X-GM-THRID: 1234240091223702189 X-Gmail-Labels: rsgb lf Delivered-To: daveyxm@gmail.com Received: by 10.35.22.8 with SMTP id z8cs148544pyi; Fri, 20 Apr 2007 02:57:56 -0700 (PDT) Received: by 10.67.22.14 with SMTP id z14mr2747449ugi.1177063075867; Fri, 20 Apr 2007 02:57:55 -0700 (PDT) Return-Path: Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mx.google.com with ESMTP id s1si4151747uge.2007.04.20.02.57.52; Fri, 20 Apr 2007 02:57:55 -0700 (PDT) Received-SPF: neutral (google.com: 193.82.116.20 is neither permitted nor denied by best guess record for domain of owner-rsgb_lf_group@blacksheep.org) DomainKey-Status: bad (test mode) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Hepmi-0003vG-HN for rs_out_1@blacksheep.org; Fri, 20 Apr 2007 10:52:08 +0100 Received: from [83.244.159.144] (helo=relay3.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Hepmh-0003v7-Tl for rsgb_lf_group@blacksheep.org; Fri, 20 Apr 2007 10:52:08 +0100 Received: from an-out-0708.google.com ([209.85.132.247]) by relay3.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1Hepme-0002lC-69 for rsgb_lf_group@blacksheep.org; Fri, 20 Apr 2007 10:52:07 +0100 Received: by an-out-0708.google.com with SMTP id c14so891561anc for ; Fri, 20 Apr 2007 02:51:56 -0700 (PDT) DKIM-Signature: a=rsa-sha1; c=relaxed/relaxed; d=googlemail.com; s=beta; h=domainkey-signature:received:received:message-id:date:from:to:subject:mime-version:content-type; b=qojsm0J8bDnNHQBU6WwiC4iTABpCxtCmoosKDa+H1KWJuihF2QN0EjZRs4i6HFLdpmY+VkjglzDeLgd4TS5GS1KZZC+IkZCBkpBqLq7kd7x5ozBrUIRcvXtlLup7s9Tg9sB08TLfpoMSGY/kyGAz7yRetV7WuJ1lER8lh7m4BXY= DomainKey-Signature: a=rsa-sha1; c=nofws; d=googlemail.com; s=beta; h=received:message-id:date:from:to:subject:mime-version:content-type; b=JtJ01lfCqo9Cu1tC7018HlEEPUEuApVyjl71RJ9nedFTIuVdorHdiuNwlb5c3fQR1yIU4kaTatwVm/v8+z51wXEe99TM3Ha6/zMxC1MobTgQYsgsO4PaN4Uj1xb64snfqHFXvIoK74bTHv9iqINXS9tJZnrDG1n6cPe+uVe8tbs= Received: by 10.100.37.4 with SMTP id k4mr1581605ank.1177062715983; Fri, 20 Apr 2007 02:51:55 -0700 (PDT) Received: by 10.100.112.17 with HTTP; Fri, 20 Apr 2007 02:51:50 -0700 (PDT) Message-ID: <88d2415e0704200251j1c6341cfpe8fface264f42624@mail.gmail.com> Date: Fri, 20 Apr 2007 10:51:50 +0100 From: "lawrence mayhead" To: rsgb MIME-Version: 1.0 DomainKey-Status: good (testing) X-Spam-Score: 0.9 (/) X-Spam-Report: autolearn=disabled,HTML_10_20=0.945,HTML_MESSAGE=0.001 Subject: LF: Sensitivity on 500kHz Content-Type: multipart/alternative; boundary="----=_Part_105847_16193513.1177062710923" 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=HTML_MESSAGE 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 Status: O X-Status: X-Keywords: X-UID: 2066 ------=_Part_105847_16193513.1177062710923 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Content-Disposition: inline Hi All, I have this problem on my IC781, gain reduces by about 20 db at 500kHz. This does'nt matter when I am using the big transmit antenna, signals easilly overcome rx noise. My loops are 20/30db down on the vert, but they still overide the internal noise, I don't know wether more headroom would be an advantage, but at the moment the only disadvantage is that I can't use the "S " meter for reports. Seems like all manufacturers are attenuating above 500, presumably to prevent big BC signals from overloading the front end. 73 Laurie. ------=_Part_105847_16193513.1177062710923 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Content-Disposition: inline Hi All,
I have this problem on my IC781, gain reduces by about 20 db at 500kHz.
This does'nt matter when I am using the big transmit antenna, signals easilly
overcome rx noise. My loops are 20/30db down on  the vert, but  they still overide
the internal noise, I don't know wether more headroom would be an advantage, but
at the moment the only disadvantage is that I can't use the "S " meter for reports.
Seems like all manufacturers are attenuating above 500, presumably to prevent big
BC signals from overloading the front end.
73 Laurie.
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