CWT Antenna Systems & Site Surveys Flashcards
6 cards from real CWT practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 CWT Antenna Systems & Site Surveys flashcards as text
What is the free-space path loss (FSPL) principle and how does it affect wireless network design?
Answer: The natural attenuation of RF signals as they propagate through open air, increasing with distance and frequency
Free-space path loss is the reduction in signal strength as an RF wave travels through open air, increasing with both distance and frequency.
A directional Yagi antenna is BEST suited for which deployment scenario?
Answer: Creating a point-to-point outdoor wireless bridge between two buildings
Yagi antennas concentrate RF energy in a narrow beam, making them ideal for point-to-point links where maximizing gain in one direction is critical.
What does the term 'beamwidth' describe in the context of antenna specifications?
Answer: The angle in degrees between the half-power (-3 dB) points of an antenna's radiation pattern
Beamwidth is the angular measurement between the -3 dB points of an antenna's radiation pattern, indicating how focused or broad the coverage area is.
What is multipath propagation and what problem can it cause in wireless networks?
Answer: RF signals arriving at a receiver via multiple reflected paths, potentially causing interference or fading
Multipath propagation occurs when reflected RF copies of a signal arrive at slightly different times, which can cause destructive interference and signal fading.
Which tool is specifically designed to detect non-Wi-Fi interference sources such as microwave ovens and Bluetooth devices during a site survey?
Answer: Spectrum analyzer
A spectrum analyzer sweeps across radio frequencies to display all RF energy, including non-Wi-Fi sources that protocol analyzers cannot detect.
What is the Fresnel zone and why must it be considered for outdoor point-to-point links?
Answer: A series of ellipsoidal regions around the line of sight that must be kept mostly clear to avoid signal diffraction and loss
The Fresnel zone is an ellipsoidal volume around the line-of-sight path; obstructions within this zone diffract RF energy and reduce link performance.