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Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 MIME-Version: 1.0 In-Reply-To: <5B4C88EF.1090800@posteo.de> Content-Language: en-US X-Provags-ID: V03:K1:SZuUTK2221j4p6tVI6CVFcvwB2APV2VV05PykQe5uwEhjfgPKsJ NGPib/Tvw9+8jVu5V2JvZye4yvn2hfM8I6O1P39uc5IDyHj0QFDHmWDc4b0uq3ztrF73qmW CT8BqN0HZe8iEoB8tfqXLQbmS80Qf0IZE/+ijd42Ezon4GplaSKxT5mB9H9x7ACmVwvoo9i Xe6RXOWTFHNxGx+mUaz4A== X-UI-Out-Filterresults: notjunk:1;V01:K0:LhQYIIkSB7w=:HIwHhIF5RGe4hhAbRwtyv/ /lXXVQzanxJ9y/4aYKaS01JjKYkxupH2u7TjEYbgrs66dgMevF8+UURAhFVWPNZgeBwQuav8+ haU9FSSd3Cg0RiFdkgLizOwxXeU+4z/r66q/AOhGZbTccGtUosI2Xzeyirhx+mrT3Ewzh/jPL pnlQbPCmDDEeuilsU+839z0kMD19uv0R9yh2pOjIzbTUOp9N/Vgk25VnCNhKobxqfbxLXN7Qs kQM+4g3c/0C1QNwy4cTfyVVcG5AbbEhmaACbQYMOkXTq+4xzja6/F80sjKivGqc639fhRGZ3i vh1n9Yt3nKVzN6J1DdiSEdp+T3lVzKQ7DiPaXsa59TeUvmF9zsEuq8CagRimmwHOJqGDbAZ9G FA3nJdlA3KAfdHXNnOTblsrfGeKear0CywcbpwNCP97Lgq4KAtpgJv8oHrXH+WLass4KWhSSc M2r8R4K3+tcazX9sEKGqXskhGocrhbVQvfrqjr9JY0NfJlZYOpf0uuI0KVjptsRBbUfVQur9R tzR7FgTiZYSRJ6MN4+xmA8ld3zfWIREFrKq83MVfMBms+QywaqqmStYpe2YaxslTA8ObJGAYD 1yWaqbVIpX8OsvWPBWA+5nSSFC+vwO4ld5juY3G/hVOtZTm0hzAa8WhMA5uKuC3r7a3kZ/098 vX3r/UlSPztO30xo7eOZQzgSP02KGJIE2x48XJiqxeO5sdyhUY2l4aKeqhMiHVIlrG6KKEchj jEDzBpt1VED1sU0+ 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 @@CONTACT_ADDRESS@@ for details. Content preview: Hi Stefan, On 07/16/2018 08:00 AM, DK7FC wrote: > What type of preamp are you using (schematic?). For a comparison with > and without antenna, you need to replace the antenna wire with a > capacitor of the same C (assume 5...6 pF/m antenna wire, i.e. use 56 pF > to replace a 10m vertical) connected to the preamp. If this shows as > e.g. -120 dBfs it should show -105 dBfs with the antennna connected. [...] Content analysis details: (-0.0 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at http://www.dnswl.org/, no trust [74.208.4.197 listed in list.dnswl.org] -0.0 RCVD_IN_MSPIKE_H3 RBL: Good reputation (+3) [74.208.4.197 listed in wl.mailspike.net] -0.0 SPF_HELO_PASS SPF: HELO matches SPF record -0.0 RCVD_IN_MSPIKE_WL Mailspike good senders X-Scan-Signature: 2e2f7cbbe9f38dd7bf3fac4fc012e6fc Subject: Re: LF: TX > RX isolation test Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit 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, On 07/16/2018 08:00 AM, DK7FC wrote: > What type of preamp are you using (schematic?). For a comparison with > and without antenna, you need to replace the antenna wire with a > capacitor of the same C (assume 5...6 pF/m antenna wire, i.e. use 56 pF > to replace a 10m vertical) connected to the preamp. If this shows as > e.g. -120 dBfs it should show -105 dBfs with the antennna connected. I am not certain we are talking about the same antenna configuration. This antenna is not an E probe, at least not in the sense that I understand it. It's a 9m tall whip with 100:1 impedance transformer at the base. The high Z primary winding connects to antenna and ground. The low Z secondary goes to 60m of twisted pair to the shack. At the shack there is a 2:1 transformer feeding a 50 ohm in/out preamp. This is the preamp I use: http://w1vd.com/LFMFHFpreamplifier.pdf I can not quite put into words what bothers me about my system but I get a feeling something is wrong. I think I need to go back to the beginning and try to understand noise floor / MDS at every stage of the system... receiver without preamp, with preamp, etc. I am not sure exactly how to proceed with this evaluation. Paul N1BUG