Return-Path: X-Spam-DCC: paranoid 1102; 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=1.7 required=5.0 tests=BAYES_00,DNS_FROM_AHBL_RHSBL, FORGED_MUA_OUTLOOK,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 u27LRLUo029383 for ; Mon, 7 Mar 2016 22:27:21 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1ad2cc-0007VO-Tw for rs_out_1@blacksheep.org; Mon, 07 Mar 2016 21:23:22 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1ad2cc-0007VF-AK for rsgb_lf_group@blacksheep.org; Mon, 07 Mar 2016 21:23:22 +0000 Received: from rgout0606.bt.lon5.cpcloud.co.uk ([65.20.0.133]) by relay1.thorcom.net with esmtp (Exim 4.86) (envelope-from ) id 1ad2ca-0002IK-3t for rsgb_lf_group@blacksheep.org; Mon, 07 Mar 2016 21:23:21 +0000 X-OWM-Source-IP: 81.129.182.138 (GB) X-OWM-Env-Sender: alan.melia@btinternet.com X-CTCH-RefID: str=0001.0A090203.56DDF147.0082,ss=1,re=0.000,recu=0.000,reip=0.000,cl=1,cld=1,fgs=0 X-Junkmail-Premium-Raw: score=38/50,refid=2.7.2:2016.2.29.171816:17:38.936,ip=81.129.182.138,rules=__HAS_MSGID, __SANE_MSGID, MSGID_32HEX_LC, INVALID_MSGID_NO_FQDN, __MSGID_32HEX, __HAS_FROM, __PHISH_FROM2, __FRAUD_WEBMAIL_FROM, __TO_MALFORMED_2, __TO_NO_NAME, __REFERENCES, __BOUNCE_CHALLENGE_SUBJ, __BOUNCE_NDR_SUBJ_EXEMPT, __SUBJ_ALPHA_END, __MIME_VERSION, __CT, __CT_TEXT_PLAIN, __CTE, __HAS_X_PRIORITY, __HAS_MSMAIL_PRI, __HAS_X_MAILER, USER_AGENT_OE, __OUTLOOK_MUA_1, __USER_AGENT_MS_GENERIC, __ANY_URI, __URI_NO_WWW, __FRAUD_MONEY_BIG_COIN_DIG, __SUBJ_ALPHA_NEGATE, __FORWARDED_MSG, BODY_SIZE_1100_1199, BODYTEXTP_SIZE_3000_LESS, __MIME_TEXT_ONLY, RDNS_GENERIC_POOLED, __URI_NS, SXL_IP_DYNAMIC[138.182.129.81.fur], HTML_00_01, HTML_00_10, __FRAUD_MONEY_BIG_COIN, BODY_SIZE_5000_LESS, RDNS_SUSP_GENERIC, __PHISH_FROM, __OUTLOOK_MUA, __PHISH_SPEAR_STRUCTURE_1, BODY_SIZE_2000_LESS, RDNS_SUSP, __FRAUD_WEBMAIL, FORGED_MUA_OUTLOOK, REFERENCES, BODY_SIZE_7000_LESS, NO_URI_HTTPS X-CTCH-Spam: Unknown Received: from gnat (81.129.182.138) by rgout06.bt.lon5.cpcloud.co.uk (8.6.122.06) (authenticated as alan.melia@btinternet.com) id 56CC2E350176E578 for rsgb_lf_group@blacksheep.org; Mon, 7 Mar 2016 21:23:31 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=btinternet.com; s=btcpcloud; t=1457385814; bh=wMLESH9sLFDJY+uJ7um96xYokz7gzpQOjh1440h+twU=; h=Message-ID:From:To:References:Subject:Date:MIME-Version:X-Mailer; b=CQu9NFhEcHTTreiPuI7koXnZbm+nDkMogHHCcRAB13ODjIMCsKLAb3gHb2tB42CWzubvl3Mu9ELhqrVVaiC+MsuAwqSBCKpAhAYhHOrLaFIJGzxo0hkYPMDYVYS621zgbrM/vAHCkmw2ZnpcSwb2mbF7ei4ohT945cRh99sSO5U= Message-ID: <6B35E910753344F3BDD887AFC50168D8@gnat> From: "Alan Melia" To: References: <56DDE61F.90508@abelian.org> Date: Mon, 7 Mar 2016 21:21:42 -0000 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.5931 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2900.6157 X-Scan-Signature: 739d4fb39bd02fc5a2de5437a39bb056 Subject: LF: Re: EbNaut from Todmorden Content-Type: text/plain; format=flowed; charset="iso-8859-1"; reply-type=response 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: 7246 Hi Paul, would your total wire length be in the range of 530m by any chance?? If so, I think the apparent length of the wire may be shorter due to the capacity to ground (it is not a free space quarterwave) If you measure the reactance (or capacitance) of just the wire a a frequency way below resonance you will a value that equates to about 6pF /m Alan G3NYK ----- Original Message ----- From: "Paul Nicholson" To: Sent: Monday, March 07, 2016 8:35 PM Subject: LF: EbNaut from Todmorden > > Today saw another 200m of wire added to the long wire antenna. > > Its impedance dips to a minimum of 70 ohms at about 170kHz > corresponding to a free-space quarter wavelength of 440m which > is somewhat less than my estimated total length of wire. > > 100uH in series brings it into tune at about 135kHz and presents > an impedance of 50 ohms and the tuning is quite broad, I don't > think I need a variable inductance. > > Can anyone advise a good frequency on which to test which > won't get in anyone's way? I expect to be using symbols > one second or longer. > > -- > Paul Nicholson > -- >