Envelope-to: dave@picks.force9.co.uk Delivery-date: Wed, 01 Mar 2006 04:14:24 +0000 Received: by pih-mxcore09.plus.net with spam-scanned (PlusNet MXCore v2.00) id 1FEIjI-0005Zc-3m for dave@picks.force9.co.uk; Wed, 01 Mar 2006 04:14:24 +0000 Received: from post.thorcom.com ([193.82.116.20]) by ptb-mxcore01.plus.net with esmtp (PlusNet MXCore v2.00) id 1FEIjH-0005ZR-Up for dave@picks.force9.co.uk; Wed, 01 Mar 2006 04:14:24 +0000 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1FEIiy-000215-Cj for rs_out_1@blacksheep.org; Wed, 01 Mar 2006 04:14:04 +0000 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1FEIix-00020w-RS for rsgb_lf_group@blacksheep.org; Wed, 01 Mar 2006 04:14:03 +0000 Received: from omc3-s5.bay6.hotmail.com ([65.54.249.79]) by relay1.thorcom.net with esmtp (Exim 4.51) id 1FEKCs-0004ej-Uc for rsgb_lf_group@blacksheep.org; Wed, 01 Mar 2006 05:49:20 +0000 Received: from hotmail.com ([65.54.172.122]) by omc3-s5.bay6.hotmail.com with Microsoft SMTPSVC(6.0.3790.211); Tue, 28 Feb 2006 20:13:41 -0800 Received: from mail pickup service by hotmail.com with Microsoft SMTPSVC; Tue, 28 Feb 2006 20:13:41 -0800 Message-ID: Received: from 71.37.244.7 by BAY5-DAV18.phx.gbl with DAV; Wed, 01 Mar 2006 04:13:37 +0000 X-Originating-IP: [71.37.244.7] X-Originating-Email: [we0h1@msn.com] X-Sender: we0h1@msn.com From: "MIKE REID" To: "rsgb_lf_group" References: <440516F4.5000600@hifidelity.com> Date: Tue, 28 Feb 2006 22:13:37 -0600 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: MSN 9 X-MimeOLE: Produced By MSN MimeOLE V9.10.0011.1703 Seal-Send-Time: Tue, 28 Feb 2006 22:13:37 -0600 X-OriginalArrivalTime: 01 Mar 2006 04:13:41.0311 (UTC) FILETIME=[85E43CF0:01C63CE6] Subject: Re: LF: Common Mode Noise on Feedline... Content-Type: text/html; charset=windows-1252 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-PN-SpamFiltered: by PlusNet MXCore (v2.00) Content-transfer-encoding: 8bit
Thank you Steve. Yes I have many of those FT240-77 cores here. I will wind one up tonight on the feedline. Easy fix huh?
 
Mike
 
----- Original Message -----
From: Steve Dove
To: we0h
Sent: Tuesday, February 28, 2006 9:37 PM
Subject: Re: LF: Common Mode Noise on Feedline...

Hi Mike,

Bingo.  Except you need a whole lot more than beads will win
you  -  ideally reactance up into the kohms.  10-20 turns of
coax around a big lump of 77 or 'J' material (I use the 2.4
inch toroids Jay was selling a few months ago, though 1.4"
work well, too).  This is the Whacking Great Common-Mode
Choke (W.G.C-M.C.) I mentioned the other night.  Should be
at the grounding point, on the coax going to the receiver,
*not* the antenna.

         Cheers,

                 Steve


MIKE REID wrote:
> Would adding ferrite beads on the feedline on a active whip antenna
> lessen the common mode noise issue? Where would the best place to add
> them if this is a good idea? I was thinking right at the point where the
> ground wire connection on the braid is.
> 
> Thank you,
> 
> Mike
> WE0H
> WD2XGI on the air 185.3026kc
> EN35hj