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[82.70.254.222]) by smtp.gmail.com with ESMTPSA id d10-v6sm1155485wrv.70.2018.09.12.03.53.39 (version=TLS1 cipher=AES128-SHA bits=128/128); Wed, 12 Sep 2018 03:53:40 -0700 (PDT) Date: Wed, 12 Sep 2018 11:53:38 +0100 From: Chris Wilson X-Priority: 3 (Normal) Message-ID: <23142956.20180912115338@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 RX protection sought for either a Kenwood TS-590 or a Red Pitaya functioning as an SDR for the LF 136kHz band. Change over relay box for the antenna has a 60 Amp automotive relay grounding the RX line and changing to switching the antenna to the amp with a Russian high power co-axial relay 500mS before TX starts. In case of unforeseen whoopsie an automotive 5W festoon bulb would be in series with RX antenna input prior to two back to back 6A10 diodes? The festoon bulb is long enough not to sustain an arc over (I have tested on full power one side of the bulb to ground). I don't believe the inductance of the bulb is significant "down there" frequency wise. But I am unsure about the effect of the big diodes... [...] 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:c09:0:0:0:232 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: 0a4643e586472c13187d293ec5d096c2 Subject: LF: RX protection scheme, is this sound??? 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 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 RX protection sought for either a Kenwood TS-590 or a Red Pitaya functioning as an SDR for the LF 136kHz band. Change over relay box for the antenna has a 60 Amp automotive relay grounding the RX line and changing to switching the antenna to the amp with a Russian high power co-axial relay 500mS before TX starts. In case of unforeseen whoopsie an automotive 5W festoon bulb would be in series with RX antenna input prior to two back to back 6A10 diodes? The festoon bulb is long enough not to sustain an arc over (I have tested on full power one side of the bulb to ground). I don't believe the inductance of the bulb is significant "down there" frequency wise. But I am unsure about the effect of the big diodes... Amp is a 1kW Class D FET amp, is this a sound scheme? The TX has a separate exciter and the SDR or TS-590 function solely as a receiver but sharing the TX antenna. Thanks. -- Best regards, Chris mailto:dead.fets@gmail.com