You'll have to solder the SMA connector and figure out the calibration details yourself, but this board works great if you don't mind putting a little more effort into it than the more expensive one. The board selection "MMDVM_HS_Hat (DB9MAT and DF2ET) for Pi (GPIO)" in Pi-Star helped me. I found it more fun figuring things out than buying a better documented and fully assembled unit, but if you're into plug and play then this probably isn't the board you're looking for.
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