What is a key characteristic of a line-of-sight radio link?

What is a key characteristic of a line-of-sight radio link?

• A. It requires a clear, unobstructed path between transmitter and receiver
• B. It relies on satellite relays
• C. It works equally well indoors behind walls
• D. It does not depend on distance

Answer: (A)

Line-of-sight radio links rely on a direct path for the signal to travel from transmitter to receiver. The radio wave travels roughly in a straight line, so any obstruction—like buildings, hills, or trees—can block or weaken the signal, leading to dropouts or degraded performance. That’s why a clear, unobstructed path is essential for reliable communication at the frequencies used in common drone and short-range radio links. These links don’t depend on satellite relays, so they won’t work well with walls and indoor environments where the signal is absorbed or blocked. And as distance increases, the signal strength diminishes and performance becomes more limited, so the link does depend on distance.

Line-of-sight radio links rely on a direct path for the signal to travel from transmitter to receiver. The radio wave travels roughly in a straight line, so any obstruction—like buildings, hills, or trees—can block or weaken the signal, leading to dropouts or degraded performance. That’s why a clear, unobstructed path is essential for reliable communication at the frequencies used in common drone and short-range radio links. These links don’t depend on satellite relays, so they won’t work well with walls and indoor environments where the signal is absorbed or blocked. And as distance increases, the signal strength diminishes and performance becomes more limited, so the link does depend on distance.