Return-Path: X-Spam-DCC: paranoid 1233; Body=2 Fuz1=2 Fuz2=2 X-Spam-Checker-Version: SpamAssassin 3.1.3 (2006-06-01) on lipkowski.org X-Spam-Level: X-Spam-Status: No, score=-0.5 required=5.0 tests=BAYES_00,DNS_FROM_AHBL_RHSBL, FORGED_RCVD_HELO,RATWARE_GECKO_BUILD,SPF_PASS autolearn=no 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 u3BLCJjP007540 for ; Mon, 11 Apr 2016 23:12:19 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1apj3B-0004lO-5C for rs_out_1@blacksheep.org; Mon, 11 Apr 2016 22:07:13 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1apj3A-0004lF-Fv for rsgb_lf_group@blacksheep.org; Mon, 11 Apr 2016 22:07:12 +0100 Received: from parrot.netcom.co.uk ([217.72.171.49]) by relay1.thorcom.net with esmtp (Exim 4.87) (envelope-from ) id 1apj38-0008VG-4w for rsgb_lf_group@blacksheep.org; Mon, 11 Apr 2016 22:07:11 +0100 Received: from pn.abelian.org (i-194-106-52-83.freedom2surf.net [194.106.52.83]) by parrot.netcom.co.uk (Postfix) with ESMTP id C91493273E4 for ; Mon, 11 Apr 2016 22:06:22 +0100 (BST) Received: from [127.0.0.1] (localhost [127.0.0.1]) by pn.abelian.org (Postfix) with ESMTP id F2DC9400472 for ; Mon, 11 Apr 2016 21:07:08 +0000 (UTC) To: rsgb_lf_group@blacksheep.org References: <570A7631.5050001@lineone.net> <570B6F37.8060402@lineone.net> <2025D63622D3474489049C563BA6B7AB@gnat> <570BD148.6020103@lineone.net> From: Paul Nicholson Message-ID: <570C11FC.6090205@abelian.org> Date: Mon, 11 Apr 2016 21:07:08 +0000 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.6.0 MIME-Version: 1.0 In-Reply-To: X-Scan-Signature: bb61bee384896e075004ae5ec954ddd2 Subject: Re: LF: Re: Screening an LF Loading Coil Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit 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 10.1.3.11 Status: O X-Status: X-Keywords: X-UID: 7663 Takes me back to the 1970's when I was a student working for Gerald David at Aerial Facilities in Chesham building these things - http://www.ingenia.org.uk/Ingenia/Articles/240 which worked incredibly well thanks to the ingenuity of some people at Bradford Uni who designed the adjustable center conductor of the cavity so that the overall temperature coefficient of the 'barrel' as we called the cavities, was close to zero. Bandwidths of a few kHz at VHF with insertion loss of less than 1dB were normal. Gerald was a wonderful larger than life character, I could relate many stories about life at AFL in those days - not least Gerald's specialised driving techniques applied to the country lanes of Buckinghamshire. There were many jokes about ensuring the barrels were empty and Friday lunchtimes at the pub were generally devoted to that. -- Paul Nicholson --