Selecting an RF Signal Generator requires a deep dive into technical specifications to ensure it meets your testing requirements. Key factors include Frequency Range, which must cover your target bands (e.g., 9kHz to 6GHz or higher), and Frequency Resolution. You must also evaluate Output Power Accuracy and Level Range to ensure the device can simulate both weak and strong signals without distortion. For digital communications, prioritize units with Vector Signal Generation (IQ Modulation) capabilities and high Phase Noise performance (e.g., <-110 dBc/Hz at 20 kHz offset) to maintain signal integrity.