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[82.70.254.222]) by smtp.gmail.com with ESMTPSA id l73sm10756796wrc.50.2017.12.24.15.03.52 (version=TLS1 cipher=AES128-SHA bits=128/128); Sun, 24 Dec 2017 15:03:52 -0800 (PST) Date: Sun, 24 Dec 2017 23:03:51 +0000 From: Chris Wilson X-Priority: 3 (Normal) Message-ID: <1325698854.20171224230351@gmail.com> To: Andy Talbot CC: dead.fets@gmail.com In-Reply-To: References: <4ffc7958-810a-e4d2-7745-258a58338934@n1bug.com> <5A3AE81B.9010205@posteo.de> <5A3B8FB1.1020403@posteo.de> <7ee833a8-04b4-4712-d927-7eccf37eec14@n1bug.com> <5A3D9BC1.1040609@posteo.de> <6fa587ef-d5b0-6a67-b604-ba94144444f7@n1bug.com> <5A3E77DD.4090908@posteo.de> <103A2C60B87B4930A99ED33442E477AF@StevePC> <792271d9-34bb-3fb1-140c-c322015e2e9b@n1bug.com> <5A3F9D04.90800@posteo.de> <6be50d62-c33c-a781-1138-268803e0b6f1@n1bug.com> MIME-Version: 1.0 X-Spam-Score: 0.0 (/) 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 the administrator of that system for details. Content preview: Hello Andy, Is there any point in Paul putting his dummy load on the end of his 75 odd meters of feeder co-ax outside? And then on the secondary of his matching transformer when tapped one to one? In case the co-ax is iffy or the impedance matching transfomer's doing something odd? [...] Content analysis details: (0.0 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- 0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider (dead.fets[at]gmail.com) 0.0 T_DKIM_INVALID DKIM-Signature header exists but is not valid X-Scan-Signature: 49f0f587e44d6711c57b8a4e950ba850 Subject: Re: LF: TXing 2200m WSPR Content-Type: text/plain; charset=utf-8 X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.8 required=5.0 tests=PRIORITY_NO_NAME 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 Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from quoted-printable to 8bit by klubnl.pl id vBON832R020782 Hello Andy, Is there any point in Paul putting his dummy load on the end of his 75 odd meters of feeder co-ax outside? And then on the secondary of his matching transformer when tapped one to one? In case the co-ax is iffy or the impedance matching transfomer's doing something odd? Sunday, December 24, 2017, 10:42:16 PM, you wrote: > Well ...    Using exactly the values in the filter circuit diagram, > 50R transforms through the filter to 48.5 - j2.86 (Ret Loss = 30dB,  > VSWR = 1.07)   [Using GM3SEK's original Netcalc prog.] > So that's pretty conclusive the ideal filter values will not be > upsetting things at the fundamental frequency.     > According to Google, the  T106-2 has a stated Al value of  13.5nH > /turn^2  so 72 turns does indeed give 70uH.   So IF your core is correct, the filter should be OK. > It's a bit difficult from now on, at a distance, to try to work out what is happening. > Anyone else, any suggestions ? > BTW ... > Peak to peak of a { symetrical }square wave needs to be multiplied > by 4/pi to get the peak-to-peak of the fundamental component.   So > the amploitude you see will be lower by about 1.3 times for teh same fundamental power component.  > Andy  G4JNT -- Best regards, Chris mailto:dead.fets@gmail.com