These devices have very good parameters. We include support of 4051 into our software RadioInspector.
These SAs support IQ streaming for digital analysis and with our DTest option we can demodulate digital standards like TETRA, P25, DMR and analog TV.
More over we can demodulate headers of packets of following standards: GSM, DECT, Bluetooth, ZigBee, 3G and extract RFPI, LAP addresses and so on. It allows us to differentiate devices that work in a conntrolled area.