Free RDF software
Super Simple Sound Doppler
Lodewijk, pa3bnx developed very nice software for this.
It can plot the bearing directly on a electronic map if you want, and with GPS data it can plot and refresh your own location on the map as well.
At december 31st 2013 I spoke to Lodewijk and explained my new idea to add a elevation indicator to the RDF, based on the reduced doppler amplitude on signals with higher elevations.
I was waiting for a LED driver IC to build this addition.
http://members.chello.nl/~w.hofman/pa8w/sssd.htm
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