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 w6JElg7j008783 for ; Thu, 19 Jul 2018 16:47:44 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1fgA7X-0007QD-NP for rs_out_1@blacksheep.org; Thu, 19 Jul 2018 15:41:31 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1fgA7X-0007Q4-0q for rsgb_lf_group@blacksheep.org; Thu, 19 Jul 2018 15:41:31 +0100 Received: from emout03.email.it ([212.97.34.22]) by relay1.thorcom.net with esmtp (Exim 4.91_59-0488984) (envelope-from ) id 1fgA7V-0005uS-5k for rsgb_lf_group@blacksheep.org; Thu, 19 Jul 2018 15:41:29 +0100 Received: from emout03.email.it (localhost [127.0.0.1]) by emout03.email.it (Postfix) with ESMTP id 8C614961CD; Thu, 19 Jul 2018 16:41:23 +0200 (CEST) Received: from emout04.email.it (emout04.email.it [212.97.34.71]) by emout03.email.it (Postfix) with ESMTP id 7E6A39619B; Thu, 19 Jul 2018 16:41:23 +0200 (CEST) Received: from emout04.email.it (localhost [127.0.0.1]) by emout04.email.it (Postfix) with ESMTP id 29836961AD; Thu, 19 Jul 2018 16:41:23 +0200 (CEST) Received: from x220.localnet (unknown [5.170.46.199]) (using TLSv1 with cipher ECDHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by emout04.email.it (Postfix) with ESMTPSA id 04BEE961A4; Thu, 19 Jul 2018 16:41:22 +0200 (CEST) From: Claudio Pozzi To: rsgb_lf_group@blacksheep.org Date: Thu, 19 Jul 2018 16:41:14 +0200 Message-ID: <18459256.rv770VuFyb@x220> User-Agent: KMail/4.14.1 (Linux/3.16.0-4-amd64; KDE/4.14.2; x86_64; ; ) In-Reply-To: <35d7f239-cf2a-d5da-195c-c54b10c91f6c@n1bug.com> References: <5B4F3DC2.3090008@posteo.de> <35d7f239-cf2a-d5da-195c-c54b10c91f6c@n1bug.com> MIME-Version: 1.0 X-Spam-Score: 0.2 (/) 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: On Wednesday, July 18, 2018 05:34:51 PM you wrote: SNIP > > Perhaps so but now I do not understand how the coupling can be only > -21 dB. The efficiency of the TX antenna is < 0.1% and surely the > little RX antenna is very inefficient also. How can I have only 21 > dB loss of signal between them? What is the method of coupling or > signal transfer for antennas in such close proximity? > [...] Content analysis details: (0.2 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at http://www.dnswl.org/, no trust [212.97.34.22 listed in list.dnswl.org] 0.2 FREEMAIL_ENVFROM_END_DIGIT Envelope-from freemail username ends in digit (smtp01[at]email.it) 0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider (smtp01[at]email.it) -0.0 SPF_PASS SPF: sender matches SPF record -0.0 T_RP_MATCHES_RCVD Envelope sender domain matches handover relay domain X-Scan-Signature: 086f3faad0220c9ae57a7913e711a86d Subject: Re: LF: TX > RX isolation test Content-Transfer-Encoding: 7Bit Content-Type: text/plain; charset="us-ascii" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.9 required=5.0 tests=FROM_ENDS_IN_NUMS 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 On Wednesday, July 18, 2018 05:34:51 PM you wrote: SNIP > > Perhaps so but now I do not understand how the coupling can be only > -21 dB. The efficiency of the TX antenna is < 0.1% and surely the > little RX antenna is very inefficient also. How can I have only 21 > dB loss of signal between them? What is the method of coupling or > signal transfer for antennas in such close proximity? > Few meters from the transmitting antenna: at those frequencies the "reactive field" dominate, so the inverse square law is non applicable. 73 de Claudio, IK2PII -- ZE-Light e ZE-Pro: servizi zimbra per caselle con dominio email.it, per tutti i dettagli Clicca qui http://posta.email.it/caselle-di-posta-z-email-it.php?utm_campaign=email_Zimbra_102014=main_footer/f Sponsor: Idee regalo classiche o alternative? Trova l'offerta migliore in un click Clicca qui: http://adv.email.it/cgi-bin/foclick.cgi?mid=13327&d=19-7 -- ZE-Light e ZE-Pro: servizi zimbra per caselle con dominio email.it, per tutti i dettagli Clicca qui http://posta.email.it/caselle-di-posta-z-email-it.php?utm_campaign=email_Zimbra_102014=main_footer/f Sponsor: Idee regalo classiche o alternative? Trova l'offerta migliore in un click Clicca qui: http://adv.email.it/cgi-bin/foclick.cgi?mid=13327&d=19-7