A far-field orbiting calibrator is a crucial part of the LuSEE design and a major piece of technology demonstration. A calibrator will send a single polarization coded digitally coded signal that will be detected in cross-correlation at high significance and in strong isolation, even in the presence of other strong signals from the sky. The calibration will allow us to measure the full spectral response of our instrument along many directions on the sky, and in combination with modeling will allow an unprecedented control of systematics. Our antenna response will be, at the precision required for the Dark Ages experiment, sensitive to the electromagnetic properties of the lunar regolith, which are unknown in advance. The far field calibration will thus at the same time calibrate the response of our antennas, and give useful information about the lunar soil beneath the experiment. Bids will be solicited to produce a calibrator, to be delivered on the CLPS CS-4 mission.