What prevents RF energy from being transmitted?

• A. Dummy load
• B. Antenna cover
• C. Shielding
• D. Grounding

Answer: (A)

The key idea is providing a path that absorbs RF energy so nothing is radiated. A dummy load is designed to absorb nearly all the transmitter’s power and convert it to heat, presenting the proper impedance (usually 50 ohms) to the transmitter. With the energy being absorbed rather than sent into an antenna, there’s essentially no RF radiation escaping, which is exactly how you prevent transmission during testing or maintenance.

Other options don’t guarantee that no energy is radiated. An antenna cover protects the antenna from the environment but doesn’t stop RF from being emitted if the transmitter is active. Shielding can reduce emissions from a device, but it’s not a direct, reliable method for keeping the energy from being transmitted through the system. Grounding is about safety and static dissipation; it helps prevent shocks and reduce stray currents, but it doesn’t eliminate the possibility of radiation when the transmitter is driving an antenna.

So, using a dummy load provides a safe, predictable way to dissipate RF power and prevent actual transmission.