Почему одни и те же усилители имеют разную дальность передачи?

Почему одни и те же усилители имеют разную дальность передачи? In the descriptions of км-30км-дальний-беспроводной-видео-передатчик-приемник-передача-приемопередатчик и Вкан1681, I found that the quotes for 5W amplifiers are different at 30km and 50km. The quotes for the same 10W amplifier are also different at 30km and 100km. Isn’t the wireless transmission distance determined by the amplifier?

Вопрос: Please explain what is the difference between kits with a transmission power of 5W, which operate at a distance of, например, 30 и 55 км?

Ответ: We understand that different built-in amplifiers will have different transmission distances.

Однако, the core communication modules with different distances will have different prices. Например, 30km and 55km.

The signal of a 5W amplifier will be stronger at 30km, and the signal may be weaker at 55km. The specific distance and amplifier to choose depends on the distance you need to transmit and the local wireless signal environment. The more complex it is, the larger the amplifier, and the stronger the interference.