The most important specifications are frequency range, phase noise, output power range, and switching speed. Phase noise is especially critical for radar, communications, and quantum computing applications — lower phase noise (measured in dBc/Hz at a given offset) means a cleaner signal. For multi-channel setups, channel-to-channel isolation and phase coherence also matter. BNC offers dedicated low-noise (LN) and ultra-low-noise (LN+) options for demanding applications