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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: First, the rest of the story on my RX antenna... Last winter I used a 9m tall "low noise vertical" for receiving: http://blog.n1bug.com/2017/11/21/ [...] 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: 5c335215f1b3de26d890ee84d49616ce Subject: 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=TO_ADDRESS_EQ_REAL 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 First, the rest of the story on my RX antenna... Last winter I used a 9m tall "low noise vertical" for receiving: http://blog.n1bug.com/2017/11/21/ It was only about 12m away from the TX antenna. It seemed to work OK for a omnidirectional antenna. This Spring, when I moved it away from the TX antenna, it stopped working. The signal level from the antenna was too low to amplify. I ended up with the noise floor being largely noise of the preamp itself. Today I put the RX antenna back in the original location. Output level from the antenna increased more than 20 dB to the same level it had been last winter. My LF transmitter is not ready so I made some isolation tests at low power with a signal generator. First I connected the signal generator directly to the receiver and verified calibration is linear, eg. for every 10 dB change in generator output level I see exactly 10 dB change at the receiver. I calibrated the receiver so that it would read the same dBm level as the signal generator. Next I connected the signal generator to the TX antenna and measured signal level from the RX antenna into the receiver. Isolation is only 21 dB! This means that during last winter when I was transmitting with 200 watts I probably had about 1.5 watts coming into the receiver. Paul N1BUG