Return-Path: Received: (qmail 25303 invoked from network); 1 Feb 2000 22:37:45 -0000 Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by redlabel.core.plus.net.uk with SMTP; 1 Feb 2000 22:37:45 -0000 Received: from majordom by post.thorcom.com with local (Exim 3.02 #1) id 12Flo3-00008W-00 for rsgb_lf_group-outgoing@blacksheep.org; Tue, 01 Feb 2000 22:29:55 +0000 Content-Type: text/plain; charset=iso-8859-1; format=flowed Content-Transfer-Encoding: 8bit Received: from anchor-post-31.mail.demon.net ([194.217.242.89]) by post.thorcom.com with esmtp (Exim 3.02 #1) id 12Flo2-00008R-00 for rsgb_lf_group@blacksheep.org; Tue, 01 Feb 2000 22:29:55 +0000 X-Priority: 3 Received: from pickmere.demon.co.uk ([158.152.117.143]) by anchor-post-31.mail.demon.net with smtp (Exim 2.12 #1) id 12Flnx-000Iqy-0V for rsgb_lf_group@blacksheep.org; Tue, 1 Feb 2000 22:29:49 +0000 X-MSMail-Priority: Normal Message-ID: Date: Tue, 1 Feb 2000 19:53:06 +0000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 To: rsgb_lf_group@blacksheep.org From: "M.J.Powell" Subject: Re: LF: 73kHz Today References: <15836.200002011714@gemini><3.0.2.32.20000201194925.006d969c@aurora.eexi.gr> In-reply-to: <3.0.2.32.20000201194925.006d969c@aurora.eexi.gr> MIME-Version: 1.0 X-Mailer: Turnpike Integrated Version 4.02 S Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group Sender: In message <3.0.2.32.20000201194925.006d969c@aurora.eexi.gr>, Costas Krallis writes >At 15:26 01/02/2000 +0000, you wrote: > >> I would guess that the sidebands are due to power supply ripple, >> and that when FSK modulation is on, all the sidebands get >> modulated too. Since the data is probably not syncronised with the >> mains, the end result is the amazing racket we are used to. > >>From the symptoms you describe, I agree with your diagnosis. >It is definitely a power supply problem, possibly caused by >faulty filter capacitors. OK. Who is going to write to them? Mike -- M.J.Powell