Return-Path: Received: from mtain-dh04.r1000.mx.aol.com (mtain-dh04.r1000.mx.aol.com [172.29.65.24]) by air-da10.mail.aol.com (v129.4) with ESMTP id MAILINDA102-861a4bee8b5d80; Sat, 15 May 2010 07:54:05 -0400 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mtain-dh04.r1000.mx.aol.com (Internet Inbound) with ESMTP id A76BD380000B6; Sat, 15 May 2010 07:54:03 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1ODFvd-0004bO-5Z for rs_out_1@blacksheep.org; Sat, 15 May 2010 12:53:13 +0100 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1ODFvc-0004bF-P2 for rsgb_lf_group@blacksheep.org; Sat, 15 May 2010 12:53:12 +0100 Received: from relay2.uni-heidelberg.de ([129.206.210.211]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1ODFvb-0004zE-Du for rsgb_lf_group@blacksheep.org; Sat, 15 May 2010 12:53:12 +0100 Received: from freitag.iup.uni-heidelberg.de (freitag.iup.uni-heidelberg.de [129.206.29.204]) by relay2.uni-heidelberg.de (8.13.8/8.13.8) with ESMTP id o4FBqxSY006616 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO) for ; Sat, 15 May 2010 13:52:59 +0200 Received: from [129.206.29.99] (pc99.iup.uni-heidelberg.de [129.206.29.99]) by freitag.iup.uni-heidelberg.de (8.12.11.20060308/8.11.2) with ESMTP id o4FBrAsZ007934 for ; Sat, 15 May 2010 13:53:10 +0200 Message-ID: <4BEE8B1B.502@iup.uni-heidelberg.de> Date: Sat, 15 May 2010 13:52:59 +0200 From: =?ISO-8859-1?Q?Stefan_Sch=E4fer?= User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; de; rv:1.9.1.8) Gecko/20100227 Thunderbird/3.0.3 MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org References: <002701caf394$44cbd980$0401a8c0@xphd97xgq27nyf> In-Reply-To: <002701caf394$44cbd980$0401a8c0@xphd97xgq27nyf> X-Spam-Score: 1.4 (+) X-Spam-Report: autolearn=disabled,HTML_MESSAGE=0.001,RATWARE_GECKO_BUILD=1.426 Subject: Re: LF: ref LD30 Content-Type: multipart/alternative; boundary="------------070305050607040008030600" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.8 required=5.0 tests=HTML_30_40,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: 3039ac1d41184bee8b5b4de3 X-AOL-IP: 193.82.116.20 X-Mailer: Unknown (No Version) --------------070305050607040008030600 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Mal, I assume you know your antenna capacitance so you can easily calculate your needed inductance. Or, if you know your L for 137kHz, it will be about (137/9)^2 at 9 kHz! Stefan/DK7FC Am 14.05.2010 20:35, schrieb mal hamilton: > Well, I am getting 15v sine wave into a 50 ohm DL with the LD30, > this looks promising. All I need now is a 500W audio amp suitably > matched into 50 ohms. > I prefer to keep a standard 50 ohm system for measuring purposesd. > or > I could change the 15v to sq wave and build a class D fet amp, maybe a > better approach. > If I proceed the Ant system would consist of 3 x inv L antennas in > parallel, height about 100 ft and each one about 500 ft horizontal. > Will have to calculate the loading coil L maybe less than 1 H with > some luck > This is just a proposal at present > de mal/g3kev --------------070305050607040008030600 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Mal,

I assume you know your antenna capacitance so you can easily calculate your needed inductance. Or, if you know your L for 137kHz, it will be about (137/9)^2 at 9 kHz!

Stefan/DK7FC

Am 14.05.2010 20:35, schrieb mal hamilton:

Well, I am getting 15v sine wave into a 50 ohm DL with the LD30, this looks promising. All I need now is a 500W audio amp suitably matched into 50 ohms.

I prefer to keep a standard 50 ohm system for measuring purposesd.

or

I could change the 15v to sq wave and build a class D fet amp, maybe a better approach.

If I proceed the Ant system would consist of 3 x inv L antennas in parallel, height about 100 ft and each one about 500 ft horizontal.

Will have to calculate the loading coil L maybe less than 1 H with some luck

This is just a proposal at present

de mal/g3kev

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