Just received my LimeSDR-Mini 1 week ago:
- GNU Radio 3.8
- Ubuntu 20.04
- With GNU Radio Flowgraph BPSK transmit, received spectrum seems distorted and bits not recovered - Spectrum as follows on transmit and receive to compare (Frequency sink before Lime Tx block is bottom spectrum in Figure). Flowgraph as follows below also:
- FM transmit and receive worked on another flowgraph well enough to hear wav file, BPSK flowgraph booted with lime with no issues noted, and LimeQuickTest passed. Transmit spectrum on Pluto Receive looked distorted/same too when lime transmitted to it.
- 20 dB attenuator used in loop, many gain levels, saturation checked, RF loop cable disconnected and reconnected to verify receive signal above noise floor, 10 minute increments of testing only to keep lime board temperature low, tried many frequencies - sometimes transmit frequency same as receive frequency and sometimes not (offset with NCO parameter).
Assuming no mistake in setup, is there a gr-limesdr block 3.8 branch issue maybe where the “Cal” on limesdr-mini board is not occurring well when directed by gnu radio flowgraph?
Seems like limeboard is OK, but maybe it is not calibrating well when controlled via a gr-limesdr block in gnu radio 3.8?