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 vBTAjLMi009154 for ; Fri, 29 Dec 2017 11:45:22 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1eUs5R-00068p-PV for rs_out_1@blacksheep.org; Fri, 29 Dec 2017 10:40:25 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1eUs5P-00068g-L2 for rsgb_lf_group@blacksheep.org; Fri, 29 Dec 2017 10:40:23 +0000 Received: from mout.perfora.net ([74.208.4.196]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.89) (envelope-from ) id 1eUs5M-0001Ma-JZ for rsgb_lf_group@blacksheep.org; Fri, 29 Dec 2017 10:40:22 +0000 Received: from [192.168.1.125] ([72.224.254.201]) by mrelay.perfora.net (mreueus002 [74.208.5.2]) with ESMTPA (Nemesis) id 0MbyuO-1eBh4V1Vqw-00JGKD for ; Fri, 29 Dec 2017 11:40:13 +0100 To: rsgb_lf_group@blacksheep.org References: <1608d073056.marcocadeddu@tin.it> <4556666E6F7849679451F95BD8C43FAA@Clemens0811> <9dbb1de2-0d17-b64f-3051-fd63f1f29cc4@n1bug.com> <51D7E4AF62D34F388A618D1DEA4942D2@Clemens0811> From: N1BUG Message-ID: <5ea52d97-4678-1781-e3b5-6f0d12c6a5fb@n1bug.com> Date: Fri, 29 Dec 2017 05:40:12 -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: <51D7E4AF62D34F388A618D1DEA4942D2@Clemens0811> Content-Language: en-US X-Provags-ID: V03:K0:/bPku7ySH7ZutwxBwujUaNxeL0DX453JfOW9JHSos6y745Jng9w 9SfySfozUFVPfOLU5M5CPE7q3WbiQEjTuqgJxOqIh6QhmWrBcHPQ3iTcXq7e8Sixc/WILEF BvL0YFjVFAOHisjx+8fCoNoGORJOgOUYtVySZOa4INtzSsiP+izx3rggEWBf6zqRssd2KsP 5j8wtVvathoKXMfjhl+nA== X-UI-Out-Filterresults: notjunk:1;V01:K0:ksaN/kW68I4=:SLF/TG8XN76dvwxxwnk3ko UQJWGCHIh8YCC7bLlOvpxZYYxgkhOXSOl5idzdZmtXg6iQqarz0UgyUxcN5gOFRdZ+gE1eoAE HKxlJBbx0DQs5VI022kqhGhZRKzC5DkDhedPjfmpgYf4Rm/BvDHokG+KVqJH+zA9hjAlgQMyS 1mxvuhyjv7+kFJQRuMQZMHeWRqAzfK8MDFXAnB820zsiCI2ekg3eZlCQCh6w9tzcoi5FTzIku tjPSYx6aKmWhAeBI+xrkF2+vN1wWJVT0TXCMEm1c4usm2uKurI/eqY40X5ffu7wETi/MoZKNn rbpGCTilArgg+yq1TIyRYIihGGB3rjaXxVEkTe1uA9qGZVMssDahfmEIC/q8d41q3P2l/MEWk hmHbtxheBPKU/ELe3It2DTID2WT7wLAlThYQ5jjiUmNZZ1sU/6BuJICfS2hdPCWw23pqFLnWq E28k+sEvUYJi7/1MIPxNldlMsw7Yj1HwwI3P4zhtAfhbohkOx7p4OJnmzrcP8WYPMHzzOWuey oqJ5yb1lPBSZyBdk5UDMIg/33otQwYFab4XiUWnDGCzrG2aVhZek0StxgLTqyEYQea+ND8vjn y2ZVLRMtBQJgomc7z+XV33lPJ1KJvAfqLBQb8tBVSoTajJIpkUecaP8AztEUuLkC0f8ByQxlV 8gsYyJQ9NgVbu+0tyRjvhQFVK2YOBg+BanAIace/njJciNYWKsisOhL2lfPs4IOn8SD7NBXRE uUihIHnLRlyzSqYxQHOm/Ava3t0lZ/5D+Q0//YdRusNWu39c1SnZ2pdIifk= 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: During the night I made a few more tests... Iso xfmr at PA output. 14T:14T on FT-114-JC core. Made the problem slightly WORSE. Iso xfmr at amp input. 4T:4T on 3 x BN73-202. Made the problem slightly WORSE. [...] Content analysis details: (0.0 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- X-Scan-Signature: a6b6ffaf48fdddf1ed5c25dc4bf03ee1 Subject: Re: R: 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 During the night I made a few more tests... Iso xfmr at PA output. 14T:14T on FT-114-JC core. Made the problem slightly WORSE. Iso xfmr at amp input. 4T:4T on 3 x BN73-202. Made the problem slightly WORSE. Removed iso xfmr from amp output, left iso on PA input. Slightly better than without iso anywhere, but still bad. Tried again all configurations of iso xfmrs (at antenna, at PA output, at PA input) using HP 3325B to drive the PA. No difference from using the Ultimate 3S. When I use an iso xfmr at the antenna the problem is WORSE than when I have the coax connected to the antenna ground. It's not a big change, but measurable and repeatable. Considered this might be an instrumentation problem with RF affecting the HP 1980B oscilloscope, but I can see the signal quality degrade in a receiver when the problem occurs so I don't think so. I can try common mode chokes instead of isolation transformers, but will this really be better? Seems if the problem is common mode current the iso xfmrs should kill it...?? I still have a couple of ideas to try: Replace 50uH choke in PA with different type core. Use completely separate bias supply. However since the PA works perfect into a dummy load I am not sure the PA is the problem. I will try to make a shielded box for the PA. That will take some time. The Ultimate 3S is in the metal case sold for it. This is not great because of the paint (or powder coat) at mating surfaces. I will try to work on that but since using the HP 3325B as a PA driver does not make any change I have doubts this will help. Paul N1BUG