Frequency - how fast a cycle repast itself
Wavelength - how wide is one cycle
Amplitude - related directly with power
Hertz (Hz) - how often a wave repeats per second
Low frequency travels further than higher frequency because it is less affected by the air
RSSI - Received Signal Strength Indicator
• Closer to zero better
• Negative value measured in dBm
Lost of RF
• Free Path Lost - wave gets weaker as it moves away from the emitting source
• Scattering - reflection occurred on the air due humidity or dust
• Reflection - wave bounce on a obstacle
• Refraction - when a wave changes direction because it changes the medium. E.g. when a wave passes from air to water
RSSI - Noise = SNR (Signal to Noise Ratio)
No comments:
Post a Comment