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 v3RDx3rw012924 for ; Thu, 27 Apr 2017 15:59:04 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1d3jt3-0007L1-CE for rs_out_1@blacksheep.org; Thu, 27 Apr 2017 14:55:13 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1d3jt1-0007Ks-84 for rsgb_lf_group@blacksheep.org; Thu, 27 Apr 2017 14:55:11 +0100 Received: from mail-wm0-x22c.google.com ([2a00:1450:400c:c09::22c]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.89) (envelope-from ) id 1d3jsy-0002Qz-5I for rsgb_lf_group@blacksheep.org; Thu, 27 Apr 2017 14:55:09 +0100 Received: by mail-wm0-x22c.google.com with SMTP id u65so17525509wmu.1 for ; Thu, 27 Apr 2017 06:55:07 -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=bhjudSZwx1ZruiKelWlVlXT/AjTh64/rxl7VN+7Sh6M=; b=ACX3wlujyNSM0TwOxV0dtHS3C8cYxypphIB2WVw8pqbGUKlE0FOxf7iGuoKvt4RDb0 YFCYx/RvtGE9zg5MASSu9ZggHrHP6dOOiWczkycCbRBWw0E/Kv0R3bgvY0TmXbAQj2E6 m2RpQ09nRHqQTYYBwv4X+9wtPDKzYeWcxciFNdJbbuzCx6ApfyqLBHVlTTEq1Nz2Ii4G O2lKd8+ieOSMSnwxJlJZqIqIPgixZpxLVSYvZQk90rpFv+pBF5kFSrK3G2ZAVwi7gjWd ZsacCJI5MN7QNTKVz9//UbGBoGyq5ztIvmwTCXzc1iu18LW7N3f+Qdss7gqsaTkUb4JS 9kzA== 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=bhjudSZwx1ZruiKelWlVlXT/AjTh64/rxl7VN+7Sh6M=; b=aDrxT/UcN1naAGe5+VhITCHs+hFw1NZwZu1Wm+1vq07aXfYwdoSflLqtJ7SnVvOdbZ sQ6WBAJcn7IkiL0fxd87LcntB98bACNwtAcVYjTkWhuXkqrvVakQio/dlic/WZu4jasM 1h/YkyOOiHickKD+D3gb2bhueyvwX1vXnQv+piZrUU4yNdINlHyvmlSRmInurwqTtnQt AnkqEYcHwxDB6PkALxP5xp8KzwfEl4Y+eWaJxnhW6+UHSPkJyBlus5yL1vJpdAibeRtE aeMmhtwIahOOT1zHFU0CmtmKdezPcoqQ96IQyzGACqziYnKLobW5WbdTBZVlbE6us5q1 NgEA== X-Gm-Message-State: AN3rC/7B5vofomr8Aj1Y65I5tTK8bVufPbKY4GjUEdl3GYQobXqBaxgL faxmZLBx3LotvMKT X-Received: by 10.28.144.10 with SMTP id s10mr2409233wmd.89.1493301306706; Thu, 27 Apr 2017 06:55:06 -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 x64sm3275756wrb.10.2017.04.27.06.55.05 for (version=TLS1 cipher=AES128-SHA bits=128/128); Thu, 27 Apr 2017 06:55:06 -0700 (PDT) From: Chris Wilson X-Google-Original-From: Chris Wilson Date: Thu, 27 Apr 2017 14:55:04 +0100 X-Priority: 3 (Normal) Message-ID: <1601994303.20170427145504@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: 5c1f37c04fc013ebbc2288fd3791d043 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: 11491 Hello Jay, Thanks for your and the other replies. Testing shows this is exactly the case and I have learnt something else with this, appreciated! > 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