Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by klubnl.pl (8.14.4/8.14.4/Debian-8+deb8u2) with ESMTP id w6ID8LIM013635 for ; Wed, 18 Jul 2018 15:08:24 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1fflz0-0003vD-Ef for rs_out_1@blacksheep.org; Wed, 18 Jul 2018 13:55:06 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1fflyz-0003v4-KC for rsgb_lf_group@blacksheep.org; Wed, 18 Jul 2018 13:55:05 +0100 Received: from lb1-smtp-cloud9.xs4all.net ([194.109.24.22]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.91_59-0488984) (envelope-from ) id 1fflyy-00036d-7B for rsgb_lf_group@blacksheep.org; Wed, 18 Jul 2018 13:55:04 +0100 Received: from [192.168.178.20] ([83.162.220.82]) by smtp-cloud9.xs4all.net with ESMTP id flysfzrLzEJtcflytfzcZu; Wed, 18 Jul 2018 14:55:02 +0200 From: "Roelof Bakker" To: rsgb_lf_group@blacksheep.org Date: Wed, 18 Jul 2018 14:54:58 +0200 MIME-Version: 1.0 Message-ID: <5B4F38A2.18718.1564130@roelof.ndb.demon.nl> In-reply-to: References: , <5B4DE197.1000303@posteo.de>, X-mailer: Pegasus Mail for Windows (4.72.572) Content-description: Mail message body X-CMAE-Envelope: MS4wfIYXYfp4WLSeokP9w7zDmzm+HlFLh83VbOSjv2MogsrZGoRRtGrn1CBh9EqHabLpDoUhxEP8k0DQp5OOIUxwS0nmILN8VaHk2N+TCEymW5EnSSnzygYS zkuM2XRflGJYVmCTbyRHL1qQp+D19emocqEI87T3nI4lBvp8tp1AJB7ogum9KlRC+RU46kBmp8kDNQ== X-Spam-Score: -0.7 (/) X-Spam-Report: Spam detection software, running on the system "relay1.thorcom.net", has NOT identified this incoming email as spam. The original message has been attached to this so you can view it or label similar future email. If you have any questions, see @@CONTACT_ADDRESS@@ for details. Content preview: Hello Paul, For your information, today I have tested a Žlow noise verticalŽ. This is a 50 mm diameter and 3.30 meter long aluminium pole. The capacitance is 47 pf. Using a transformer of 80 turns primary and 8 turns secondary on a high mu toroid the output as measured with a PERSEUS SDR on the carrier of a local NDB on 399.5 kHz is -97 dBm. The output on my standard mini-whip mounted 4 meter high is -81 dBm. The output is low, but not completely useless, depending on the amount of local noise it picks up. At my location the signal to noise ratio is 10 dB worse as on my mini-whip antenna. [...] Content analysis details: (-0.7 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.7 RCVD_IN_DNSWL_LOW RBL: Sender listed at http://www.dnswl.org/, low trust [194.109.24.22 listed in list.dnswl.org] -0.0 RCVD_IN_MSPIKE_H3 RBL: Good reputation (+3) [194.109.24.22 listed in wl.mailspike.net] -0.0 RCVD_IN_MSPIKE_WL Mailspike good senders X-Scan-Signature: f62c7cf8eeb8e5a327b71719e9bffff1 Subject: Re: LF: TX > RX isolation test Content-type: text/plain; charset=ISO-8859-1 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=none 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 Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from Quoted-printable to 8bit by klubnl.pl id w6ID8LIM013635 Hello Paul, For your information, today I have tested a Žlow noise verticalŽ. This is a 50 mm diameter and 3.30 meter long aluminium pole. The capacitance is 47 pf. Using a transformer of 80 turns primary and 8 turns secondary on a high mu toroid the output as measured with a PERSEUS SDR on the carrier of a local NDB on 399.5 kHz is -97 dBm. The output on my standard mini-whip mounted 4 meter high is -81 dBm. The output is low, but not completely useless, depending on the amount of local noise it picks up. At my location the signal to noise ratio is 10 dB worse as on my mini-whip antenna. The K9AY is an excellent antenna and if you have the space, I should go for it. I do prefer an omnidirectional antenna as at LF you never know the exact path of arrival. I am not only interested in receiving amateur radio signals but also hunt NDB's, NAVTEX and DGPS stations. NDB's and DGPS stations from Canada are received here every day, Summer included. 73, Roelof, pa0rdt