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 wB59XipX002436 for ; Wed, 5 Dec 2018 10:33:46 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1gUTN2-0000Vf-Pg for rs_out_1@blacksheep.org; Wed, 05 Dec 2018 09:21:28 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1gUTLm-0000VI-Hn for rsgb_lf_group@blacksheep.org; Wed, 05 Dec 2018 09:20:10 +0000 Received: from emout02.email.it ([212.97.34.18]) by relay1.thorcom.net with esmtp (Exim 4.91_59-0488984) (envelope-from ) id 1gUTLj-000840-0f for rsgb_lf_group@blacksheep.org; Wed, 05 Dec 2018 09:20:09 +0000 Received: from emout02.email.it (localhost [127.0.0.1]) by emout02.email.it (Postfix) with ESMTP id A8E658218D for ; Wed, 5 Dec 2018 10:19:25 +0100 (CET) Received: from x220.localnet (62-11-164-198.dialup.tiscali.it [62.11.164.198]) (using TLSv1 with cipher ECDHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by emout02.email.it (Postfix) with ESMTPSA id 0AFB78218A for ; Wed, 5 Dec 2018 10:19:02 +0100 (CET) From: Claudio Pozzi To: rsgb_lf_group@blacksheep.org Date: Wed, 05 Dec 2018 10:18:52 +0100 Message-ID: <1750236.WyIAmIBGs7@x220> User-Agent: KMail/4.14.1 (Linux/3.16.0-4-amd64; KDE/4.14.2; x86_64; ; ) In-Reply-To: <6ec6bc17-3d4e-6909-77f6-ae7961cec51d@n1bug.com> References: <0d2ac752-44f5-e503-e2a0-a8b4c841bcee@n1bug.com> <5C052984.8030902@posteo.de> <6ec6bc17-3d4e-6909-77f6-ae7961cec51d@n1bug.com> MIME-Version: 1.0 X-Spam-Score: -0.4 (/) 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 Monday, December 03, 2018 10:56:59 AM you wrote: SNIP > Of course I do need to measure *antenna* current to be sure it is > increasing as I expect. Content analysis details: (-0.4 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.7 RCVD_IN_DNSWL_LOW RBL: Sender listed at http://www.dnswl.org/, low trust [212.97.34.18 listed in list.dnswl.org] -0.0 SPF_PASS SPF: sender matches SPF record 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 HTML_MESSAGE BODY: HTML included in message X-Scan-Signature: ad8e5dd63f7497fd9d71d15044db2e2b Subject: Re: LF: More on unstable antenna R Content-Type: multipart/alternative; boundary="nextPart3178607.GzEot1m0KS" Content-Transfer-Encoding: 7Bit X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=1.0 required=5.0 tests=FROM_ENDS_IN_NUMS,HTML_60_70, HTML_MESSAGE 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 This is a multi-part message in MIME format. --nextPart3178607.GzEot1m0KS Content-Transfer-Encoding: 7Bit Content-Type: text/plain; charset="us-ascii" On Monday, December 03, 2018 10:56:59 AM you wrote: SNIP > Of course I do need to measure *antenna* current to be sure it is > increasing as I expect. My few cents... 1- check if the antenna coil and transmitter ground share the same earth/ground connection. 2- build the simplest RF current meter (http://mirror.thelifeofkenneth.com/lib/electronics_archive/RSGB Low Frequency Experimenter's Handbook.pdf[1] page 81) 3- on the coil side measure the current at the top (antenna wire) and the bottom (ground wire). If they differ some RF current flow in the screen of COAX cable and in the Tx grounding: measure the RF current at the Tx grounding. 4- Record what current increase when the Tx is turned on and check that circuit. Remember that this procedure doesn't need a calibrated meter, but a STABLE meter. 73 de Claudio IK2PII -- -------- [1] http://mirror.thelifeofkenneth.com/lib/electronics_archive/RSGB Low Frequency Experimenter's Handbook.pdf -- 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/?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=5-12 --nextPart3178607.GzEot1m0KS Content-Transfer-Encoding: 7Bit Content-Type: text/html; charset="us-ascii"

On Monday, December 03, 2018 10:56:59 AM you wrote:

 

SNIP

> Of course I do need to measure *antenna* current to be sure it is

> increasing as I expect.

 

My few cents...

 

1- check if the antenna coil and transmitter ground share the same earth/ground connection.

 

2- build the simplest RF current meter (http://mirror.thelifeofkenneth.com/lib/electronics_archive/RSGB Low Frequency Experimenter's Handbook.pdf page 81)

 

3- on the coil side measure the current at the top (antenna wire) and the bottom (ground wire). If they differ some RF current flow in the screen of COAX cable and in the Tx grounding: measure the RF current at the Tx grounding.

 

4- Record what current increase when the Tx is turned on and check that circuit.

 

Remember that this procedure doesn't need a calibrated meter, but a STABLE meter.

 

73 de Claudio IK2PII

 

 

--

 




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