WASHINGTON — ViaSat Inc. Chief Executive Mark D. Dankberg said the sequence of events that led to defects in two of the four Ka-band antennas on the ViaSat-2 satellite remains a mystery.

While ViaSat has estimated a 13% drop in capacity, the satellite’s performance is strong enough that the company’s business model for it has not been modified. ViaSat-2 is now in commercial service. Dankberg discussed this issue March 13 at the Satellite 2018 conference in Washington.

How is it that two Harris Corp.-built . . .

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