CENTER HARBOR, New Hampshire — Satellite fleet operator APT Satellite Holdings Ltd. reported revenue and profit increases for the six months ending June 30 but most of the boost was due to a nonrecurring technical support and project-management business.

Hong Kong-based APT said it expects its core business of leasing capacity on its five satellites to remain steady and highly profitable — its EBITDA margin was 84% for the first half of 2018 — despite East Asia’s renowned satellite overcapacity and pressure on transponder prices.

APT said its transponder . . .

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