Return-Path: X-Spam-DCC: paranoid 1233; 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=-2.6 required=5.0 tests=BAYES_00,HTML_MESSAGE, MIME_HTML_ONLY autolearn=unavailable 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 sBLFhtOt003071 for ; Sun, 21 Dec 2014 16:43:55 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Y2iaJ-0005LP-VY for rs_out_1@blacksheep.org; Sun, 21 Dec 2014 15:38:19 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Y2iaJ-0005LG-NW for rsgb_lf_group@blacksheep.org; Sun, 21 Dec 2014 15:38:19 +0000 Received: from mout.web.de ([212.227.15.14]) by relay1.thorcom.net with esmtp (Exim 4.84) (envelope-from ) id 1Y2iaI-0002iq-1q for rsgb_lf_group@blacksheep.org; Sun, 21 Dec 2014 15:38:18 +0000 Received: from [87.184.109.198] by 3capp-webde-bs34.server.lan (via HTTP); Sun, 21 Dec 2014 16:38:16 +0100 MIME-Version: 1.0 Message-ID: From: "Hans-Albrecht Haffa" To: Langwellen-Reflektor , "Hans-Albrecht Haffa" Date: Sun, 21 Dec 2014 16:38:16 +0100 Importance: normal Sensitivity: Normal X-Priority: 3 X-Provags-ID: V03:K0:TIXh7A9m6WI9FmJnyPO3wpYqKP+hJesx1+w90tp+Gsw 8dmidA/n4UCotASqwuj7H6Oha0PiKxM8S5HXJ+0Jk1N+Wjui1J foQS6uj0vSOQ8F+8bRszWmKMlt6Xvh0iy1OuhvlcIBhA2j6Eb5 rPGhXl+phNPZ4J9i3Da730QeX6NwPchm46AL5766GDzRYd1XOg 5Sxm54gTaoTPsHbIaTXY0oCyuBR6U50rzTIdS8H1JlSXFewOXp kmmqn3Ut3bwg53r6M/piHkqJ/h6JVSthS3k6IPJAbWYBH1UlFd 4HyTAI= X-UI-Out-Filterresults: notjunk:1; X-Scan-Signature: bb61bee384896e075004ae5ec954ddd2 Subject: LF: Low pass filter 1 kW 136k 472 k what components to choose? 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 2.56 on 10.1.3.10 Status: O X-Status: X-Keywords: X-UID: 1553

Dear OMs,
just a question strait forward: What componnets I should choose for a low pass filter for 136 kHz and 472 kHz, two filters to be designed.

136 kHz: Pin abt 1,5 kW

472 kHz: Pin abt 0,5 kW

SWR: s = 1...2,5 when mated, in case of failure more

a five-pole low pass will probably be sufficient.

My Question:

What iron powder cores or air coiles will do it, known or proofed by experiment? Diameter, marterial grade?

What capacitors? max. Voltage. High voltage caps from Wima (Ucd=4kV or 8 kV) are not available at distributors, mica capacitors will hardly fit in capacitiy value or in voltage, when in my collection.

The calculus of magnetic circuits is not a problem for me, but it is easier to start with components that will fulfill the demands.

Waiting to Your kind anwer,

55, Hans-Albrecht

DK 8 ND