Return-Path: Received: (qmail 8448 invoked from network); 10 Jun 2001 22:43:51 -0000 Received: from unknown (HELO murphys-inbound.servers.plus.net) (212.159.14.225) by excalibur.plus.net with SMTP; 10 Jun 2001 22:43:51 -0000 Received: (qmail 11757 invoked from network); 10 Jun 2001 22:43:26 -0000 Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by murphys with SMTP; 10 Jun 2001 22:43:26 -0000 X-Priority: 3 X-MSMail-Priority: Normal Received: from majordom by post.thorcom.com with local (Exim 3.16 #2) id 159DrM-0002Se-00 for rsgb_lf_group-outgoing@blacksheep.org; Sun, 10 Jun 2001 23:39:04 +0100 Received: from imo-m04.mx.aol.com ([64.12.136.7]) by post.thorcom.com with esmtp (Exim 3.16 #2) id 159DrI-0002SY-00 for rsgb_lf_group@blacksheep.org; Sun, 10 Jun 2001 23:39:00 +0100 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Received: from MarkusVester@aol.com by imo-m04.mx.aol.com (mail_out_v30.22.) id l.bb.f6f11f5 (17233) for ; Sun, 10 Jun 2001 18:37:48 -0400 (EDT) From: MarkusVester@aol.com Message-ID: Date: Sun, 10 Jun 2001 18:37:47 EDT Subject: LF: Brian's SpecLab Plots To: rsgb_lf_group@blacksheep.org MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII; format=flowed Content-Transfer-Encoding: 8bit X-Mailer: AOL 4.0.i for Windows 95 sub 72 Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group Sender: Hi Brian, hi group, it looks like I've had a 1-way contact to your SpecLab recorder last night :-). I had transmitted my callsign twice on 135922.2 using 30s dots between 21:50 and 23:43 UT. Lucky enough, the opening of our path occured in that period. My signal can first be detected in your TA-plot during a noise dip around 22:05, and rising up to some 8dB SNR around 22:27. Now I understand what the funny specialties Wolf implemented in SpecLab are good for... Besides functioning as a "parrot" for testing our TXs, these spectrograms contain a wealth of information. For example, the 350mW IMP visible at 135.36 originates only 160 km northwest of me, but fades in more than half an hour later. And who or what are the carriers on 136.50 (fading) and 135.75(constant)? The strange noise bands above 137.1 seem to be a local problem, as the noise between 20:15 and 05:05 (street lights?). The long dash before 02:00 on 137.84 is something I have regularly seen here, its a DBF39-Luxembourg-IMP with some AM-broadcast audio-tone. Sometime early in the last century, amateurs invented an ingeneous realtime-propagation-check method (called a QSO). Brian, I'm looking forward to do just that... 73 de Markus, DF6NM > Dear All, > > Following the launch of two very powerful facilities in SpecLab namely: > scheduled waterfall capture and scheduled export of Xcel compatible text files > it is possible to automate a PC data logger to look at the band and to plot > the peak amplitude of various signals in various bandwidths, the frequency > of each of those peak amplitudes and the noise floor. I have implemented > such a trial scheme to look at DCF39, CFH, 136KHz, the TA slot and SXV. > The intention is that my web pages should be updated around 0700utc > each morning. There is also a bonus, since Laurie G3AQC puts a very good > signal into this location there is a slot at 135915 to 135927Hz which is > automatically plotted, so if you want to try out your transmitter feel free, > the period between points plotted is 90s so any transmission must exceed > this several times to be useful. > > The URL for SpecLab is:http://www.qsl.net/dl4yhf/spectra1.html > > My sincere thanks to Wolf DL4YHF for all his help and patience. > > 73, Brian > > 73 Brian CT1DRP IN51QD 41 09 58N 08 39 11W > http://homepage.esoterica.pt/~brian