SXM‑7: SiriusXM’s High-Power Satellite

Overview & Purpose

SXM‑7 is a high-power, S-band digital audio satellite built by Maxar Technologies on the 1300-class bus. Launched to reinforce SiriusXM’s radio network, it delivers music, news, sports, and entertainment to millions of receivers across the U.S., Canada, Puerto Rico, and the Caribbean, ensuring uninterrupted service and enhanced signal strength.

Launch Details

• Launch Date: December 13, 2020
• Launch Vehicle: SpaceX Falcon 9 Block 5, Booster B1051 on its 7th flight
• Launch Site: Cape Canaveral SLC‑40, Florida
• Mass at Launch: Approximately 7,000 kg (15,432 lb)
• Orbit: Inserted into geostationary transfer orbit (GTO) and later maneuvered into operational geostationary position by onboard propulsion

Satellite Features

• Platform: Maxar 1300-class bus
• Power Output: Over 8,000 watts of broadcast power, making it the highest-density S-band commercial satellite in orbit
• Antenna: Large (~10 m) mesh reflector optimized for reliable reception in moving vehicles
• Design Life: 15+ years

Operational Context

SXM‑7 enhances SiriusXM’s geostationary constellation by replacing aging units (XM‑3/XM‑4) and operating alongside SXM-8 to ensure continuous coverage through at least 2036.

In-Orbit Incident

In January 2021, SiriusXM disclosed that SXM‑7 encountered payload failures during in‑orbit testing affecting some components. Despite the issue, the company confirmed that existing satellites (XM‑3, XM‑4) and spare units (SXM‑5) ensured no disruption to service