Documentally - First, apologies for my late reply. I agree with ReadyKilowatt that the Kraken SDR is THE system for Automatic Direction Finding as it is completely solid state, computing the direction of a transmission entirely via computation which (as I understand it, is about as good as it can get).
There is also a small unit that electronically rotated a series of antennas and used a receiver. I have one (purchased on impulse at a Hamvention years ago, but I've never taken the time to put it to use). I also found some references to Automatic Direction Finding work by WA2EBY, and later work by PA8W - https://radiodirectionfinding.wordpress.com/
Cheers :-)
Documentally - First, apologies for my late reply. I agree with ReadyKilowatt that the Kraken SDR is THE system for Automatic Direction Finding as it is completely solid state, computing the direction of a transmission entirely via computation which (as I understand it, is about as good as it can get).
There is also a small unit that electronically rotated a series of antennas and used a receiver. I have one (purchased on impulse at a Hamvention years ago, but I've never taken the time to put it to use). I also found some references to Automatic Direction Finding work by WA2EBY, and later work by PA8W - https://radiodirectionfinding.wordpress.com/
Cheers for the link!