Aspects of a method and system for a reference signal timing loop for OFDM symbol synchronization and tracking may include tracking symbol timing in an Orthogonal Frequency Division Multiplexing signal based on at least a reference symbol set. For scattering measurements, a Hartmann-Shack calibration image of a measurement system is acquired to define a first plurality of point spread functions. The first and second rotary clutch portions are rotatably disposed about a rotary axis of the clutched driven device.