RF signals offer relatively short range as compared to light signals. True or false?
What type of weather impacts RF signals the most?
Answer: Heavy rain.
Why does interference cause errors in wireless networks?
Answer: The interference causes the receiver to misunderstand the signal because two signals are present at the same time.
What are sources of RF interference?
Answer: General examples include cordless phones, microwave ovens, and Bluetooth devices.
Multipath affects higher data rates more than lower data rates for 2.4 GHz systems. True or false?
Answer: True. The receiver has difficulties with differentiating one bit from another when demodulating high data rate signals because the bits are close together.
What is meant by a diffused infrared light system?
Answer: A system that emits light in all directions that reflects off of the ceiling and walls.
Approximately up to what range do direct infrared systems operate?
Answer: 1 mile.
How does modulation make it possible to transmit information through the air?
Answer: Modulation superimposes an information signal onto a carrier signal that has a frequency suitable for propagating through the air.
What attributes of a signal does QAM change in order to represent information?
Answer: Amplitude and phase.
Spread spectrum generally requires user licenses. True or false?