Return-Path: Received: (qmail 59204 invoked from network); 25 Aug 2004 17:05:59 -0000 Received: from unknown (HELO ptb-spamcore01.plus.net) (192.168.71.1) by ptb-mailstore01.plus.net with SMTP; 25 Aug 2004 17:05:59 -0000 Received: from mailnull by ptb-spamcore01.plus.net with spamcore-l-b (Exim 4.32; FreeBSD) id 1C01J3-000LsX-3B for dave@picks.force9.co.uk; Wed, 25 Aug 2004 18:11:29 +0100 Received: from [192.168.67.2] (helo=ptb-mxcore02.plus.net) by ptb-spamcore01.plus.net with esmtp (Exim 4.32; FreeBSD) id 1C01J3-000LsU-0M for dave@picks.force9.co.uk; Wed, 25 Aug 2004 18:11:29 +0100 Received: from post.thorcom.com ([193.82.116.20]) by ptb-mxcore02.plus.net with esmtp (Exim) id 1C01Dj-0001Yl-1T for dave@picks.force9.co.uk; Wed, 25 Aug 2004 17:05:59 +0000 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1C01DM-0004T9-Jd for rs_out_1@blacksheep.org; Wed, 25 Aug 2004 18:05:36 +0100 Received: from [193.82.116.30] (helo=relay.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1C01DM-0004T0-5h for rsgb_lf_group@blacksheep.org; Wed, 25 Aug 2004 18:05:36 +0100 Received: from virus-out.ttyl.com ([193.212.240.200] helo=scan.telenor.net) by relay.thorcom.net with esmtp (Exim 4.41) id 1C01DI-0008J6-Vo for rsgb_lf_group@blacksheep.org; Wed, 25 Aug 2004 18:05:36 +0100 Received: from tns-fbu-22-209.corp.telenor.no ([134.47.162.190] [134.47.162.190]) by scan.telenor.net with ESMTP for rsgb_lf_group@blacksheep.org; Wed, 25 Aug 2004 18:49:59 +0200 Received: from tns-fbu-22-213.corp.telenor.no ([134.47.162.191]) by tns-fbu-22-209.corp.telenor.no with Microsoft SMTPSVC(5.0.2195.6713); Wed, 25 Aug 2004 18:49:58 +0200 Received: from TNS-FBU-2E-006.corp.telenor.no ([134.47.162.186]) by tns-fbu-22-213.corp.telenor.no with Microsoft SMTPSVC(5.0.2195.6713); Wed, 25 Aug 2004 18:49:58 +0200 content-class: urn:content-classes:message X-MimeOLE: Produced By Microsoft Exchange V6.0.6487.1 Date: Wed, 25 Aug 2004 18:49:58 +0200 Message-Id: Thread-Topic: =?iso-8859-1?Q?Re=3A_Re=3A_Re=B2=3A_Tune_the_loop=2E=2E=2E?= Thread-Index: AcSBMtRKuBwps1rGQEyYPACKt6WtswJkBS5A From: jan-martin.noding@telenor.com To: rsgb_lf_group@blacksheep.org X-OriginalArrivalTime: 25 Aug 2004 16:49:58.0899 (UTC) FILETIME=[8E9AEC30:01C48AC3] MIME-Version: 1.0 X-SPF-Result: relay.thorcom.net: 193.212.240.200 is neither permitted nor denied by domain of telenor.com X-Spam-Score: 0.9 (/) X-Spam-Report: autolearn=no,HTML_40_50=0.474,HTML_FONT_BIG=0.1,HTML_MESSAGE=0.001,NO_REAL_NAME=0.285 Subject: LF: =?iso-8859-1?Q?RE=3A_Re=3A_Re=3A_Re=B2=3A_Tune_the_loop_with_varicap_?= =?iso-8859-1?Q?or_tuning_condenser?= Content-Type: text/html; charset=windows-1252 X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Status: No, hits=0.9 required=5.0 tests=HTML_40_50,HTML_FONT_BIG, HTML_MESSAGE,NO_REAL_NAME 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 X-Spam-Filtered: by PlusNet SpamCORE (v3.00) Content-transfer-encoding: 8bit

I got to the conclusion that the coupling loops should have an area of 1/100's the tuned loop.
Note that some suggest using tuning capacitor for the loop. My loop tuning is so sharp - it is 25dB variation from 136-138.8kHz, so the only way out is to use varicap tuning

73 Jan-Martin

---
J M Noeding, LA8AK QRL: 9077-7126 (QTH: 0047-380-87178)

-----Original Message-----
From: owner-rsgb_lf_group@blacksheep.org [mailto:owner-rsgb_lf_group@blacksheep.org]On Behalf Of F6CWN
Sent: 13. august 2004 14:32
To: rsgb_lf_group@blacksheep.org
Subject: LF: Re: Re: Re²: Tune the loop...

13./08/2004 1211z

Hi Bryan,

I also used a loop with a second loop inside, then i receive very well a submarine transmitter very close...

The mutual coupling between the low Z pick up loop and the "RX" loop elarge the BW...They are no miracle!

Maybe the loop # 142857 will be perfect, wait and see! :-))

Jeff / F6CWN

----- Original Message -----

From: captbrian

To: rsgb_lf_group@blacksheep.org

Sent: Friday, August 13, 2004 11:05 AM

Subject: LF: Re: Re²: Tune the loop...

Merci,

I wonder why you don't use the commonplace (for higher frequencies ) small loop inside the bigger one for impedance transformation and variable coupling?. Notice I am learning from others' mistakes before making my own loop :-))

Bryan G3GVB