X-GM-THRID: 1214427034195944131 X-Gmail-Labels: rsgb lf X-Gmail-Received: 70f4713f88c87c738be04148305389a4e7ef7ade Delivered-To: daveyxm@gmail.com Received: by 10.64.250.20 with SMTP id x20cs890259qbh; Wed, 13 Sep 2006 10:17:52 -0700 (PDT) Received: by 10.49.93.13 with SMTP id v13mr11136027nfl; Wed, 13 Sep 2006 10:17:51 -0700 (PDT) Return-Path: Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mx.gmail.com with ESMTP id x24si17572668nfb.2006.09.13.10.17.50; Wed, 13 Sep 2006 10:17:51 -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 1GNYHT-0006T2-TT for rs_out_1@blacksheep.org; Wed, 13 Sep 2006 18:12:11 +0100 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1GNYHT-0006St-6M for rsgb_lf_group@blacksheep.org; Wed, 13 Sep 2006 18:12:11 +0100 Received: from smtp4.versatel.nl ([62.58.50.91]) by relay1.thorcom.net with esmtp (Exim 4.62) (envelope-from ) id 1GNYHP-0004wP-Ae for rsgb_lf_group@blacksheep.org; Wed, 13 Sep 2006 18:12:11 +0100 Received: (qmail 7905 invoked by uid 0); 13 Sep 2006 17:10:48 -0000 Received: from unknown (HELO fujitsu) ([62.59.190.96]) (envelope-sender ) by smtp4.versatel.nl (qmail-ldap-1.03) with SMTP for < >; 13 Sep 2006 17:10:48 -0000 Message-ID: <000801c6d757$0c6af2e0$60be3b3e@fujitsu> From: "Dick" To: Date: Wed, 13 Sep 2006 19:06:26 +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: 0.9 (/) X-Spam-Report: autolearn=disabled,AWL=-0.057,DNS_FROM_RFC_ABUSE=0.374,FROM_ENDS_IN_NUMS=0.516,HTML_60_70=0.027,HTML_MESSAGE=0.001 Subject: LF: antenna calculation..help needed Content-Type: multipart/alternative; boundary="----=_NextPart_000_0005_01C6D767.B6740D20" 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: 4359 This is a multi-part message in MIME format. ------=_NextPart_000_0005_01C6D767.B6740D20 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hello all, It's off topic, but as I can't find it on the net I'll ask it here. I want to modify an old 27MHz CB antenna to an quarter wave vertical for = 30m (10.14MHz) Diameter is tapering from 26 to 15mm. Question: what length should it have? I suppose 0.25 wavelength x 0.96 = or so... Sofar not a big problem, but as I will use 36 radials direct on the = ground, it's radiation resitance will be around 36Ohm. To match this to 50Ohm I can use a series capacitor, but what value this = should be?? Who can tell me? 73 Dick, pa4vhf ------=_NextPart_000_0005_01C6D767.B6740D20 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Hello all,
 
It's off topic, but as I can't find it = on the net=20 I'll ask it here.
 
I want to modify an old 27MHz CB = antenna to an=20 quarter wave vertical for 30m (10.14MHz)
 
Diameter is tapering from 26 to = 15mm.
 
Question: what length should it have? I = suppose=20 0.25 wavelength x 0.96 or so...
 
Sofar not a big problem, but as I will = use 36=20 radials direct on the ground, it's radiation resitance will = be
around 36Ohm.
 
To match this to 50Ohm I can use a = series=20 capacitor, but what value this should be??
 
Who can tell me?
 
73
 
Dick, pa4vhf
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