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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, Am 20.11.2018 11:54, schrieb N1BUG: > I would like to transmit as well, but the PA is not repaired. I must > look into it to see if anything in addition to the FETs is dead, > then order FETs and what [...] 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: 086f3faad0220c9ae57a7913e711a86d Subject: Re: LF: WSPR-15 last night 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, Am 20.11.2018 11:54, schrieb N1BUG: > I would like to transmit as well, but the PA is not repaired. I must > look into it to see if anything in addition to the FETs is dead, > then order FETs and whatever other parts... > > When the PA is repaired I need to do some more testing before I try > WSPR-15. Don't waste to much time, it is now the best time in the season! Do you have a second PA, maybe a QRP version? Still worth to try! > During every WSPR-2 TX period, the scopematch shows the > resistance of the antenna decreasing during the transmission. Maybe you can run a permanent carrier and reach negative R values then? The world's energy problems will be finally solved! ;-) > I am > worried this is caused by something heating. Maybe the ferrite in > the antenna matching transformer, maybe the the big coil? Or maybe > it is in the scopematch detector itself but that would be a little > difficult to believe. I would like to find the cause of this before > transmitting the long WSPOR-15 periods. > Depends on how you measure the current. A saturating current transformer will become warm or hot. Should be easy to check. Or it is an iron dust core thermally drifting away. It is useful to measure the voltage behind the LPF. Just some spontan thoughts. > I just woke up and sent the rest of my overnight spots to WSPRnet: > DK7FC and DF6NM. > Nice. I see, not better than -30 dB. With WSPR-15 we are on the save side. 73, Stefan