Return-Path: Received: (qmail 14051 invoked from network); 13 Apr 2001 00:02:19 -0000 Received: from unknown (HELO murphys-inbound.servers.plus.net) (212.159.14.225) by excalibur.plus.net with SMTP; 13 Apr 2001 00:02:19 -0000 Received: (qmail 2607 invoked from network); 13 Apr 2001 00:02:15 -0000 Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by murphys with SMTP; 13 Apr 2001 00:02:15 -0000 Received: from majordom by post.thorcom.com with local (Exim 3.16 #2) id 14nqxA-0005yp-00 for rsgb_lf_group-outgoing@blacksheep.org; Fri, 13 Apr 2001 00:56:44 +0100 Received: from tungsten.btinternet.com ([194.73.73.81]) by post.thorcom.com with esmtp (Exim 3.16 #2) id 14nqx8-0005yj-00 for rsgb_lf_group@blacksheep.org; Fri, 13 Apr 2001 00:56:42 +0100 Received: from [62.7.63.27] (helo=default) by tungsten.btinternet.com with smtp (Exim 3.03 #83) id 14nqwf-0003kO-00 for rsgb_lf_group@blacksheep.org; Fri, 13 Apr 2001 00:56:13 +0100 Message-ID: <002001c0c3ab$e4b58860$1b3f073e@default> From: "Alan Melia" To: "LF-Group" Subject: LF: diplexer ....more Date: Fri, 13 Apr 2001 00:36:29 +0100 MIME-Version: 1.0 Content-Type: multipart/mixed; boundary="------------060409060401020302090005" 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. --------------060409060401020302090005 Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 8bit Hi all, thanks to Jim and Bob for their comments. Yes Jim I was worried about the little jiggle I saw when I simulated a 'tuned' antenna on the end, but my thought was that it was at least at the wanted frequency. To Bob, I think the efficiency of the PA is only high if you calculate the input power to the 'total' output power (wideband), the harmonic power doesnt 'improve your QSO getting potential' surely as its in the BC band in Europe!! Isn't it the case that the harmonic power is not reflected back to the the PA , where it could cause trouble but the input to the diplexer can still be a square wave, giving high efficiency in terms of the heat generated on the heatsink. (or am I up the wrong tree ??) The suggestion (from Dick ) was that the PA instability on tuning up the aerial may have been caused by the response of the aerial to the harmonics in the square waveform. I suppose if the PA is unconditionaly stable (like the Class A circuits) it doesnt matter too much. I have run another calculation based on 200kHz cross-over which will avoid the problem I think that Jim saw. (GIF file attached....note these values were not simulated yet so check that they bear a constant ratio ...200/160 ....to the 160kHz crossover values before spending a lot of time winding coils!) The point I can't quite get a handle on is " would the tuning wierdies be worse with the harmonics successfully absorbed, than with a straight LP filter" I think the best solution to that one may be the "suck it and see test". Certainly the response of the diplexer input at the harmonic looks 'benign'. Cheers de Alan G3NYK Alan.Melia@btinternet.com --------------060409060401020302090005 Content-Type: image/gif; name="LFDIPLEX.gif" Content-Transfer-Encoding: base64 Content-Disposition: inline; filename="LFDIPLEX.gif" R0lGODdhMgJGAfcAAAAAAP////////////////////////////////////////////////// //////////////////////////////////////////////////////////////////////// //////////////////////////////////////////////////////////////////////// //////////////////////////////////////////////////////////////////////// //////////////////////////////////////////////////////////////////////// //////////////////////////////////////////////////////////////////////// //////////////////////////////////////////////////////////////////////// //////////////////////////////////////////////////////////////////////// //////////////////////////////////////////////////////////////////////// //////////////////////////////////////////////////////////////////////// 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