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RF Fundamentals & Signal Propagation Flashcards

6 cards from real CWNA practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 6 RF Fundamentals & Signal Propagation flashcards as text

  1. What unit is used to express the ratio of transmitted power to received power in a wireless link?

    Answer: dB

    The decibel (dB) is a dimensionless unit used to express the ratio between two power levels in a wireless link.

  2. Which phenomenon causes a wireless signal to bend around obstacles and corners?

    Answer: Diffraction

    Diffraction causes radio waves to bend around edges and obstacles, allowing signals to reach areas not in direct line of sight.

  3. What is the free-space path loss (FSPL) most dependent on?

    Answer: Frequency and distance

    Free-space path loss increases with both higher frequency and greater distance between transmitter and receiver.

  4. Which multipath effect can cause partial or complete signal cancellation at the receiver?

    Answer: Destructive interference

    Destructive interference occurs when multipath signals arrive out of phase and combine to reduce or cancel the received signal.

  5. What percentage of the first Fresnel zone should be kept clear of obstructions for optimal link performance?

    Answer: 60%

    Industry best practice requires at least 60% of the first Fresnel zone to be clear of obstructions to avoid significant signal degradation.

  6. A wireless link has a transmit power of 20 dBm and a cable loss of 3 dB. What is the effective transmit power at the antenna port?

    Answer: 17 dBm

    Subtracting the 3 dB cable loss from the 20 dBm transmit power yields 17 dBm at the antenna port.

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