SDR that was able to display signals coming from diff directiondifferent colors?

• SDR that was able to display signals coming from diff directiondifferent colors?
  Posted by cdev on 23 May, 2017 22:49
• I vaguely remember seeing this a few years ago. Somebody had made a build of some SDR software that they modified to work with a multi-input receiver or specialized antenna array? Multiple receivers?
  
  anyway it was a demonstrated working system that could in realtime not just determine the direction the signal was coming from but also display it in different colors in the waterfall, the waterfall was colored with the directions of different signals- visualized in color, in realtime.
  
  I am sure I bookmarked and saved it but now cant find it. Does anybody know what I am talking about, or where it can be found? Seems like a cool project.
• #1 Reply
  Posted by hendorog on 23 May, 2017 22:57
• Not sure if this is it, but I remember seeing this a while back which sounds similar:
  
  http://www.rtl-sdr.com/building-a-passive-radar-system-with-an-rtl-sdr/
• #2 Reply
  Posted by cdev on 23 May, 2017 23:32
• No, that's not the thing I was referring to,
   (Still that experimenters underlying technique of running multiple dongles off a single crystal oscillator is a great idea)
  
  
• #3 Reply
  Posted by piranha32 on 24 May, 2017 02:57
• Maybe this one?
  http://df6nm.de/ColourDF/ColourDF.htm
• #4 Reply
  Posted by cdev on 25 May, 2017 04:33
• Thats it, thank you! Isn't the idea pretty neat!
• #5 Reply
  Posted by jpanhalt on 25 May, 2017 04:49
• That method of using the phase relation of an E-field antenna to resolve the 180° ambiguity inherent in crossed loop H-field antennas has been used in ADF for many years (https://en.wikipedia.org/wiki/Radio_direction_finder#Automatic_direction_finder_.28ADF.29).
  
  Neat to see it applied to SDR receivers.
  
  John