Return-Path: Received: (qmail 7546 invoked from network); 17 Apr 2001 08:07:28 -0000 Received: from unknown (HELO murphys-inbound.servers.plus.net) (212.159.14.225) by 10.226.25.101 with SMTP; 17 Apr 2001 08:07:28 -0000 Received: (qmail 20089 invoked from network); 17 Apr 2001 08:07:09 -0000 Content-Transfer-Encoding: 8bit Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by murphys with SMTP; 17 Apr 2001 08:07:09 -0000 X-Priority: 3 X-MSMail-Priority: Normal Received: from majordom by post.thorcom.com with local (Exim 3.16 #2) id 14pQN0-000111-00 for rsgb_lf_group-outgoing@blacksheep.org; Tue, 17 Apr 2001 08:57:54 +0100 Received: from mail.cc.kuleuven.ac.be ([134.58.10.6]) by post.thorcom.com with esmtp (Exim 3.16 #2) id 14pQMw-00010w-00 for rsgb_lf_group@blacksheep.org; Tue, 17 Apr 2001 08:57:50 +0100 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Received: from LCBD15.fys.kuleuven.ac.be (LCBD15.fys.kuleuven.ac.be [134.58.80.15]) by mail.cc.kuleuven.ac.be (8.9.3/8.9.0) with SMTP id JAA935310 for ; Tue, 17 Apr 2001 09:57:23 +0200 Message-ID: <3.0.1.16.20010417085847.2c8f50ea@mail.cc.kuleuven.ac.be> X-Sender: pb623250@mail.cc.kuleuven.ac.be X-Mailer: Windows Eudora Pro Version 3.0.1 (16) Date: Tue, 17 Apr 2001 08:58:47 To: rsgb_lf_group@blacksheep.org From: "Rik Strobbe" Subject: Re: LF: WOLF bandwidth suggestions In-reply-to: <63.14878f3e.28088e1e@aol.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group Sender: Hi Marcus & group, >1. WOLF is using cosine-shaped zero-crossings with a risetime of only 5 ms, >which causes a few extra sidebands on each side of the spectrum. I'd prefer >to extend the cosine-envelope to the full symbol duration (like in PSK31), >then ideally only the 10 Hz wide main spectral lobe would persist. At a given >PEP level and with 50% phase transitions, on average we'd lose only 0.8 dB >SNR while saving 24% transmitted energy. You are right about the average value, but for a '0101' sequence the signal will be 3dB down. And as it is of very little use if you can decode sequences like '111000111' but you cannot decode a '010101010' sequence I believe that that the effective loss of SNR is 3dB, even if the average power is only 0.8dB down. 73, Rik ON7YD