Return-Path: Received: (qmail 8515 invoked from network); 16 Feb 2002 17:55:24 -0000 Received: from unknown (HELO warrior.services.quay.plus.net) (212.159.14.227) by exhibition.plus.net with SMTP; 16 Feb 2002 17:55:24 -0000 Received: (qmail 4505 invoked from network); 16 Feb 2002 17:55:21 -0000 Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by warrior.services.quay.plus.net with SMTP; 16 Feb 2002 17:55:21 -0000 Received: from majordom by post.thorcom.com with local (Exim 3.33 #2) id 16cAUu-0000SP-00 for rsgb_lf_group-outgoing@blacksheep.org; Sat, 16 Feb 2002 19:27:48 +0000 Received: from phobos.unica.co.uk ([208.239.240.147]) by post.thorcom.com with esmtp (Exim 3.33 #2) id 16cAUs-0000SB-00 for rsgb_lf_group@blacksheep.org; Sat, 16 Feb 2002 19:27:47 +0000 Received: from [212.1.130.1] (helo=smtp-1.visp.telinco.net) by phobos.unica.co.uk with esmtp (Exim 3.13 #2) id 16c8vj-0004RC-00 for rsgb_lf_group@blacksheep.org; Sat, 16 Feb 2002 12:47:23 -0500 Received: from [212.1.159.107] (helo=g4jnt) by smtp-1.visp.telinco.net with smtp (Exim 3.32 #1) id 16c8gt-0005Eg-00 for rsgb_lf_group@blacksheep.org; Sat, 16 Feb 2002 17:32:03 +0000 Message-ID: <000d01c1b711$5b68b3c0$6b9f01d4@g4jnt> From: "Andrew Talbot" To: rsgb_lf_group@blacksheep.org Subject: LF: Re: Re: G4JNT "PSK CW" transmission/ Phase display Date: Sat, 16 Feb 2002 17:42:48 -0000 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 4.72.3110.1 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: Jim , Great !!!!!!! I didn't think anyone would actually build one ! Now you need a way to do the arctan function in hardware. Or, thinking laterally, a servo loop off the Q channel driving a phase shifter. I'll put out another transmission during the week sometime. Monday is not possible as I go off to my Camera Club then, but lets say provisionally Tuesday 1900.00z Andy -----Original Message----- From: James Moritz To: rsgb_lf_group@blacksheep.org Date: 16 February 2002 16:37 Subject: LF: Re: G4JNT "PSK CW" transmission/ Phase display >Dear Andy, LF group, > >I had a few problems with corrupted downloads of Wolf's SpecLab software, >so was not able to use it to decode G4JNT's PSK signal last night - >however, it was easy to copy the "G4JNT PSK CW"message using the phase >transitions visible on the spectrogram as before. > >While I was hanging around, I thought it would be fun to follow Andy's >suggestion and build a breadboard hardware vector display to use with an >oscilloscope - unfortunately, Andy had gone QRT by the time it was working, >but it was certainly interesting to look at other LF signals in this way. >The phase jumps on DCF39 are clearly seen. With a wider bandwidth, you can >observe the phase modulation on the Radio 4 198kHz signal. The French >station on 162kHz has something similar, but with rather greater phase >deviation. Atlantic 252 is a couple of Hz low in frequency, and the phase >has a funny little wobble. GBR on 15.98kHz is particularly intriguing and >quite hypnotic - the phase of the MSK signal is changing all the time, the >symbols appear to be represented by changes in the direction of the phase >shift from increasing to decreasing or vice-versa, which occur at fixed >points on the phase circle. I'll definitely have to build it up more >permanently... > >Cheers, Jim Moritz >73 de M0BMU > > >