Return-Path: Received: from mtain-mk05.r1000.mx.aol.com (mtain-mk05.r1000.mx.aol.com [172.29.97.137]) by air-me03.mail.aol.com (v129.4) with ESMTP id MAILINME032-8ba94d35f62987; Tue, 18 Jan 2011 15:20:57 -0500 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-mk05.r1000.mx.aol.com (Internet Inbound) with ESMTP id A2D73380000DA; Tue, 18 Jan 2011 15:20:54 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1PfI2K-00056v-GW for rs_out_1@blacksheep.org; Tue, 18 Jan 2011 20:20:16 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1PfI2K-00056m-4g for rsgb_lf_group@blacksheep.org; Tue, 18 Jan 2011 20:20:16 +0000 Received: from smtp-vbr16.xs4all.nl ([194.109.24.36]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1PfI2I-00065K-Hw for rsgb_lf_group@blacksheep.org; Tue, 18 Jan 2011 20:20:16 +0000 Received: from pc-roelof (ndb.demon.nl [82.161.81.65]) by smtp-vbr16.xs4all.nl (8.13.8/8.13.8) with ESMTP id p0IKK8ap087216 for ; Tue, 18 Jan 2011 21:20:13 +0100 (CET) (envelope-from roelof@ndb.demon.nl) To: rsgb_lf_group@blacksheep.org References: <4D7062BE2D504CA4A55BDE1C7103CF31@gmc.net> <04DC6D14A81F4542B1D2189A5440F3D5@DennisPC> <4D334822.7020109@legal-medicine.de> <277DA8CD9ECE43D989BD77869417F642@DennisPC> <8DBC66D8CECB40DDB2E4630CDD4B20BA@PcMinto> <1b5870db06be1c7af1db527471cd482b@xs4all.nl> <10AF86B6FE9F41D8AC69768CCAEE994D@PcMinto> Date: Tue, 18 Jan 2011 21:20:06 +0100 MIME-Version: 1.0 From: "Roelof Bakker" Message-ID: In-Reply-To: <10AF86B6FE9F41D8AC69768CCAEE994D@PcMinto> User-Agent: Opera Mail/11.00 (Win32) X-Virus-Scanned: by XS4ALL Virus Scanner X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,none Content-Type: text/plain; charset=iso-8859-15; format=flowed; delsp=yes Subject: Re: LF: Re: Mini-Whip Antenna 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-global-disposition: G x-aol-sid: 3039ac1d61894d35f6264653 X-AOL-IP: 195.171.43.25 X-Mailer: Unknown (No Version) Hello Minto, In laboratory tests it is possible to tweak the bias of the J310 for a very high IP2 of +80 dBm and a IP3 of +33 dBm. However this does not hold in off air tests. I use the medium wave stations at Orford Ness, UK as off air signal generators. The station at 648 kHz is on 24/7, but the one at 1296 kHz only in part of the morning and between 16:00 and 17:00 UTC. I found IP3's ranging from about + 15dBm to + 20 dBm depending on supply voltage. Maybe you can use these stations as well for test purposes. At my location they produce each -20 dBm at the output of a mini-whip mounted 5 metre up. Except for the directive properties of a loop, both loops and whips can deliver stellar performance on reception. It depends on the local noise situation which type of antenna gives best results. 73, Roelof, pa0rdt