Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-dl06.r1000.mx.aol.com (Internet Inbound) with ESMTP id 7EE363800009C; Sun, 13 Jan 2013 14:37:55 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1TuTMI-0001yO-Lw for rs_out_1@blacksheep.org; Sun, 13 Jan 2013 19:36:42 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1TuTMI-0001yF-6B for rsgb_lf_group@blacksheep.org; Sun, 13 Jan 2013 19:36:42 +0000 Received: from mout.web.de ([212.227.17.12]) by relay1.thorcom.net with esmtp (Exim 4.77) (envelope-from ) id 1TuTMG-0002KO-3D for rsgb_lf_group@blacksheep.org; Sun, 13 Jan 2013 19:36:41 +0000 Received: from 3capp-webde-bs29.server.lan ([172.19.170.29]) by mriweb.server.lan (mriweb002) with ESMTPA (Nemesis) id 0M3OP8-1T3sjS4BJQ-00rHM5 for =?utf-8?q??= =?utf-8?q?;?= Sun, 13 Jan 2013 20:36:18 +0100 Received: from [217.84.53.87] by 3capp-webde-bs29.server.lan with HTTP; Sun Jan 13 20:36:18 CET 2013 MIME-Version: 1.0 Message-ID: From: "Hans-Albrecht Haffa" To: rsgb_lf_group@blacksheep.org Date: Sun, 13 Jan 2013 20:36:18 +0100 (CET) Importance: normal Sensitivity: Normal In-Reply-To: References: X-UI-Message-Type: mail X-Priority: 3 X-Provags-ID: V03:K0:O9yF61UtMs9wQQelr5CNcntkmAsInq7/lEWYk1RCXnx Xb0lRvU0Gp+BW586KBWStmUXRdr//2LH8sYuilnzMi9C/vOL1W bK8ooQuZ31JqjJ4DmHtKsch3g8B83W/dpLYBRg1hO3RM+22eke i0HcAOVTzSH9l3sPMkuyH3BMIjMWu6lHX6OLRkYRpkCH4L9K9V e9vIWtGRHekof87BvRGfSq216CT8LykMGsWviOy20DvIlYi+hd MAPTTFSRdPMUn6VNCReScoT0SuH/VOxBcSbwL0GT7LoWlzGgNl klH5VW6ixtt5bfuuU4cgEKlRh4j X-Spam-Score: 1.1 (+) X-Spam-Report: Spam detection software, running on the system "relay1.thorcom.net", has identified this incoming email as possible spam. The original message has been attached to this so you can view it (if it isn't spam) or label similar future email. If you have any questions, see the administrator of that system for details. Content preview: Dear Lowfers, Medfers, for suitabel matching I use a transformer (See Jerry Sevicks Balun Book, "Transmission line transformers", ARRL Publications) and a loading coil with variometer, for 1,8 MHz, 136 kHz and 472 kHz. Between HF and LF I use two Vac-Relais, (Normally open contact, abt. 30 kV/10 A from Jennings), 136 k and 472k I switch with banana plugs manually. Running to and fro for alignment of the variometers, I am using a Antenna Analyser in the shack (VA3 , Kit from Funkamateur.de) . Input resistance for 136k is about 300 Ohm, for 472 kHz abt. 60 Ohm. [...] Content analysis details: (1.1 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at http://www.dnswl.org/, no trust [212.227.17.12 listed in list.dnswl.org] 0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider (dk8nd[at]web.de) -0.0 RP_MATCHES_RCVD Envelope sender domain matches handover relay domain 0.0 HTML_MESSAGE BODY: HTML included in message 1.1 MIME_HTML_ONLY BODY: Message only has text/html MIME parts X-Scan-Signature: b0c81be0f3328ec24fe2fd5b2fd44f86 Subject: Aw: AW: LF: Variometer es Loading coils, from DK 8 ND Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: * X-Spam-Status: No, hits=1.1 required=5.0 tests=HTML_60_70, HTML_FONTCOLOR_UNKNOWN,HTML_MESSAGE,MIME_HTML_ONLY,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: 3039ac1d4ad450f30d13329f X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none
Dear Lowfers, Medfers,

for suitabe= l matching  I use a transformer (See Jerry Sevicks Balun Book, "T= ransmission line transformers", ARRL Publications) and a loading coil = with variometer, for 1,8 MHz, 136 kHz and 472 kHz. Between HF and LF I use = two Vac-Relais, (Normally open contact, abt. 30 kV/10 A from Jennings), 136= k and 472k I switch with banana plugs manually.  Running to and fro f= or alignment of the variometers, I am using a Antenna Analyser in the shack= (VA3 , Kit from Funkamateur.de) . Input resistance for 136k is about 300 O= hm, for 472 kHz abt. 60 Ohm.

Parallel to th= e metal marconi vertical antenna are two Fiberglas rods, 10 m and 12 m, tun= ed for 7 MHz and 3,5 MHz as short helix Antennas.
I do not = know, if the present solution (used in three different qths) has disadsvant= ages for LF, that I did not realize till now.

My proposal:
- Resonant circuit in the stile of VK2AOU as= base loading coil
- Or using two Helix-Antennas tuned for 4= 72k and 136k parallel in HB9ASB-Style. How mutch the two rods must be space= d, that the electric fields are not partially shorted? Think of the influen= ce of trees near to the antenna at 136k.
Anyway I recomend u= sing two loading coils or two variometers with separate drives.
=
A not extremely cheap possibility is an electric cylinder as drive for= the variometer.

http://produkt.conrad.de/45= 973183/elektrozylinder.htm

55, Hans-Albrecht=
DK 8 ND









=
Gesendet: Sonntag, 1= 3. Januar 2013 um 19:44 Uhr
Von: "Joe DF2JP&q= uot; <df2jp@gmx.de>
An: rsgb_lf_group@blacks= heep.org
Betreff: AW: LF: Variometer es Loading c= oils

Hi Stefan, LF

 

I´ve just fixed my antennaswitch today.

It´s = a ceramic switch 4” diameter, fit well into on of these gray HT-Tube.=

But it is switched manually.

Will check if it works with my 17,= 5 kV on LF next days.

 

https://www.dropbox.com/s/t6p= yjfhsecykg9n/antswitch1.jpg

 

https://www.dropbox.com/s/pyll4voh7ieavwe/antswitch3.jpg

 

73 Joe

 

Von: owner-rsgb_lf_group@blacksheep.org= [mailto:owner-rsgb_lf_group@blacksheep.org] Im Auftrag von Stefan Schäfer
Gesendet: Sonntag, 13. Januar 2013 17:39=
An: rsgb_lf_group@bl= acksheep.org
Betreff:= Re: LF: Variometer es Loading coils

 

= Sri, typos:

Am 13.01.2013 17:29, schrieb Stefa= n Schäfer:

...on LF.


=

  and a = high inductance of the transformer then the 50 Ohm side is...=

when