X-GM-THRID: 1211447219938432696 X-Gmail-Labels: rsgb lf X-Gmail-Received: cd9bf37f1798d57da2066f66af610db728d43323 Delivered-To: daveyxm@gmail.com Received: by 10.64.249.16 with SMTP id w16cs126156qbh; Fri, 11 Aug 2006 12:54:59 -0700 (PDT) Received: by 10.48.230.18 with SMTP id c18mr4219347nfh; Fri, 11 Aug 2006 12:54:59 -0700 (PDT) Return-Path: Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mx.gmail.com with ESMTP id h1si4280787nfe.2006.08.11.12.54.58; Fri, 11 Aug 2006 12:54:59 -0700 (PDT) Received-SPF: neutral (gmail.com: 193.82.116.20 is neither permitted nor denied by best guess record for domain of owner-rsgb_lf_group@blacksheep.org) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1GBd0a-0000ud-6X for rs_out_1@blacksheep.org; Fri, 11 Aug 2006 20:49:28 +0100 Received: from [193.82.59.130] (helo=relay2.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1GBd0Z-0000uU-Ia for rsgb_lf_group@blacksheep.org; Fri, 11 Aug 2006 20:49:27 +0100 Received: from smtp1.versatel.nl ([62.58.50.88]) by relay2.thorcom.net with esmtp (Exim 4.51) id 1GBd0V-0005mB-6m for rsgb_lf_group@blacksheep.org; Fri, 11 Aug 2006 20:49:27 +0100 Received: (qmail 2404 invoked by uid 0); 11 Aug 2006 19:49:13 -0000 Received: from unknown (HELO fujitsu) ([62.59.190.99]) (envelope-sender ) by smtp1.versatel.nl (qmail-ldap-1.03) with SMTP for < >; 11 Aug 2006 19:49:13 -0000 Message-ID: <000801c6bd7e$c7a2c4e0$63be3b3e@fujitsu> From: "Dick" To: Date: Fri, 11 Aug 2006 21:45:13 +0200 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1478 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1478 X-Spam-Score: -0.1 (/) X-Spam-Report: autolearn=disabled,AWL=-0.685,FROM_ENDS_IN_NUMS=0.516,HTML_60_70=0.027,HTML_MESSAGE=0.001 Subject: LF: antenna: how to get max. capacity Content-Type: multipart/alternative; boundary="----=_NextPart_000_0005_01C6BD8F.6D1E19A0" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: * X-Spam-Status: No, hits=1.3 required=5.0 tests=FROM_ENDS_IN_NUMS,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 Status: O X-Status: X-Keywords: X-UID: 5080 This is a multi-part message in MIME format. ------=_NextPart_000_0005_01C6BD8F.6D1E19A0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hello all, In order to test my 136kHz TX at home, I just have installed a toploaded = wire in the backgarden. It measured only 135pF, which is too low, because need around 10mH to = get that running on 136...... System is as follows: 2 wires each 7.5m long mounted parallel (spacing 30cm), at both ends = connected together, and in the center connected together. >From the center an about 7m long wire goes vertical downward to the TX. Any suggestions how to get more capacitance in the air? I am limited in options, because the topload has an maximum length of = 7.5m, and maximum width of 1m. Some ideas I have: -opening up the ends -adding a third wire in de middle, feed it there and then bending the = rest, a kind of Z-shapped topload, center fed. Would be happy to get 40 - 50pF extra up in the air....... 73 Dick, PA4VHF ------=_NextPart_000_0005_01C6BD8F.6D1E19A0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Hello all,

In order to test my 136kHz TX at home, = I just have=20 installed a toploaded wire in the backgarden.

It measured only 135pF, which is too = low, because=20 need around 10mH to get that running on 136......

System is as follows:

2 wires each 7.5m long mounted parallel = (spacing=20 30cm), at both ends connected together, and in

the center connected = together.

From the center an about 7m long wire = goes vertical=20 downward to the TX.

Any suggestions how to get more = capacitance in the=20 air?

I am limited in options, because the = topload has an=20 maximum length of 7.5m, and maximum width of 1m.

Some ideas I have:

-opening up the ends

-adding a third wire in de middle, feed = it there=20 and then bending the rest, a kind of Z-shapped topload, center = fed.

Would be happy to get 40 - 50pF extra = up in the=20 air.......

Dick, PA4VHF

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