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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: Hi Claudio, You give some very interesting ideas !! I will try to make some of the measurements you suggest. It should be interesting to check RF current in different places. Content analysis details: (0.0 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at http://www.dnswl.org/, no trust [74.208.4.197 listed in list.dnswl.org] 0.0 RCVD_IN_MSPIKE_H3 RBL: Good reputation (+3) [74.208.4.197 listed in wl.mailspike.net] -0.0 SPF_HELO_PASS SPF: HELO matches SPF record 0.0 RCVD_IN_MSPIKE_WL Mailspike good senders X-Scan-Signature: 1708620d3ce65bee0beaaede7929769a Subject: Re: LF: More on unstable antenna R Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 8bit 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 Hi Claudio, You give some very interesting ideas !! I will try to make some of the measurements you suggest. It should be interesting to check RF current in different places. Thank you ! 73, Paul On 12/5/18 4:18 AM, Claudio Pozzi wrote: > 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