Return-Path: Received: (qmail 27261 invoked from network); 12 Apr 2001 13:55:37 -0000 Received: from unknown (HELO warrior-inbound.servers.plus.net) (212.159.14.227) by 10.226.25.101 with SMTP; 12 Apr 2001 13:55:37 -0000 Received: (qmail 22179 invoked from network); 12 Apr 2001 13:55:29 -0000 Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by warrior with SMTP; 12 Apr 2001 13:55:29 -0000 Received: from majordom by post.thorcom.com with local (Exim 3.16 #2) id 14nhM1-0001RV-00 for rsgb_lf_group-outgoing@blacksheep.org; Thu, 12 Apr 2001 14:41:45 +0100 Received: from tungsten.btinternet.com ([194.73.73.81]) by post.thorcom.com with esmtp (Exim 3.16 #2) id 14nhLz-0001RN-00 for rsgb_lf_group@blacksheep.org; Thu, 12 Apr 2001 14:41:44 +0100 Received: from [213.122.255.66] (helo=default) by tungsten.btinternet.com with smtp (Exim 3.03 #83) id 14nhLV-0004N4-00 for rsgb_lf_group@blacksheep.org; Thu, 12 Apr 2001 14:41:13 +0100 Message-ID: <001b01c0c355$f2388240$42ff7ad5@default> From: "Alan Melia" To: "LF-Group" Subject: LF: Aerial Diplexer for 136 Date: Thu, 12 Apr 2001 14:38:16 +0100 MIME-Version: 1.0 Content-Type: multipart/mixed; boundary="------------080805070401060300000707" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 4.72.3110.5 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group Sender: This is a multi-part message in MIME format. --------------080805070401060300000707 Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 8bit Hi all, Dick PA0SE, remarked some time ago that a diplexer with an absorbtive load for the unwanted harmonics might help to tame some of the ' FET-eating' TXs. I pushed some numbers into the normalised circuit given in the 2001 ARRL Handbook. I used a 'cross-over ' of 160kHz (which may be too low, the equations are in a simple spread sheet so easily re-run) but the resultant circuit does not look too difficult. The coil values are in the region that could be wound on iron dust or low loss ferrite torriods. I have frequency plots, which are probably a little big to be accepted by the reflector, but I will gladly post them direct to anyone interested. Cheers de Alan G3NYK Alan.Melia@btinternet.com --------------080805070401060300000707 Content-Type: image/gif; name="LFDIPLEX.gif" Content-Transfer-Encoding: base64 Content-Disposition: inline; filename="LFDIPLEX.gif" R0lGODdhEwJdAfcAAAAAAP////////////////////////////////////////////////// //////////////////////////////////////////////////////////////////////// //////////////////////////////////////////////////////////////////////// //////////////////////////////////////////////////////////////////////// //////////////////////////////////////////////////////////////////////// //////////////////////////////////////////////////////////////////////// //////////////////////////////////////////////////////////////////////// //////////////////////////////////////////////////////////////////////// //////////////////////////////////////////////////////////////////////// //////////////////////////////////////////////////////////////////////// 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