Whitepaper

RF Test setup for measuring Power & Harmonics

Exodus Advanced Communications

This application note from Exodus Advanced Communications details a basic RF test setup for measuring amplifier output power and harmonic performance. The method utilizes calibrated high-power couplers or attenuators connected to the amplifier’s RF output, coupled with a power meter (e.g., Anritsu ML2487A) and sensor (Anritsu MA244D) to verify rated power at 3-5 frequency points. Harmonic measurements are performed at the amplifier's P1dB rating using a spectrum analyzer (e.g., Agilent E4408B) to record the 2nd and 3rd harmonics, either directly from the output or via the RF sample port for filter verification. Alternative harmonic measurement techniques include utilizing an anechoic chamber with a broadband horn antenna. Proper calibration of all test equipment (signal source Anritsu-68369A/NV, load/attenuator Weinshel-82-30-34, coupler Werlatone-C10336-16) and accounting for insertion losses are emphasized for accurate results.