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</o:shapelayout></xml><![endif]--></head><body lang=DE link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Thanks a lot – very interesting!<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Ralph.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><div style='border:none;border-left:solid blue 1.5pt;padding:0cm 0cm 0cm 4.0pt'><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm'><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> Sylvain AZARIAN [mailto:sylvain.azarian@gmail.com] <br><b>Sent:</b> Sunday, February 09, 2014 8:55 PM<br><b>To:</b> David Jacobowitz<br><b>Cc:</b> jdow; Sylvain Munaut; osmocom-sdr@lists.osmocom.org; Ralph A. Schmid, dk5ras<br><b>Subject:</b> Re: odd results working at 250ksp/s<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><div><p class=MsoNormal>Hi,<o:p></o:p></p><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>With a lot of delay and my apologizes, as promised a while ago, I finally published some quick notes on the VOR signal today.<o:p></o:p></p></div><div><p class=MsoNormal>The complete signal analysis as been posted on my blog at this page : <a href="http://www.f4gkr.org/2014/02/in-depth-study-of-the-vor-signals/">http://www.f4gkr.org/2014/02/in-depth-study-of-the-vor-signals/</a><o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>I need to save the recorded WAV signals somewhere so people interested in good SNR recordings would get it.<o:p></o:p></p></div><div><p class=MsoNormal>I decided to return close to the nearby VOR transmitter (Rambouillet, south west Paris) and put the RTL SDR on my car rooftop and turn on the laptop to capture some signals... <o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>Best regards<o:p></o:p></p></div><div><p class=MsoNormal>sylvain F4GKR<o:p></o:p></p></div></div><div><p class=MsoNormal style='margin-bottom:12.0pt'><o:p> </o:p></p><div><p class=MsoNormal>2013-10-22 17:07 GMT+02:00 David Jacobowitz <<a href="mailto:david.jacobowitz@gmail.com" target="_blank">david.jacobowitz@gmail.com</a>>:<o:p></o:p></p><div><p class=MsoNormal>I originally posted about 115.8 and 116.8 MHz, both square in the VOR band of 108 to 117.95. I might have sent something else in a PM, but if so it was a typo. :-) I am definitely only interested in the VOR band right now -- though, as you say, it is adjacent to commercial FM with its high power.<o:p></o:p></p><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>My application is simple in concept: A fully auomatic VOR-based positioning system, a fallback from GPS. I want to scan the entire VOR band, looking for signals in the standard VOR format that can be demodulated. I do the initial scan with a fast sample rate and FFT, just looking for peaks. From those, I examine the signals to see if it looks like a VOR signal. From that list, I will "park" on each signal long enough (~30s) to decode the VOR's morse code station ID.