Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on lipkowski.org X-Spam-Level: X-Spam-Status: No, score=-2.3 required=5.0 tests=FREEMAIL_FORGED_FROMDOMAIN, FREEMAIL_FROM,HEADER_FROM_DIFFERENT_DOMAINS,RCVD_IN_DNSWL_MED,SPF_PASS, T_DKIM_INVALID autolearn=ham autolearn_force=no version=3.4.0 X-Spam-DCC: EATSERVER: mailn 1166; Body=2 Fuz1=2 Fuz2=2 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by lipkowski.org (8.14.4/8.14.4/Debian-8+deb8u1) with ESMTP id v5NFZ2NJ023890 for ; Fri, 23 Jun 2017 17:35:03 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1dOQXW-0002zi-Ai for rs_out_1@blacksheep.org; Fri, 23 Jun 2017 16:30:30 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1dOQXV-0002zZ-H8 for rsgb_lf_group@blacksheep.org; Fri, 23 Jun 2017 16:30:29 +0100 Received: from mail-wr0-x232.google.com ([2a00:1450:400c:c0c::232]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.89) (envelope-from ) id 1dOQXS-0007fb-Py for rsgb_lf_group@blacksheep.org; Fri, 23 Jun 2017 16:30:28 +0100 Received: by mail-wr0-x232.google.com with SMTP id c11so70419488wrc.3 for ; Fri, 23 Jun 2017 08:30:26 -0700 (PDT) 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=20161025; h=date:from:message-id:to:subject:in-reply-to:references:mime-version :content-transfer-encoding; bh=MaX9NOuSOvSlf55aLUuFUWMWy+L87oZnY0CZTgGU6C8=; b=XOm1bSch3MIfoy3DwDIbYtEdKEGoSXpRPuKmDpFuS9qD2Oku9vRUvphAtlJSqVTFCS +I0ZPGH1O5oWwupeNd46tM58Ph9/kFMyDFnFhcBhcFR9FsxkCBiiCYWhSYynES+St3js enGiVYQELnLPpGk5Uj2BQ/H/FhtTpAAaupYEsB/XjgQOFjiEtq6dOShvo8mDqhG8Hcli 0GD6NIiqg/fDGFnMhZJRxkJXKdNVRyy3Y/UMFp84yQQAKXU0mIFP6x7uXU2ihSd6UpEM VXH7+4liMvlsingmbMpS06g8E+PXy3Gs7DYdfzQEKokorKhpc/XE8Szcb/pg4u3oKR+q hlNA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:message-id:to:subject:in-reply-to :references:mime-version:content-transfer-encoding; bh=MaX9NOuSOvSlf55aLUuFUWMWy+L87oZnY0CZTgGU6C8=; b=lgVkcZhzAzKf/5jOwSAyTRNm61CyOLtI9wX3H+D2FBatG/plLLAWCAcNUK386rRGQi R0qQQQ6gdSkE7fsbJvihj5SWnlO+R01vTn35xSGp5zx+yMgddFmx79MQhqUW5ibAz07a hoimCrTIcqkLdqWn0jAg6WUOFPwVpPZUr93h1x7wR8X4I+We57pGixBMYhBZejAQJPEh StynBNuuH0UXVcqObqGR+wjdS/bXhMdN+BdSkiDch6ecr/E/937oDWKLxZmuy31WSjTp JzF+als1UdPMnY76IqtvGQdl6ZyNpg391BlxGkaT9H2vEiEHlSwIQzxLT7lmATWvzC/f tQuw== X-Gm-Message-State: AKS2vOw8Behrcowgd9O7DkWSVDAe3/XWjlSJn88u2dj+OR4VwiuRdwPU JaHU+rCFFv5l+r0n X-Received: by 10.28.140.212 with SMTP id o203mr1223442wmd.66.1498231825633; Fri, 23 Jun 2017 08:30:25 -0700 (PDT) Received: from OfficeWin7.lan (82-70-254-222.dsl.in-addr.zen.co.uk. [82.70.254.222]) by smtp.gmail.com with ESMTPSA id n64sm4915187wmd.24.2017.06.23.08.30.24 for (version=TLS1 cipher=AES128-SHA bits=128/128); Fri, 23 Jun 2017 08:30:25 -0700 (PDT) Date: Fri, 23 Jun 2017 16:30:24 +0100 From: Chris Wilson X-Priority: 3 (Normal) Message-ID: <14510545810.20170623163024@gmail.com> To: Andy Talbot In-Reply-To: References: <1023005061.20170623151045@gmail.com> <80eaeab6-2470-ded8-e617-65846877c1c4@charter.net> MIME-Version: 1.0 X-Scan-Signature: 5c335215f1b3de26d890ee84d49616ce Subject: Re: LF: Take care lads, grass fire here... 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 2.75 Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from quoted-printable to 8bit by lipkowski.org id v5NFZ2NJ023890 Status: O X-Status: X-Keywords: X-UID: 12065 Hello Andy, Well, I have seen the evidence you know all about LF fires ;) Thanks for the tip, will use an insulator each end, cheers. Friday, June 23, 2017, 3:58:25 PM, you wrote: > Never use nylon as an RF insulator,  it's horribly lossy.  Back in > the 73kHz days I used nylon strimmer cord  as an insulator for my > Tee antenna; 200Watts and about 15kV on the antenna.  One day , in > wet weather, after a prolonged transmission Pout suddenly dropped > and I saw the antenna had fallen down.   The nylon had just melted.  > Presumably a combination of lossy material and damp helping tracking. > Replaced with a decent ceramic dog-bone at each end and its been fine ever since - nearly 20 years > Andy  G4JNT -- Best regards, Chris mailto:dead.fets@gmail.com