A swept spectrum analyzer with a realistic noise floor, RBW filter skirts, LO phase noise and its own distortion, plus a tracking generator, EMI limit line, channel power, OBW and ACPR. Pick a signal, then find and measure it, or take a challenge.
Max safe input: +30 dBm with ≥ 10 dB attenuation, +20 dBm below that.
Normalizing subtracts the cables' own loss so the trace shows only the DUT.