In the Friis transmission equation, Pt(dBW) represents what?

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Master the AN/PRC-160 and AN/PRC-163 Radio Operations Test. Utilize flashcards and multiple choice questions, each with hints and explanations. Ace your exam!

Multiple Choice

In the Friis transmission equation, Pt(dBW) represents what?

Explanation:
The main idea is how transmitter power is represented when using decibel units in the Friis equation. Pt(dBW) is the transmitter power expressed in decibels relative to one watt. In the dB form of Friis, powers and gains are added: Pr(dBW) = Pt(dBW) + Gt(dBi) + Gr(dBi) + 20 log10(λ/(4πR)). Using dBW lets you convert the linear multiplication of Pt, Gt, and Gr into simple addition, which is why Pt is given in dBW. This is different from dBm, which is referenced to 1 milliwatt. For example, a transmitter power of 5 W corresponds to Pt(dBW) ≈ 6.99 dBW.

The main idea is how transmitter power is represented when using decibel units in the Friis equation. Pt(dBW) is the transmitter power expressed in decibels relative to one watt. In the dB form of Friis, powers and gains are added: Pr(dBW) = Pt(dBW) + Gt(dBi) + Gr(dBi) + 20 log10(λ/(4πR)). Using dBW lets you convert the linear multiplication of Pt, Gt, and Gr into simple addition, which is why Pt is given in dBW. This is different from dBm, which is referenced to 1 milliwatt. For example, a transmitter power of 5 W corresponds to Pt(dBW) ≈ 6.99 dBW.

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