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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 Paul, An interesting story :-) Congrats to the latest improvements! Am 25.11.2018 20:08, schrieb N1BUG: > 1. Loaded Q is much higher!!! > Expected. > 2. I had to move the tap further up the coil to resonate the system > (less inductance.... or at least fewer turns). > [...] Content analysis details: (-2.3 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -2.3 RCVD_IN_DNSWL_MED RBL: Sender listed at http://www.dnswl.org/, medium trust [185.67.36.66 listed in list.dnswl.org] -0.0 SPF_PASS SPF: sender matches SPF record 0.0 T_DKIM_INVALID DKIM-Signature header exists but is not valid X-Scan-Signature: 5f132ffce194fb93f2267a462d849f2b Subject: Re: LF: No 2200m TX tonight Content-Type: text/plain; charset=UTF-8; format=flowed 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=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 Paul, An interesting story :-) Congrats to the latest improvements! Am 25.11.2018 20:08, schrieb N1BUG: > 1. Loaded Q is much higher!!! > Expected. > 2. I had to move the tap further up the coil to resonate the system > (less inductance.... or at least fewer turns). > Also expected. The suhort cut turn reduced the inductivity. Now when the shortcut is gone, it will be higher so you need a few turns less, which again ruduces the losses! :-) > Must be something heating up very slowly, then cooling quickly after > RF stops. That is very strange! Thermal capacity and time constants should be the same when heating up or down. How much antenna current do you get at 100 W RF power? If you say you have a scopematch, i assume you mean that you are the curves of voltage and current on an oscilloscope, right? I have thoughts about EMI into the power supply or exciter but this is unlikely since you have a decoupling xfmr at the antenna feed point. Is your antenna earth separated from the mains earth? If not, try to separate it and see if the effect is still there, apart from the lower antenna current. And maybe it is worth to control the DC supply voltage of the exciter and PA during the effect starts. If the PA runs at 12V, use a battery and a floating signal generator. These are my next thoughts. 73, Stefan > But I cannot find it. I think I have to buy one of the > inexpensive IR heat guns and try to examine the coil and hardware > while the TX is running. Maybe it will see something. > > Now we have freezing rain and snow so I had to stop all testing. No > good wx forecast until Thursday! > > 73, > Paul > > > > >