Return-Path: Received: (qmail 1661 invoked from network); 12 Apr 2000 19:22:39 -0000 Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by redlabel.core.plus.net.uk with SMTP; 12 Apr 2000 19:22:39 -0000 Received: from majordom by post.thorcom.com with local (Exim 3.02 #1) id 12fSYY-0001jL-00 for rsgb_lf_group-outgoing@blacksheep.org; Wed, 12 Apr 2000 20:12:06 +0100 Received: from merlins.plus.net.uk ([195.166.128.23] helo=merlins.force9.net) by post.thorcom.com with smtp (Exim 3.02 #1) id 12fSYW-0001jB-00 for rsgb_lf_group@blacksheep.org; Wed, 12 Apr 2000 20:12:04 +0100 Received: (qmail 28747 invoked from network); 12 Apr 2000 19:13:46 -0000 Received: from rack.servers.plus.net.uk (212.159.2.65) by merlins.plus.net.uk with SMTP; 12 Apr 2000 19:13:46 -0000 Received: (qmail 28780 invoked from network); 12 Apr 2000 19:12:32 -0000 Received: from unknown (HELO main) (212.159.76.14) by rack.servers.plus.net.uk with SMTP; 12 Apr 2000 19:12:32 -0000 Message-ID: <009a01bfa4b3$a647fc60$0600a8c0@main> From: "Dave" To: rsgb_lf_group@blacksheep.org References: <38F422C1.A543FFD1@netscapeonline.co.uk> Subject: LF: Re: G3WSC/P acty Date: Wed, 12 Apr 2000 20:08:43 +0100 MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1; format=flowed Content-Transfer-Encoding: 8bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 5.00.2014.211 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: Eh what?? > Square wave generators/dividers and class D/E amplifiers are fine for > small antennas and low erp but NOT SUITABLE for larger antennas and high > power. An abundance of LPF and BP filters might help to clean up the > signal. I think you're getting confused with high levels of harmonic output, which class D amplifiers can suffer from if not properly filtered, and sideband energy from fast rise and fall times of the transmitted envelope. LPF will NOT help! This can happen with any kind of amplifier, I key my class D PA with a tailored rise and fall, series device. Oh, and by the way, they were using a linear amplifier! (It was a little bit clicky though...) Dave 'YXM.