What is calculated using the numerical values of the transmitter power level, cable loss, and antenna gain?

Question

Options

• AEIRP
• BdBi
• CRSSI
• DSNR

• A
  89% (24)
• C
  7% (2)
• D
  4% (1)

Explanation

EIRP (Effective Isotropic Radiated Power) is calculated by taking the transmitter's power output, subtracting any cable/connector losses, and adding the antenna gain - giving you the effective power being radiated into the air. This formula (EIRP = Transmitter Power - Cable Loss + Antenna Gain) represents the real-world power output of a wireless system and is used to ensure compliance with regulatory limits.

Why the distractors are wrong:

• dBi is simply a unit of measurement for antenna gain relative to an isotropic radiator, not a calculated value using all three components.
• RSSI (Received Signal Strength Indicator) measures the signal strength received at a device, not transmitted power - it's measured at the endpoint, not calculated from transmitter specs.
• SNR (Signal-to-Noise Ratio) compares signal strength to background noise and does not involve transmitter power, cable loss, and antenna gain in its core calculation.

Memory Tip: Think of EIRP as the "end result" of your transmit chain - Everything In = Radiated Power. Just remember: Power minus Loss plus Gain = EIRP, like a budget for your signal going out the antenna.

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