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Spectral Purity Checklist

Calibrate: Lime LimeUtil --cal; Pluto auto-cal on tune; prefer shared 10 MHz ref.
Digital BPF: ~3.3 MHz cutoff at 4 Msps base rate (adjust with Fs).
Device RF‑BW: ≈ 7.5 MHz; enable IQ/DC correction.
Back‑off: keep shoulders ≤ −40 dBc; verify (RBW 10–30 kHz, span 20–30 MHz).
Troubleshoot: high shoulders → steeper filter, lower gain; DC spur → LO offset + digital shift.