Return-Path: Received: (qmail 6653 invoked from network); 28 Feb 2000 15:24:46 -0000 Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by redlabel.core.plus.net.uk with SMTP; 28 Feb 2000 15:24:46 -0000 Received: from majordom by post.thorcom.com with local (Exim 3.02 #1) id 12PRuz-0006DP-00 for rsgb_lf_group-outgoing@blacksheep.org; Mon, 28 Feb 2000 15:17:05 +0000 Content-Transfer-Encoding: 8bit Received: from mail.cc.kuleuven.ac.be ([134.58.10.6]) by post.thorcom.com with esmtp (Exim 3.02 #1) id 12PRuy-0006DK-00 for rsgb_lf_group@blacksheep.org; Mon, 28 Feb 2000 15:17:04 +0000 Received: from LCBD15.fys.kuleuven.ac.be (LCBD15.fys.kuleuven.ac.be [134.58.80.15]) by mail.cc.kuleuven.ac.be (8.9.3/8.9.0) with SMTP id QAA27252 for ; Mon, 28 Feb 2000 16:16:55 +0100 X-Priority: 3 X-MSMail-Priority: Normal Message-ID: <3.0.1.16.20000228171416.2217bc50@mail.cc.kuleuven.ac.be> X-Sender: pb623250@mail.cc.kuleuven.ac.be X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 X-Mailer: Windows Eudora Pro Version 3.0.1 (16) Date: Mon, 28 Feb 2000 17:14:16 To: rsgb_lf_group@blacksheep.org From: "Rik Strobbe" Subject: Re: LF: Re: Low loss inductors In-reply-to: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group Sender: The inductance of a coax 'stub' is frequency dependent ! According to the formula for a loss-less cable (given in an earlier mail, should be OK for 136kHz) 70m of RG58 cable should be about 17uH. For higher frequency this value will increase, until it reaches 'endless' for a quarter-wave stub (at +/- 700kHz). Based on a value for 37uH the frequency used to measure should be arround 550kHz. 73, Rik ON7YD At 09:34 28/02/00 EST, you wrote: >In a message dated 2/27/00 9:10:10 GMT Daylight Time, vernall@xtra.co.nz >writes: > ><< Does any reader have a drum of coaxial cable and a low frequency bridge > test set? A practical measurement should sort out a quantitative > result. >> > >Not a test set for measuring at 136k. But abt 70m of RG58 on drum measures: > >With short at far end - 37.16uH >With open cct at far end 6.265nF. > >