Return-Path: X-Spam-DCC: paranoid 1182; Body=2 Fuz1=2 Fuz2=2 X-Spam-Checker-Version: SpamAssassin 3.1.3 (2006-06-01) on lipkowski.org X-Spam-Level: X-Spam-Status: No, score=-2.2 required=5.0 tests=BAYES_00,DNS_FROM_AHBL_RHSBL, FORGED_RCVD_HELO,SPF_PASS autolearn=no version=3.1.3 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by paranoid.lipkowski.org (8.13.7/8.13.7) with ESMTP id u7QChILM027115 for ; Fri, 26 Aug 2016 14:43:19 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1bdGNA-0005W2-1I for rs_out_1@blacksheep.org; Fri, 26 Aug 2016 13:36:36 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1bdGN7-0005Vt-AS for rsgb_lf_group@blacksheep.org; Fri, 26 Aug 2016 13:36:33 +0100 Received: from rhcavuit01.kulnet.kuleuven.be ([2a02:2c40:0:c0::25:129] helo=cavuit01.kulnet.kuleuven.be) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.87) (envelope-from ) id 1bdGN4-00062q-Lu for rsgb_lf_group@blacksheep.org; Fri, 26 Aug 2016 13:36:31 +0100 X-KULeuven-Envelope-From: rik.strobbe@kuleuven.be X-KULeuven-Scanned: Found to be clean X-KULeuven-ID: ED0C91380A3.A4EE6 X-KULeuven-Information: Katholieke Universiteit Leuven Received: from icts-p-smtps-1.cc.kuleuven.be (icts-p-smtps-1e.kulnet.kuleuven.be [134.58.240.33]) by cavuit01.kulnet.kuleuven.be (Postfix) with ESMTP id ED0C91380A3 for ; Fri, 26 Aug 2016 14:36:26 +0200 (CEST) Received: from ICTS-S-EXMBX24.luna.kuleuven.be (icts-s-exmbx24.luna.kuleuven.be [10.112.11.59]) (using TLSv1.2 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by icts-p-smtps-1.cc.kuleuven.be (Postfix) with ESMTPS id E7B6840A8 for ; Fri, 26 Aug 2016 14:36:26 +0200 (CEST) Received: from ICTS-S-EXMBX27.luna.kuleuven.be (10.112.11.62) by ICTS-S-EXMBX24.luna.kuleuven.be (10.112.11.59) with Microsoft SMTP Server (TLS) id 15.0.1178.4; Fri, 26 Aug 2016 14:36:26 +0200 Received: from ICTS-S-EXMBX27.luna.kuleuven.be ([fe80::291a:cc4f:6953:698a]) by ICTS-S-EXMBX27.luna.kuleuven.be ([fe80::291a:cc4f:6953:698a%33]) with mapi id 15.00.1178.000; Fri, 26 Aug 2016 14:36:26 +0200 X-Kuleuven: This mail passed the K.U.Leuven mailcluster From: Rik Strobbe To: "rsgb_lf_group@blacksheep.org" Thread-Topic: A simple ULF/MF diplexer? Thread-Index: AQHR/5AFn3FJLOg3DkmTjk8NCZZtrqBbKaYi Date: Fri, 26 Aug 2016 12:36:26 +0000 Message-ID: <1472214987642.19825@kuleuven.be> References: <579355A36AEE9D4FA555C45D556003AB5D7D1BA1@servigilant.vigilant.local>,<57C02C0F.1070706@posteo.de> In-Reply-To: <57C02C0F.1070706@posteo.de> Accept-Language: nl-BE, en-GB, en-US Content-Language: nl-BE X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.112.50.1] MIME-Version: 1.0 X-Scan-Signature: 739d4fb39bd02fc5a2de5437a39bb056 Subject: LF: Re: A simple ULF/MF diplexer? Content-Type: text/plain; charset="iso-8859-1" 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 2.56 on 10.1.3.11 Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from quoted-printable to 8bit by paranoid.lipkowski.org id u7QChILM027115 Status: RO X-Status: X-Keywords: X-UID: 8633 Hi Stefan, if you can keep both transmitters from feeding power into each other it should work. But one thing to keep in mind is that the 2nF parallel capacitor needed on ULF will reduce the overall (antenna + parallel C) resistance at 475kHz significantly. It is not clear to me what configuration you intend to use, but maybe you should try to avoid that the 2nF cap is drawing a lot of 475kHz current. 73, Rik ON7YD - OR7T ________________________________________ Van: owner-rsgb_lf_group@blacksheep.org namens DK7FC Verzonden: vrijdag 26 augustus 2016 13:46 Aan: rsgb_lf_group@blacksheep.org Onderwerp: LF: A simple ULF/MF diplexer? Hi all, I would like to run some transmissions on MF WSPR but i also like to run a longer transmission on 2.97 kHz. In the current ULF TX installation i'm using a parallel 2 nF capacitor anyway. This is just -j167 Ohm on MF. I could series compensate it with 65 uH (which is just j1.2 Ohm at 2970 Hz :-) ) to ground. The 65 uH could be parallel compensated for MF, using 280 nF. Then i could add a ferrite transformer to apply the MF RF across the 65uH/280nF parallel circuit. The large loading coil of 1.3 H will be a high impedance, hopefully, as long as there is no internal resonance on MF due to its own winding capacity. The 2 nF capacitor will have to handle the sum current of ULF and MF. QRO is not possible on MF i think but it will handle a few watts which is fine for WSPR. Hmm, worth a try? 73, Stefan