Return-Path: Received: from rly-dd05.mx.aol.com (rly-dd05.mail.aol.com [172.19.141.152]) by air-dd04.mail.aol.com (v126.13) with ESMTP id MAILINDD044-b7d4b2d060733b; Sat, 19 Dec 2009 11:57:55 -0500 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by rly-dd05.mx.aol.com (v125.7) with ESMTP id MAILRELAYINDD057-b7d4b2d060733b; Sat, 19 Dec 2009 11:57:44 -0500 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1NM2XP-0002EQ-2R for rs_out_1@blacksheep.org; Sat, 19 Dec 2009 16:52:15 +0000 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1NM2XO-0002EH-Jw for rsgb_lf_group@blacksheep.org; Sat, 19 Dec 2009 16:52:14 +0000 Received: from out1.ip07ir2.opaltelecom.net ([62.24.128.243]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1NM2ah-00038D-Tm for rsgb_lf_group@blacksheep.org; Sat, 19 Dec 2009 16:55:42 +0000 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: As4FAG+ULEtOlrSE/2dsb2JhbACIXspGhC4E X-IronPort-AV: E=Sophos;i="4.47,424,1257120000"; d="scan'208";a="363643695" Received: from unknown (HELO your91hoehfy9g) ([78.150.180.132]) by out1.ip07ir2.opaltelecom.net with SMTP; 19 Dec 2009 16:56:16 +0000 Message-ID: <002501ca80cc$2df97f90$0301a8c0@your91hoehfy9g> From: "mal hamilton" To: References: <38A51B74B884D74083D7950AD0DD85E828ACB3@File-Server-HST.hst.e-technik.tu-darmstadt.de> <346854e9698cbf94f4483c66682bb63b.squirrel@webmail.xs4all.nl> <001e01ca80b0$392cb0b0$8d01a8c0@JAYDELL> Date: Sat, 19 Dec 2009 16:56:16 -0000 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1106 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 X-Karma: unknown: X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,none Subject: LF: Re: Re: Noise cancelling by using optic transmission of RX signals Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.0 required=5.0 tests=none 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-AOL-IP: 193.82.116.20 I said recently that the wire connecting these type of mini antennas is in fact the antenna. It was the same with the Partridge Joy stick of yesteryears, the long connecting wire to the small loading coil was doing most of the work. There is no substitute for a real resonant antenna at the working frequency. G3KEV ----- Original Message ----- From: To: Sent: Saturday, December 19, 2009 1:36 PM Subject: LF: Re: Noise cancelling by using optic transmission of RX signals > >I think the role of the ground with active whips is often neglected - the output of the whip preamp > >is the voltage differential between the whip element and the circuit ground, so the ground > >connection is just as much part of the antenna as the whip element itself is. > > That's an important point that is often overlooked or ignored. A mini whip mounted up at 5 meters is > a 5 meter antenna. You can easily prove this by mounting it at ground zero on top of a ground > screen. Been there, done that. > > Jay W1VD WD2XNS WE2XGR > >