The variation of subreflector position with frequency was measured at L-, K-, and Q-band. As expected, the L-band focus relation is non-linear between the band edges while the K- and Q-band relations are linear. The focus position at L-band varies by ∼3 cm and by ∼1 mm at both K- and Q-band. This analysis indicates that setting the focus position for a frequency at the center of each band has at most a 1 % effect on efficiency when observing at the edges of the band.
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