Which two tools are needed to measure the attenuation value of obstacles? (Multiple choice)

Question

Options

• ASurveying tools: tape measure, distance meter
• BObservation and recording telescopes and cameras
• CSignal source fat AP
• DSignal scanning laptop

• A
  11% (4)
• B
  6% (2)
• C
  83% (29)

Explanation

To measure obstacle attenuation, you need a signal source to transmit and a receiver to capture signal strength on the other side - the fat AP (C) generates the wireless signal, while the scanning laptop (D) measures the received signal strength indicator (RSSI). By comparing signal levels before and after the obstacle, you calculate how many dB the obstacle absorbs. This two-device setup is the standard method used in Wi-Fi site surveys for RF planning.

Why the distractors are wrong:

• A (tape measure / distance meter): Measures physical distance, not RF signal loss - distance matters for path loss calculations, but not obstacle attenuation directly.
• B (telescopes / cameras): Visual observation tools have no ability to detect or quantify radio frequency signals.

Memory tip: Think "transmit and receive" - you always need a sender (fat AP = signal source) and a listener (laptop = signal scanner) to measure what's lost in between. No source = nothing to measure; no scanner = no reading.

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