North Carolina EMT State Practice Exam

What frequency range is utilized by VHF communication in EMS?

1. 30 to 300 MHz

2. 300 to 3,000 MHz

3. 1 to 30 MHz

4. 3,000 to 10,000 MHz

The correct answer is: 30 to 300 MHz

The frequency range utilized by VHF (Very High Frequency) communication in EMS (Emergency Medical Services) is indeed from 30 to 300 MHz. This range is specifically designated for VHF use, which is critical for various forms of communications in emergency situations. VHF communication is favored in EMS settings because it provides good propagation characteristics, allowing for effective communication over relatively long distances, including through obstacles like buildings and terrain. This capability is essential in emergency scenarios where reliable communication can significantly impact response times and coordination of care. The other choices mentioned fall outside the VHF range. The 300 to 3,000 MHz range is classified as UHF (Ultra High Frequency), while frequencies from 1 to 30 MHz are considered HF (High Frequency), which is not typically used for EMS communication. Frequencies ranging from 3,000 to 10,000 MHz would involve microwave communications, which are also not applicable in the usual context of EMS radio communication. Understanding these distinctions is key to comprehending the communication systems utilized in emergency medical services.