I will present ongoing work to better characterize the response of the Long Wavelength Array (LWA) antenna. Recent work has focused on directly measuring the impedance mismatch between the antenna and front end electronics (FEEs). Custom calibration and testing fixtures were created which allows for measurement of the antenna impedance at the feed points on the FEE boards. These measurements...
With unprecedented sensitivity and field of view, new generation radiotelescopes at low frequencies have to face new calibration challenges. One of the main drivers to cope with direction-dependent distortion (due to strong off-axis sources) is to develop a knowledge of beamshapes and how they vary in frequency and direction. I am going to present recent modelling work carried on VLA and...
