Return-Path: Received: from mtain-md01.r1000.mx.aol.com (mtain-md01.r1000.mx.aol.com [172.29.96.85]) by air-ma01.mail.aol.com (v129.4) with ESMTP id MAILINMA011-b4ef4bee94fa195; Sat, 15 May 2010 08:35:06 -0400 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mtain-md01.r1000.mx.aol.com (Internet Inbound) with ESMTP id D2F9238000132; Sat, 15 May 2010 08:35:04 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1ODGZK-0006So-SJ for rs_out_1@blacksheep.org; Sat, 15 May 2010 13:34:14 +0100 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1ODGZK-0006Sf-EH for rsgb_lf_group@blacksheep.org; Sat, 15 May 2010 13:34:14 +0100 Received: from out1.ip06ir2.opaltelecom.net ([62.24.128.242]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1ODGZI-0005jp-C5 for rsgb_lf_group@blacksheep.org; Sat, 15 May 2010 13:34:14 +0100 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AnMKAJcx7ksCYhU7/2dsb2JhbACSA4t7A3G6OYUQBA X-IronPort-AV: E=Sophos;i="4.53,236,1272841200"; d="scan'208,217";a="458907732" Received: from unknown (HELO xphd97xgq27nyf) ([2.98.21.59]) by out1.ip06ir2.opaltelecom.net with SMTP; 15 May 2010 13:34:04 +0100 Message-ID: <001101caf42a$e6d987e0$0401a8c0@xphd97xgq27nyf> From: "mal hamilton" To: References: <002701caf394$44cbd980$0401a8c0@xphd97xgq27nyf> <4BEE8B1B.502@iup.uni-heidelberg.de> <4BEE8E75.3050506@iup.uni-heidelberg.de> Date: Sat, 15 May 2010 13:34:02 +0100 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2600.0000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2600.0000 X-Spam-Score: 0.2 (/) X-Spam-Report: autolearn=disabled,HTML_MESSAGE=0.001,RCVD_ILLEGAL_IP=0.234 Subject: Re: LF: ref LD30 Content-Type: multipart/alternative; boundary="----=_NextPart_000_000E_01CAF433.4851A4A0" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: * X-Spam-Status: No, hits=1.4 required=5.0 tests=HTML_30_40,HTML_MESSAGE, HTML_TITLE_EMPTY 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: 3039ac1d60554bee94f8548c X-AOL-IP: 193.82.116.20 ------=_NextPart_000_000E_01CAF433.4851A4A0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Stefan My Loading coil inductance at 137 is around 0.5mH therefore at 9 kHz= it should be roughly 116 mH. Not such a big coil in my case. Tnx info de Mal/g3kev ----- Original Message -----=20 From: Stefan Sch=E4fer=20 To: rsgb_lf_group@blacksheep.org=20 Sent: Saturday, May 15, 2010 1:07 PM Subject: Re: LF: ref LD30 ...means L(9kHz) =3D L(137kHz)*232 Am 15.05.2010 13:52, schrieb Stefan Sch=E4fer:=20 Mal,=20 I assume you know your antenna capacitance so you can easily calcu= late your needed inductance. Or, if you know your L for 137kHz, it wil= l be about (137/9)^2 at 9 kHz! Stefan/DK7FC Am 14.05.2010 20:35, schrieb mal hamilton:=20 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 suitab= ly matched into 50 ohms. I prefer to keep a standard 50 ohm system for measuring purposes= d. 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 wi= th some luck This is just a proposal at present de mal/g3kev ------=_NextPart_000_000E_01CAF433.4851A4A0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Stefan
My Loading coil inductance at 137 is= around 0.5mH=20 therefore at 9 kHz it should be roughly 116 mH. Not such a big coil in= my=20 case.
Tnx info de Mal/g3kev
 
----- Original Message -----
Sent: Saturday, May 15, 2010= 1:07=20 PM
Subject: Re: LF: ref LD30

...means L(9kHz) =3D L(137kHz)*232



Am=20 15.05.2010 13:52, schrieb Stefan Sch=E4fer:=20
Mal,=20

I assume you know your antenna capacitance so you can easi= ly=20 calculate your needed inductance. Or, if you know your L for 137kH= z, it will=20 be about (137/9)^2 at 9 kHz!

Stefan/DK7FC


Am 14.= 05.2010=20 20:35, schrieb mal hamilton:=20
    Well, I am= getting 15v=20 sine wave into a 50 ohm DL with the LD30, this looks promising.= All I need=20 now is a 500W audio amp suitably matched into 50 ohms.
I prefer to keep a standard 50= ohm system for=20 measuring purposesd.
or
I could change the 15v to sq wa= ve and build a=20 class D fet amp, maybe a better approach.
If I proceed the Ant system wou= ld consist of=20 3 x inv L antennas in parallel, height about 100 ft and each one= about 500=20 ft horizontal.
Will have to calculate the load= ing coil L=20 maybe less than 1 H with some luck
This is just a proposal at=20 present
de mal/g3kev
 
 
 
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