X-GM-THRID: 1243583819375807210 X-Gmail-Labels: rsgb lf Delivered-To: daveyxm@gmail.com Received: by 10.70.87.11 with SMTP id k11cs137174wxb; Wed, 1 Aug 2007 06:12:29 -0700 (PDT) Received: by 10.82.162.14 with SMTP id k14mr757573bue.1185973948792; Wed, 01 Aug 2007 06:12:28 -0700 (PDT) Return-Path: Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mx.google.com with ESMTP id i8si741324nfh.2007.08.01.06.12.24; Wed, 01 Aug 2007 06:12:28 -0700 (PDT) Received-SPF: neutral (google.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 1IGDvT-0000Lq-LJ for rs_out_1@blacksheep.org; Wed, 01 Aug 2007 14:07:43 +0100 Received: from [83.244.159.144] (helo=relay3.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1IGDvT-0000Lh-5v for rsgb_lf_group@blacksheep.org; Wed, 01 Aug 2007 14:07:43 +0100 Received: from mk-filter-3-a-1.mail.uk.tiscali.com ([212.74.100.54]) by relay3.thorcom.net with esmtp (Exim 4.63) (envelope-from <500kcs@uku.co.uk>) id 1IGDvS-000291-4L for rsgb_lf_group@blacksheep.org; Wed, 01 Aug 2007 14:07:43 +0100 X-Trace: 11519971-mk-filter-3.mail.uk.tiscali.com-B2C-$THROTTLED-DYNAMIC-CUSTOMER-DYNAMIC-IP X-SBRS: -3.0 X-RemoteIP: 80.225.126.10 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: Av8/AI4isEZQ4X4KRmdsb2JhbACCaYQDgTsMgRKEQQEBATU Received: from ppp-3-10.bris-b-2.access.uk.tiscali.com (HELO o) ([80.225.126.10]) by smtp.tiscali.co.uk with SMTP; 01 Aug 2007 14:06:33 +0100 Message-ID: <00a001c7d43c$f4180690$0a7ee150@o> From: "GW3UEP" <500kcs@uku.co.uk> To: References: <005001c7d3fe$e4786d80$6400a8c0@oem17oeylz9on8> <001901c7d42b$e6fbeaa0$86048351@w4o8m9> Date: Wed, 1 Aug 2007 14:07:04 +0100 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.2180 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,HTML_MESSAGE=0.001 Subject: LF: Re: Re: newbie help Content-Type: multipart/alternative; boundary="----=_NextPart_000_0099_01C7D445.3CEAA0F0" 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 Status: O X-Status: X-Keywords: X-UID: 2686 This is a multi-part message in MIME format. ------=_NextPart_000_0099_01C7D445.3CEAA0F0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Re ant cap: you can use a DMM [Rapid 328] to gnd - I use 1000pF across = its terminals to decouple RF for a stable reading. Simply subtract its = value. 73, Rog. ----- Original Message -----=20 From: James Moritz=20 To: rsgb_lf_group@blacksheep.org=20 Sent: Wednesday, August 01, 2007 12:05 PM Subject: LF: Re: newbie help Dear Paul, In a nutshell: - You can tune up more or less any bit of wire for reasonable results on = 500kHz. For best results, make it as high up as possible, and = secondarily as long as possible. An HF long wire, or dipole with feeders = strapped would be fine. -Work out the capacitance of the wire (see formulas on ON7YD's antennas = pages). and calculate the inductance for resonance around 502.5kHz. For = most HF-sized wire antennas, this will be of the order of 100s of uH. = The resulting coil is ------=_NextPart_000_0099_01C7D445.3CEAA0F0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Re ant cap: you can use a DMM [Rapid = 328] to=20 gnd  - I use 1000pF across its terminals to decouple RF for a = stable=20 reading. Simply subtract its value.
73, Rog.
 
----- Original Message -----=20
From: James Moritz
To: rsgb_lf_group@blacksheep.org= =20
Sent: Wednesday, August 01, 2007 12:05 PM
Subject: LF: Re: newbie help

Dear Paul,
 
In a nutshell:
 
- You can tune up more or less any bit = of wire for=20 reasonable results on 500kHz. For best results, make it as high up = as=20 possible, and secondarily as long as possible. An HF long wire, or = dipole with=20 feeders strapped would be fine.
 
-Work out the capacitance of the wire = (see formulas=20 on ON7YD's antennas pages). and calculate the inductance for resonance = around=20 502.5kHz. For most HF-sized wire antennas, this will be of the order of = 100s of=20 uH. The resulting coil is
------=_NextPart_000_0099_01C7D445.3CEAA0F0--