The UHF SATCOM system can operate in which modes?

• A. Line-of-sight operation or satellite operation
• B. Line-of-sight operation only
• C. Satellite operation only
• D. Ground-based relays only

Answer: (A)

UHF SATCOM is designed to work in two ways: direct line-of-sight links and via a satellite relay. In line-of-sight mode, terminals communicate directly when they’re within radio range and there are no major obstructions. In satellite mode, a satellite relays the signal to extend reach beyond the horizon, enabling long-range or global communications, though with the usual trade-offs of satellite links such as slightly higher latency and dependence on satellite availability. Because it supports both direct LOS and satellite relay, the best description is that it can operate in line-of-sight operation or satellite operation. The other options are too limiting or describe a situation not defining the system.