Envelope-to: dave@picks.force9.co.uk Delivery-date: Tue, 24 May 2005 04:21:09 +0100 Received: by pih-mxcore11.plus.net with spam-scanned (PlusNet MXCore v2.00) id 1DaPye-0004Bv-Un for dave@picks.force9.co.uk; Tue, 24 May 2005 04:21:09 +0100 Received: from post.thorcom.com ([193.82.116.20]) by pih-mxcore11.plus.net with esmtp (PlusNet MXCore v2.00) id 1DaPye-0004Bn-QR for dave@picks.force9.co.uk; Tue, 24 May 2005 04:21:08 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1DaPxf-0004Un-6u for rs_out_1@blacksheep.org; Tue, 24 May 2005 04:20:07 +0100 Received: from [193.82.116.30] (helo=relay.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1DaPxe-0004Ue-M9 for rsgb_lf_group@blacksheep.org; Tue, 24 May 2005 04:20:06 +0100 Received: from smtp-out1.hurontel.on.ca ([216.46.129.246]) by relay.thorcom.net with esmtp (Exim 4.43) id 1DaPxc-0004GX-Qt for rsgb_lf_group@blacksheep.org; Tue, 24 May 2005 04:20:06 +0100 Received: from mail.hurontel.on.ca (mail.hurontel.on.ca [216.46.129.11]) by smtp-out1.hurontel.on.ca (8.13.1/8.13.1) with ESMTP id j4O3Cxfv004777 for ; Mon, 23 May 2005 23:12:59 -0400 Received: from server (dial-17.hurontel.on.ca [216.46.128.17]) by mail.hurontel.on.ca (8.12.10+Sun/8.12.10) with SMTP id j4O3JRVj000275 for ; Mon, 23 May 2005 23:19:27 -0400 (EDT) Message-ID: <001701c56007$ad7216a0$98802ed8@server> From: "J. B. Weazle McCreath" To: rsgb_lf_group@blacksheep.org References: <000001c55fb4$cf915f50$e6a4c593@RD40002> Date: Tue, 24 May 2005 01:29:16 +0100 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2720.3000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2600.0000 X-SPF-Result: relay.thorcom.net: 216.46.129.246 is neither permitted nor denied by domain of hurontel.on.ca Subject: LF: Re: RE: Loop antenna problem 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

>Dear J.B., LF Group

>I think the problem here is the size of the coupling loop, which is only

>slightly smaller diameter than the main loop.

Hi Jim, LF Group,

My antenna is based on the successful design by Steve, VE7SL, with

only two differences, 1) my pickup loop is shielded, and 2) I used #12

wire rather than #20. Could those two differences make that much of

a change in the loop operation? I know that all other things being the

same, using the larger gauge wire would have raised the Q, but would

it change things so drastically that I'd have to use a smaller diameter

pickup loop?

Steve suggested that I use a simple non-shielded pickup as he used

on his antenna. I tried that, but I found little or no difference between

it and my shielded pickup. Both where spaced about 6 inches inside

the main loop, just as on his antenna, which works fine. That's what

is puzzling me, why does it work OK for him but not for me??!!

If I go the transformer route as you and several others have suggested,

do I need to physically remove the pickup loop or simply disconnect it?

I'm hoping the latter, as it'll be difficult to remove without lowering the

antenna! Thanks for your suggestions and hopefully I'll get the bugs

out of the way and be able to enjoy hearing things shortly.

73, J.B.