Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on lipkowski.org X-Spam-Level: X-Spam-Status: No, score=-2.3 required=5.0 tests=FREEMAIL_FORGED_FROMDOMAIN, FREEMAIL_FROM,HEADER_FROM_DIFFERENT_DOMAINS,RCVD_IN_DNSWL_MED,SPF_PASS, T_DKIM_INVALID 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 v3SGI03b023617 for ; Fri, 28 Apr 2017 18:18:02 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1d48Wk-0000E2-KB for rs_out_1@blacksheep.org; Fri, 28 Apr 2017 17:13:50 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1d48Wk-0000Ds-2U for rsgb_lf_group@blacksheep.org; Fri, 28 Apr 2017 17:13:50 +0100 Received: from mail-wm0-x22d.google.com ([2a00:1450:400c:c09::22d]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.89) (envelope-from ) id 1d48Wh-0005fd-8e for rsgb_lf_group@blacksheep.org; Fri, 28 Apr 2017 17:13:48 +0100 Received: by mail-wm0-x22d.google.com with SMTP id u65so46423414wmu.1 for ; Fri, 28 Apr 2017 09:13:47 -0700 (PDT) X-DKIM-Result: Domain=gmail.com Result=Good and Known Domain DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:date:message-id:to:subject:in-reply-to:references:mime-version :content-transfer-encoding; bh=WhiG9VXXj8Ns5DDT2VepZjDUQwRtDbWw5WR3Bg5xNBA=; b=l8fOd4jH8Ku32aVV7y/fqsrAe4mOJU3QjMKjaLWBSc8bHEP3RQlKw9Gs5irQFuv1fW LGmtSAe0Mb7gDfFFc7eiiEetUctI57Kw1Qie3uCYvGAvixzIm7ryY/Pl17nv94zKfn5V gjlFV++R7fQJV/RtKk4XbibOlE35xW08OAc9xRnYuGPwAThTT9GQ3UBd66vUp1392egL 5GJ1f5QXLjTj41nEqPPXzl1+VHUJ70gttAvyc9hx30ZOybJpws96VpK4FD+JKoJEREl/ A710PXGKcooBKGlpKSQDLKkBTAt7DUUKleT9EH0PgFRiQ84aAu+kLwkWl9YLciO1Ii/4 oMmA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:date:message-id:to:subject:in-reply-to :references:mime-version:content-transfer-encoding; bh=WhiG9VXXj8Ns5DDT2VepZjDUQwRtDbWw5WR3Bg5xNBA=; b=uJNwP+hRhG8BXJfhD+r7HsnXDOyy/sv1E+W+kgEV4wDzRTFJyupDOl8z+kRq6plS+u d7l6Tw7KX0QYwWAeHkJabEDF4qxH2SAX/28ps8hCqchT/o6JS/WZJoS+2vU970I28QEj AGnqSHFHyFbEPqRhnNkZOhBC9ouhpfOnEuZ1KRJ7KbFeu3SNQWo5bjBvg1GEgax3SZAX uSFpB3QBtKTSXf3oqtgEkPBIw/ku7VD+7+GWFwL4QRvMg0QQQKIxjvfXwzCmEy9N3YxH cF5Pi33UL7VzlrVaxWoMxWDRcElGidn10t241fm8FkJxzpp0Cj4PwGiZ7SZXcHDyGcpm 0S7A== X-Gm-Message-State: AN3rC/4WkEIhSZvpR11RtJJ6ap8tIVTZv/Ws5CwckHOl3CXtupjov+ay WFsY1xSDXoK+BfC9 X-Received: by 10.28.20.84 with SMTP id 81mr6518476wmu.51.1493396026330; Fri, 28 Apr 2017 09:13:46 -0700 (PDT) Received: from OfficeWin7.lan (82-70-254-222.dsl.in-addr.zen.co.uk. [82.70.254.222]) by smtp.gmail.com with ESMTPSA id f2sm7131614wmh.27.2017.04.28.09.13.45 for (version=TLS1 cipher=AES128-SHA bits=128/128); Fri, 28 Apr 2017 09:13:45 -0700 (PDT) From: Chris Wilson X-Google-Original-From: Chris Wilson Date: Fri, 28 Apr 2017 17:13:44 +0100 X-Priority: 3 (Normal) Message-ID: <1689362508.20170428171344@gmail.com> To: rsgb_lf_group@blacksheep.org In-Reply-To: <016E39748BC547AF82FF637F331B912D@DELL4> References: <15b946bf359.marcocadeddu@tin.it> <5dfe6b21-f2aa-d0d1-2d3e-b38d728fa988@t-online.de> <1123583766.20170424174909@gmail.com> <016E39748BC547AF82FF637F331B912D@DELL4> MIME-Version: 1.0 X-Scan-Signature: e90dcb17768c7e768f13e0721cc1c0c7 Subject: Re: R: LF: Dummy load testing without LPF? Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit 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: 11508 Hello Jay, Yes, this is what I found, I'm learning, slowly and appreciate the explanation, all the best. > Chris > As Markus aptly pointed out in the combiner discussion, VMCD > (Voltage Mode Class D) attempts to > produce a square wave voltage waveform. Terminating with a 50 ohm resistor is not the same as > terminating with a T-type LPF ... which has the desired rising input impedance with frequency. > Jay W1VD WD2XNS WE2XGR/2 -- Best regards, Chris mailto:dead_fets@gmail.com