Return-Path: X-Spam-DCC: paranoid 1290; Body=1 Fuz1=1 Fuz2=1 X-Spam-Checker-Version: SpamAssassin 3.1.3 (2006-06-01) on lipkowski.org X-Spam-Level: X-Spam-Status: No, score=-2.6 required=5.0 tests=BAYES_00 autolearn=unavailable version=3.1.3 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by paranoid.lipkowski.org (8.13.7/8.13.7) with ESMTP id sBN24a7B007809 for ; Tue, 23 Dec 2014 03:04:36 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Y3Eje-0002QC-3H for rs_out_1@blacksheep.org; Tue, 23 Dec 2014 01:58:06 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Y3Ejd-0002Q3-He for rsgb_lf_group@blacksheep.org; Tue, 23 Dec 2014 01:58:05 +0000 Received: from mail-la0-f44.google.com ([209.85.215.44]) by relay1.thorcom.net with esmtps (TLSv1:DHE-RSA-AES256-SHA:256) (Exim 4.84) (envelope-from ) id 1Y3Ejb-0001Nl-Vw for rsgb_lf_group@blacksheep.org; Tue, 23 Dec 2014 01:58:04 +0000 Received: by mail-la0-f44.google.com with SMTP id gd6so4878770lab.31 for ; Mon, 22 Dec 2014 17:58:02 -0800 (PST) X-DKIM-Result: Domain=gmail.com Result=Good and Known Domain DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type; bh=cVr4jGw8AhZCGnsrmWhO1oqYh+ZJu7DP8FVitSMLigg=; b=Mwfx65XReSYitmVvgmyBF7H1a2BmdiBaXquUPYMqNuBC7lwwhC+Au3vR2jdwPowN1R pZs4LMBzuzkBUoDU8HVsx1KfqtDLLXtXSil5md1+iXck78xfkvFtngOwMJriOjXmLWSq /dIhqqCdmjOPZZbpKue3GBtpdhqpBWr9bvioKzeSH5eL3HY5osjqc+Euqz2ONR+00lDR Zuo/0nrYl/tyC6XKkH9TDyjty1eVCQ9zkRLjmpR+VD2UlKMGUwApFLT0YJdi7BBI47LS k7QFK8nfSmFfr+KhaD1yYn8CK9HsQDAm1Xc8564bI2l3lJAu/gv3dW6yh4GfjfoQI6Mk WDNQ== MIME-Version: 1.0 X-Received: by 10.112.198.233 with SMTP id jf9mr25367011lbc.9.1419299882614; Mon, 22 Dec 2014 17:58:02 -0800 (PST) Received: by 10.25.149.147 with HTTP; Mon, 22 Dec 2014 17:58:02 -0800 (PST) In-Reply-To: <003001d01e44$a16ae110$e440a330$@nifty.com> References: <00b601d01d18$87884620$9698d260$@nifty.com> <003001d01e44$a16ae110$e440a330$@nifty.com> Date: Tue, 23 Dec 2014 12:58:02 +1100 Message-ID: From: Dimitrios Tsifakis To: rsgb_lf_group@blacksheep.org X-Scan-Signature: 1f795a2ee1ecd56682b47ad11969b3d3 Subject: Re: LF: RE: Japan on 475 kHz. Content-Type: text/plain; charset=UTF-8 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-Scanned-By: MIMEDefang 2.56 on 10.1.3.10 Status: O X-Status: X-Keywords: X-UID: 1583 Hi Hideho san, >> I use a low pass filter which ensures that the harmonics are -50 dBc or >> lower. I think the tuned antenna also helps with not radiating too much > My quick calculation resulted in -120dBc necessary, to reduce QRM to adjacent houses, > (I may be wrong)., and I am thinking how to make it. In Australia, for frequencies below 30 MHz we need to reduce our harmonics by the lesser of: 1) 43 db + 10*log(PEP) 2) 50 dB where PEP is peak power to the antenna. When I was allocated an experimental license for 500 kHz, I was asked to demonstrate that my harmonics are reduced by 60 dB (from memory). 73, Dimitris Vk1SV