What is the main difference between direct communication and a repeater?

The main difference between direct communication and a repeater revolves around the concept of line of sight. Direct communication typically requires a clear, unobstructed path between the transmitting and receiving parties, which is often referred to as a line of sight. This means that both parties must be able to see each other or have a direct route for the signals to travel without interference.

On the other hand, a repeater functions differently by receiving signals and amplifying them to extend their reach. It can relay signals over longer distances or around obstacles that would otherwise block direct communication. This capability allows for communication that doesn't necessarily adhere to the line of sight requirement, as repeaters can receive and transmit signals from various angles and locations.

In summary, the emphasis on line of sight in direct communication highlights the need for a straightforward connection, whereas the ability of repeaters to relay signals emphasizes their role in overcoming distance and obstructions, enhancing the overall communication range and effectiveness.