A few notes to anyone else having issues with noise and instability:
After playing with Hack RF for about a week, I have found that
1) Placing the HackRF unit on top of a computer adds so much noise it
cant receive much of anything. Place the HackRF unit as far from the
computer as the USB cable permits. For about a day I couldn't figure out
why I could not receive FM stations with gnuradio-companion even though
everything seemed fine.
2) Particularly in the GHz bands, even simple shielding makes a huge
difference. I covered my unit with aluminum foil (which I clipped to one
of the clock SMA connector to ground it) and performance improved
dramatically. I am going to try the NooElec enclosure kit and RF Shield
and how well they work.
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