[450] ADS-B receiver

[David McKenzie]

After a few days logging ADS-B and mode-s transponders from aircraft
overhead here's how it hears. The antenna is in the attic directly
conencted to an "airspy mini" sdr dongle (99 bux, 6ish MHz bandwidth
very nice, rx only). It's a homebrew colinear made out of 11cm sticks of
rg58.


https://i.sli.mg/jpLLLM.png

https://i.sli.mg/SqYRri.png

The range circles are 20 miles each, red is 30,000ft+, purple is
20k-30k, dark green is 10-20k and light green is under 10k. From inside
the attic it can pretty much hear every takeoff and landing at oxford
but I lose planes into bradley under about 4000 feet.