Return-Path: Received: (qmail 18383 invoked from network); 18 Apr 2001 15:49:16 -0000 Received: from unknown (HELO warrior-inbound.servers.plus.net) (212.159.14.227) by excalibur.plus.net with SMTP; 18 Apr 2001 15:49:16 -0000 Received: (qmail 12147 invoked from network); 18 Apr 2001 15:48:57 -0000 Content-Transfer-Encoding: 8bit Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by warrior with SMTP; 18 Apr 2001 15:48:57 -0000 X-Priority: 3 Received: from majordom by post.thorcom.com with local (Exim 3.16 #2) id 14pu3o-0004oP-00 for rsgb_lf_group-outgoing@blacksheep.org; Wed, 18 Apr 2001 16:40:04 +0100 X-MSMail-Priority: Normal Received: from mail.cc.kuleuven.ac.be ([134.58.10.6]) by post.thorcom.com with esmtp (Exim 3.16 #2) id 14pu3k-0004nx-00 for rsgb_lf_group@blacksheep.org; Wed, 18 Apr 2001 16:40:00 +0100 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 RAA830702 for ; Wed, 18 Apr 2001 17:39:32 +0200 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Message-ID: <3.0.1.16.20010418164055.3e37ae9a@mail.cc.kuleuven.ac.be> X-Sender: pb623250@mail.cc.kuleuven.ac.be X-Mailer: Windows Eudora Pro Version 3.0.1 (16) Date: Wed, 18 Apr 2001 16:40:55 To: rsgb_lf_group@blacksheep.org From: "Rik Strobbe" Subject: LF: (b)psk signal bandwidths In-reply-to: <003e01c0c800$0d3eab60$0700000a@parissn2> References: <3.0.1.16.20010418112245.218f3f10@mail.cc.kuleuven.ac.be> 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: Hello, Last night I took some more spectra of (b)psk signal and put the results on my webpage, have a look at : http://www.qsl.net/on7yd/PSK_TEST/psk_test.htm Besides the BPSK and PSK signals I also measured a 12WPM CW signal (as reference) and 3 different 'gradual' PSK signals, one with a gradual phase shift over 100ms (= 100% of a bitlength), one with a gradual phase shift over 50ms (= 50% of the bitlength) and one with a gradual phase shift over 25ms (= 25% of the bitlength). For better understanding I further added the amplitude/time and phase/time diagrams for each of the signals. >From this measurements it is clear that PSK has the smallest bandwidth, slighty worse is gradual PSK with 100ms transient time. But gradual PSK with 50ms transient time has a quite acceptable bandwidth and even gradual PSk with 25ms transient time is still better than 12WPM CW. BPSK seems to have all the 'ingredients' needed to fill a significant part of the band with rubbish. 73, Rik ON7YD