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[82.70.254.222]) by smtp.gmail.com with ESMTPSA id f17-v6sm3183903wrs.1.2018.08.23.04.08.02 (version=TLS1 cipher=AES128-SHA bits=128/128); Thu, 23 Aug 2018 04:08:02 -0700 (PDT) Date: Thu, 23 Aug 2018 12:08:01 +0100 From: Chris Wilson X-Priority: 3 (Normal) Message-ID: <1613303827.20180823120801@gmail.com> To: "rsgb_lf_group@blacksheep.org" 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 @@CONTACT_ADDRESS@@ for details. Content preview: Hello LF'ers Is anyone able and willing to advise on my band pass RX filter design please? I have made a band pass filter for 137kHz reception and checked it with my SDR in real time. It is shifted a little high and I am wondering what I need to change to pull it a bit lower? Any practical advice or component values welcome. Adjustability would be nice! Thanks [...] 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 [2a00:1450:400c:c09:0:0:0:230 listed in] [list.dnswl.org] 0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider (dead.fets[at]gmail.com) -0.0 SPF_PASS SPF: sender matches SPF record 0.0 T_DKIM_INVALID DKIM-Signature header exists but is not valid X-Scan-Signature: 87966b345956c8ef3389b993f6a18f4e Subject: LF: Anyone good with Elsie? Content-Type: text/plain; charset=us-ascii 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=0.8 required=5.0 tests=PRIORITY_NO_NAME, 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 Hello LF'ers Is anyone able and willing to advise on my band pass RX filter design please? I have made a band pass filter for 137kHz reception and checked it with my SDR in real time. It is shifted a little high and I am wondering what I need to change to pull it a bit lower? Any practical advice or component values welcome. Adjustability would be nice! Thanks Filter design is at http://www.chriswilson.tv/lf-circuit.jpg Real world results at : http://www.chriswilson.tv/passband.jpg ELSIE plot at : http://www.chriswilson.tv/lf-plot.jpg -- Best regards, Chris mailto:dead.fets@gmail.com