Return-Path: Received: (qmail 19317 invoked from network); 19 Dec 2002 19:00:04 -0000 Received: from warrior.services.quay.plus.net (212.159.14.227) by mailstore with SMTP; 19 Dec 2002 19:00:04 -0000 Content-Transfer-Encoding: 8bit Received: (qmail 8842 invoked from network); 19 Dec 2002 19:00:02 -0000 X-Priority: 3 X-MSMail-Priority: Normal Received: from post.thorcom.com (193.82.116.70) by warrior.services.quay.plus.net with SMTP; 19 Dec 2002 19:00:02 -0000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 X-SQ: A Received: from majordom by post.thorcom.com with local (Exim 4.10) id 18P5su-0000J3-00 for rsgb_lf_group-outgoing@blacksheep.org; Thu, 19 Dec 2002 18:59:04 +0000 Received: from [147.197.200.9] (helo=hestia.herts.ac.uk) by post.thorcom.com with esmtp (Exim 4.10) id 18P5st-0000Iu-00 for rsgb_lf_group@blacksheep.org; Thu, 19 Dec 2002 18:59:03 +0000 Received: from gemini ([147.197.200.44] helo=gemini.herts.ac.uk) by hestia.herts.ac.uk with esmtp (Exim 3.22 #1) id 18P5sn-0001tg-00 for rsgb_lf_group@blacksheep.org; Thu, 19 Dec 2002 18:58:57 +0000 Received: from [147.197.232.252] (helo=rsch-15.herts.ac.uk) by gemini.herts.ac.uk with esmtp (Exim 3.33 #1) id 18P5sc-0005yG-00 for rsgb_lf_group@blacksheep.org; Thu, 19 Dec 2002 18:58:46 +0000 Message-ID: <5.1.0.14.0.20021219125141.00b04bb8@gemini.herts.ac.uk> X-Sender: mj9ar@gemini.herts.ac.uk (Unverified) X-Mailer: QUALCOMM Windows Eudora Version 5.1 Date: Thu, 19 Dec 2002 18:52:26 +0000 To: rsgb_lf_group@blacksheep.org From: "James Moritz" In-reply-to: MIME-Version: 1.0 X-MailScanner: No Virus detected Subject: Re: LF: LF GDO Content-Type: text/plain; charset=us-ascii; format=flowed X-Spam-Status: No, hits=-0.2 required=5.0tests=DEAR_SOMEBODY,IN_REP_TO,SPAM_PHRASE_01_02version=2.42 Sender: Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group Dear Gary, LF Group, At 18:51 18/12/2002 +0000, you wrote: >I tried monitoring but did not receive anything intelligable, may be I >require more tries to get it right ?? as I am not sure of the best method of >setting up the receiver frequency etc for use with JASON. Any advice gents ? First, use the "options" menu to set Jason up to match your receiver - if you are using USB, set Jason to USB receive; if you are using LSB, set Jason to LSB. Set the Jason receive centre frequency to be equal to the RX BFO offset - it defaults to 800Hz. Set the RX gain and/or PC volume control to produce about 1/3 full scale on the bar graph at the left of the Jason screen with the normal signal/noise level at the RX output. The only other thing is making sure the received frequency is correct. It needs to be within about +/- 1Hz to guarantee not missing any part of the signal. Typical amateur-type synthesised receivers will probably be within a couple of Hz of nominal frequency at LF - the PC sound card may add several Hz more error. To calibrate out both these errors, set Jason to receive, and tune to a known carrier signal close to the 136k band - DCF39 on 138.830kHz should do. This should produce a clear line on the waterfall display (in between the data bursts, anyway). If this is not centered between the yellow cursor lines, click on the signal trace, and Jason should adjust it's centre frequency automatically. Then leave all the software settings as they are, and re-tune the RX to the Jason signal frequency - it should now work :-) If the Jason signal is strong enough to be clearly visible on the waterfall display, you can skip the calibration step and click on the centre of the visible trace to set the frequency correctly. Not sure what your QTH is, Gary, but I imagine it should also be easy to hear my signal, which sounds like a steady carrier with very slight frequency shifts. Cheers, Jim Moritz 73 de M0BMU