Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on lipkowski.org X-Spam-Level: X-Spam-Status: No, score=-0.7 required=5.0 tests=FREEMAIL_FORGED_FROMDOMAIN, FREEMAIL_FROM,HEADER_FROM_DIFFERENT_DOMAINS,HTML_MESSAGE,MIME_HTML_ONLY, RCVD_IN_DNSWL_MED,RCVD_IN_SORBS_SPAM,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 X-Spam-DCC: : mailn 1480; Body=2 Fuz1=2 Fuz2=2 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by lipkowski.org (8.14.4/8.14.4/Debian-8+deb8u1) with ESMTP id v0UJmALu004531 for ; Mon, 30 Jan 2017 20:48:11 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1cYHsD-0002gr-2H for rs_out_1@blacksheep.org; Mon, 30 Jan 2017 19:44:21 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1cYHsA-0002gi-49 for rsgb_lf_group@blacksheep.org; Mon, 30 Jan 2017 19:44:18 +0000 Received: from mout.web.de ([212.227.15.14]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.87) (envelope-from ) id 1cYHs7-0004H6-IF for rsgb_lf_group@blacksheep.org; Mon, 30 Jan 2017 19:44:16 +0000 Received: from [79.214.78.216] by 3capp-webde-bs04.server.lan (via HTTP); Mon, 30 Jan 2017 20:44:14 +0100 MIME-Version: 1.0 Message-ID: From: "Hans-Albrecht Haffa" To: Langwellen-Reflektor Date: Mon, 30 Jan 2017 20:44:14 +0100 Importance: normal Sensitivity: Normal X-Priority: 3 X-Provags-ID: V03:K0:HA4HI3bLSEbGi7ptW7D33MYN/1iDqh9T+/wsWiYuKQc 4RC2emm7Xt7TpDOtavcbaRu9eLEjphIMS1+RtQ2ZAyH+1RaVCS vnScaunNZAjthzJBq5ONofLScXfqWd/+bLUfZdLK92O7TZA9hp 1Bf47Qs5j1uHTdMGDPJpumuHPCBjU3obpCMMvWX3nRUur6uTiL xkbStIfd1tjCguH7oIbjL1kuNMM0NSiYhqk/xuXkkQ51ElqP0K Kx+vc/Sl1fNa/9glaMFDaOBzC+CM9qGKFCkfDlprIJUyRhhufw qtyNnk= X-UI-Out-Filterresults: notjunk:1;V01:K0:RM3OKIZTFOA=:whFJ0NQzWwDlPaYF9Q6jhx QOKiuWaLxyz4K0c/DhzKUxloQ19MWo7Y8fODgVg1EymX77og8JX1N7rf9LouC1BtI4Uk3LFAp Mon3k7dyz/pjD1/I+26/eTSM4dqdQzyje7t3m4ZQytjaFOqSBVF00jHZul/yjw4cyjGY6xtuB 3VfxQBVZEjEPNKrZNxcqmOTBMuZTR3Js2H/UbAwlk5Wyfqe7iwrZIS3C40tP0mRVLCQ9ssV5q shf5RivVuyGmeRIkOPHWDAHStQx/Ns4+GIXu2NummYTkA7z436rQ0eIbXR64JMPApG4ivikYe 2SFbbAY8jQqKyFYu3wf7CJqP8MuH3kM3dg3FOGOzGtxHMSVbXUrVPGmfkQMg372HtrTCBoT0x cTvMkAFWvSSYpMDQbdWpxTDjYLkWKwqVP/mGPHJe+6qi36LHBjT79Iz7nmUzfkMC29WL7+92u 8Z4c1DGCQw== X-Scan-Signature: cc2e5baae40f8f7a09b47e6877ef0bfb Subject: LF: TRX-switching Content-Type: text/html; charset=UTF-8 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 X-Scanned-By: MIMEDefang 2.75 Status: RO X-Status: X-Keywords: X-UID: 10415

Dear OMs,

kindly I ask You for ideas for a TRX swiching circuit with pin diodes for LF and MF. In the magazine "Funkamateur" 2/2017 an article of Donald Huff, W6JL ist published, using PIN-diodes 1N4007. A similar publication will find in the internet too from K9EW ("Boat Anchor QSK "). Both authors are using succdessfully rectifier diodes for 50 Hz as PIN Diodes for switching 1, 8 MHz until 30 MHz. Pin Diodes have a minimum usable frequency based on reverse recovery time of the diode, usually higher than 1 MHz.

I need `nt a full switching circuit, as I have a power output of the vac relais (Jennings dpdt (2 mal um), too slow for qsk) in receive path of abt -17 dbm in transmit mode, and I wish to a have an output of abt 30 uV (-77dbm) in receive path. A complete blocking of receive path ist not necessary, as I need a bit of TX-sig for having a sidetone in transmit mode. I use a "Line"(...what an old fashioned expression for an not affordable equipment......). Solving the problem by muting the receiver, adding a side tone in an audio-postamplifier for the head phone means additional circuitry around about the receiver, what I want to avoid .

Your proposal? Any ideas welcome.

55, Hans-Albrecht

DK 8 ND