Phase Methods for Precision Measurements at BASE

The Baryon Antibaryon Symmetry Experiment (BASE) is a high-precision experiment that aims to test CPT invariance by comparing the fundamental properties of matter/antimatter conjugates with high precision. It aims to compare the charge-to-mass ratios and g-factors of protons and antiprotons to the part-per-trillion level. Phase-sensitive measurement methods have allowed for some of the most precise measurements of g-factor and charge-to-mass ratios yet, and show promise for improved results. This report describes the hardware that was built to perform fast and reliable phase-sensitive measurements in BASE. The hardware was fully characterised and successfully implemented in the experiment, and has been demonstrated to work as expected.