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 vBNKQZLA014033 for ; Sat, 23 Dec 2017 21:26:38 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1eSqCC-0008A0-Hv for rs_out_1@blacksheep.org; Sat, 23 Dec 2017 20:15:00 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1eSqCB-00089r-Dr for rsgb_lf_group@blacksheep.org; Sat, 23 Dec 2017 20:14:59 +0000 Received: from mout.perfora.net ([74.208.4.197]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.89) (envelope-from ) id 1eSqC8-0002cx-HP for rsgb_lf_group@blacksheep.org; Sat, 23 Dec 2017 20:14:58 +0000 Received: from [192.168.1.125] ([72.224.254.201]) by mrelay.perfora.net (mreueus003 [74.208.5.2]) with ESMTPA (Nemesis) id 0LkiZ8-1f0o251Lc4-00aSk6 for ; Sat, 23 Dec 2017 21:14:53 +0100 To: rsgb_lf_group@blacksheep.org 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> From: N1BUG Message-ID: Date: Sat, 23 Dec 2017 15:14:51 -0500 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.5.0 MIME-Version: 1.0 In-Reply-To: <5A3E77DD.4090908@posteo.de> Content-Language: en-US X-Provags-ID: V03:K0:ufUM7Yh3ygfWmVmGb6xso1/JIcp+0/UrlemflNgzsvHGVnbOwb3 NJfkQHezK8LO6MXPCi5AxxBWEK1t1iZ1fnjN06BZrNHs1zgsVARArVMWmS2JuAZ+tlY0H1l k4K+XUwnMaxgQpGSv1fRMpswOYnIXMl7u8ghVwVOviRkeFy9s7mzwdQbL50jeILRXJn5QxJ bzC5lEOhG4U4p7acMce3g== X-UI-Out-Filterresults: notjunk:1;V01:K0:CbpDLo1CzwY=:9/N7pKlZkExnd0RlvvIr/a F295PXkPteWG6ryBacBEifu0fmrZb1uhzz2Ubg4MsePT4ELLTzm8TTuZrDzXer9yORDZFWjs6 6kIaX9LpiFsa+hyMCqtzkC4LTSBrTWh97qfC/Xo+y0n2Va0AkMCqIaVLIuwLmwUgZH/irCiil 5/pUMuNAVtCsvcooEVHroyqobf1XJOTuIqRy/g4UmtBriS5slntaoz/34QitHw7V/rhn6zaRx V6sr/frwu6kkyNnYTRnAnnLEVj3VeM0RCnbkadD5sMOCZiS3f2K7vx14qWXofuFlNK2FIlcvn 9xAhxah1yWjKtTktyH+FaDnU05YlEbsoLNNnyGJTylVaTBdJEvtdgXHX3t60cY2v7BBkrt+ka nd1Z0BI7m16biRZWmDSBz3ADBuNuYTEE2aIW3Go8ig2cciAL64YpRouJch6A+RY3LIVYaj0EY IfUixYjIfGztHR6asdVyclj4H9DibD7os5bDm1L9R7RnPjVMpa3+P9c7xp14hCEyIsikfdjIr gZKeon/16cSjwjTaPMpjXzfYwmFJdrRdULpuQ2uTjOm7lC3XKgL5WHG++frGYRpd7CUPhqFVG swQiEhHM2voXys9WqotcuuP+y9zpOkgIV8AtFkeCtqI3YzSn7LCVm9UhsMJZtpATyPocnr8Fq DDBYSbiycee7G7oe6KCiUm8JDVBgq8YYpNx7QkALOWI7PAxlMAeLYjG+Ixz01ybZk6XpYrOzq rM3p2iCab5P/E9nuQNzSBXgLnUHG+tN1459G/pfLVK0q2jPpCcwO9NcO0Z0= 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: Hi Stefan, > Does the blue core become warm during operation? No, it stays completely cold. Same for the two cores in the LPF. [...] Content analysis details: (0.0 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- X-Scan-Signature: 0a4643e586472c13187d293ec5d096c2 Subject: Re: LF: TXing 2200m WSPR 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 Stefan, > Does the blue core become warm during operation? No, it stays completely cold. Same for the two cores in the LPF. > How does the drain-voltage look like? It is hard to describe and so far I am not able to provide a photo. Not enough hands to hold probes and camera! I would say it is a train of positive going pulses, rounded, not square, with some ripple between (not a flat line between pulses). I will try to get a photo in the next days. It will run perfectly stable into the 50 ohm dummy load at 25 watts output. Into the antenna it will do no better than 17 watts, usually less before something goes wrong. I think I am starting to understand what I am seeing. It looks to me like a low frequency oscillation, well below the band, maybe at audio. I do not yet understand why or how to stop it. I wonder if putting a larger C in parallel to the 1 uF that bypasses the 68 ohm resistor to ground would maybe do something? I will try it. 73, Paul N1BUG