Status update on the system validation of APERTIF, the phased array feed system for the westerbork synthesis radio telescope

Phased Array Feed (PAF) systems are installed on the Westerbork dishes, enabling new science for the astronomical community. Twelve dishes are equipped with PAF system hardware, and the central processing systems are in place too. The PAFs need a dedicated calibration scheme in order to satisfy stability requirements. The verification process has finished for most system elements, and the first validation test passed with flying colors.