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Chapter 3 Radio Frequency Components, Measurements, and Mathematics

Chapter 3 Radio Frequency Components, Measurements, and Mathematics. Key Terms & Concepts. 3 Basic Requirements for Communication Two or more devices want to communicate Medium or method for them to communicate Set of rules for them to use. Key Terms & Concepts. Transmitter

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Chapter 3 Radio Frequency Components, Measurements, and Mathematics

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  1. Chapter 3Radio Frequency Components, Measurements, and Mathematics

  2. Key Terms & Concepts • 3 Basic Requirements for Communication • Two or more devices want to communicate • Medium or method for them to communicate • Set of rules for them to use

  3. Key Terms & Concepts • Transmitter • Generates signal at specific frequency • Determines amplitude (power level) of signal • Antenna • Collects AC signal that receives from transmitter • Directs, or radiates, RF waves away from the antenna in a specific pattern

  4. Key Terms & Concepts • Receiver • Receives the signal from the antenna and translates the signal into 1s and 0s • Intentional Radiator (IR) • Specifically designed to generate RF • Consists of all components from transmitter to antenna, excluding antenna

  5. Key Terms & Concepts • Equivalent Isotropically Radiated Power (EIRP) • Highest RF signal strength transmitted from antenna • Focuses the RF generated by the IR and makes it stronger

  6. Key Terms & Concepts • Units of Power • Watt • 1 Watt = 1 ampere (amp) of current flowing at 1 volt • Amp is current • Voltage is pressure generated • Amount of watts generated = volts X amps • Milliwatt (mW) • 1/1,000 of a watt • Decibels relative to 1 milliwatt (dBm) • Compares signal to 1 milliwatt of power • 0 dBm = 1 milliwatt

  7. Units of Comparison Decibel (dB) Represents difference btw 2 values Decibels isotropic (dBi) Gain or increase of power from an antenna when compared to what an isotropic radiator would generate Key Terms & Concepts

  8. Key Terms & Concepts • Units of Comparison • Decibels dipole (dBd) • Increase in gain of an antenna when it is compared to the signal of a dipole antenna • If antenna has value of 3 dBd, it is 3 dB greater than a dipole antenna

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