
--------------010605090702090501030100--