Tuesday 26 June 2012

RF Signal Basics - Frequency, Wavelength, Amplitude

The frequency of a wireless signal is how often the signal occurs, 1Hz is 1 cycle per second. A cycle is a complete wave, from peak to dip back to the starting peak. The wavelength is the size of each cycle, and which dictates the frequency, the smaller the cycles the more cycles per second. 2 cycles per second = 2Hz, 7 cycles per second = 7Hz etc.

1Hz = 1 cycle per second
1MHz = 1 million cycles a second
1Ghz = 1 billion cycles a second

Lower frequencies can travel further, but they offer less bandwidth.

Amplitude is the strength of the signal. Amplitude reflects the amount of energy injected into one cycle and has a large effect on the signal strength. The increase in RF signal strength is referred to as the gain. The disadvantage of amps is that the signal can be distorted and / or damage the receiver if too much power is pushed into it.

Attenuation is the gradual loss of signal strength

The electrical fields emitted by antennas are called beams or lobes

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