Blocking the Fresnel zone can cause RF signal interference. What effect does this have on the RF link?

• A. Increased RF signal interference.
• B. Improved signal quality.
• C. No impact on the RF link.
• D. Only affects visual sight.

Answer: (A)

The Fresnel zone is the space around the direct line between the transmitter and receiver where most of the RF energy propagates. If something blocks part of that zone, the signal can’t travel along clean, unobstructed paths. This causes diffraction, reflection, and scattering, which reduces the energy that actually reaches the receiver and can create multipath effects. The result is degraded signal quality and more interference-like symptoms, such as fading and instability in the link. So blocking the Fresnel zone leads to increased RF signal interference, i.e., a weaker and less reliable link.