Return-Path: Received: (qmail 28627 invoked from network); 16 Jan 2002 16:46:10 -0000 Received: from unknown (HELO murphys-inbound.services.quay.plus.net) (212.159.14.225) by excalibur-qfe1-smtp-plusnet.harl.plus.net with SMTP; 16 Jan 2002 16:46:10 -0000 Received: (qmail 5367 invoked from network); 16 Jan 2002 16:46:07 -0000 Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by murphys.services.quay.plus.net with SMTP; 16 Jan 2002 16:46:07 -0000 Received: from majordom by post.thorcom.com with local (Exim 3.33 #2) id 16Qt64-0007P1-00 for rsgb_lf_group-outgoing@blacksheep.org; Wed, 16 Jan 2002 16:39:32 +0000 Received: from ns2.etecsa.net ([206.49.67.1] helo=mxb.etecsa.net) by post.thorcom.com with esmtp (Exim 3.33 #2) id 16Qt62-0007Ow-00 for rsgb_lf_group@blacksheep.org; Wed, 16 Jan 2002 16:39:30 +0000 Received: (from daemon@localhost) by mxb.etecsa.net (8.8.8+Sun/8.8.8) id LAA07069 for rsgb_lf_group@blacksheep.org; Wed, 16 Jan 2002 11:38:03 -0500 (EST) Received: from ppp-inforhc.pppn.etecsa.cu(10.10.0.2), claiming to be "user" via SMTP by opcional, id smtpdAAA09j6Lz; Wed Jan 16 11:37:54 2002 Message-ID: <00e501c19ea3$ce657ce0$02000a0a@user> From: "Prof. Arnaldo Coro Antich" To: rsgb_lf_group@blacksheep.org References: <5.1.0.14.0.20020116102434.00a7a7f8@gemini.herts.ac.uk> <3C458059.44CF7601@usa.net> Subject: LF: Re: Re: G3YXM's Jason test sigs Date: Wed, 16 Jan 2002 10:10:49 -0400 Organization: ICRT Radio Habana Cuba MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1; format=flowed X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 5.50.4807.1700 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from 8bit to quoted-printable by mxb.etecsa.net id LAA07069 Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group Sender: Just downloaded JASON, but my machine does not seem to be able to handle it... It is Pentium II running at 366 mHz Celeron CPU with 128 megs of RAM Any ideas ? After going trough the conceptual approach or Señor Alberto 's JASON program, I want to congratulate him for such a wonderfully well thought approach to weak signal work !!! As a VHF enthusiast I foresee very interesting applications for JASON in that area too ... 73 and DX Arnie Coro CO2KK Host of Dxers Unlimited Radio Havana Cuba's radio hobby program ----- Original Message ----- From: "Alberto di Bene" To: Sent: miércoles, 16 de enero de 2002 9:30 Subject: LF: Re: G3YXM's Jason test sigs > James Moritz wrote: > > > If the centre frequency is > > F, and the spacing between tones is f, the possible tone frequencies are F > > +/- (n-0.5)*f where n is an integer from 1...16. Therefore there are 32 > > possible equally-spaced tone frequencies from F-15.5f to F+15.5f. Is this > > correct? > > > > Hi Jim and the group, > > yes, correct, that's how the information is encoded in Jason. > There is another possible format, which has pros and cons. > It has been also suggested by Stewart Nelson. I had initially, > when designing Jason, dismissed it, but now I am here asking > your collective opinion. > > Presently only the absolute value of the frequency delta is used > to encode the information. If I use also the sign, I have this results : > > -Pros The band occupied is nearly halved, from 32 slots, it goes > down to 17 slots. > > -Cons The system is no more sideband independent. Now it is > immaterial whether the RX is set to LSB or USB. > This would not be any more the case with the alternate scheme. > > So, what would all you judge more important, sideband independence, > or bandwidth used ? Your vote will decide the final format for Jason. > > 73 Alberto I2PHD > > >