Band and attenuation - Frequency band: 9 kHz to 4 GHz. Attenuation varies with frequency; exact values are shown in the S21 curve index. Attenuation range and steps - Programmable attenuation: 0 to 31.75 dB in 0.25 dB steps. Power and control - Supply: 5V DC, typical current 5 mA. - Interfaces: supports parallel port and serial port control for easy integration with test setups. Why this matters - Provides precise, adjustable signal level control across a wide RF range. - Fine 0.25 dB steps enable accurate calibration and level matching. - Frequency dependent attenuation can be accounted for using the S21 curve data. Use scenarios - RF test bench: set and automate input levels for receivers or DUTs across 9 kHz to 4 GHz. - Front-end calibration: adjust attenuation while characterizing performance over the band. - Automated test systems: control attenuation via parallel or serial interface within test sequences. Notes - Attenuation values vary with frequency; refer to the S21 curve for exact figures at your operating frequency.