A11 and A12 frequencies are best described as what kind and distance?

• A. Digital trunked frequencies for citywide coverage
• B. Conventional simplex radio frequencies used for short-range communication within 1 mile
• C. Satellite communications for dispatch
• D. Long-range HF frequencies

Answer: (B)

This item tests your understanding of radio channel types and their typical operating range. A11 and A12 are conventional simplex frequencies used for direct, short-range communication on a single channel, typically within about a mile. Simplex means you communicate directly between radios without a repeater or network infrastructure, which is ideal for quick, local coordination on the scene. Digital trunked frequencies, by contrast, involve a network that dynamically assigns channels over a larger area, not the simple,-local setup described here. Satellite communications would be far more for distant, infrastructure-heavy links rather than everyday on-scene dispatch. Long-range HF frequencies are designed for long-distance contact, not the tight, city-block or near-block distances implied by these channels. So the best description is conventional simplex radio frequencies used for short-range communication within about 1 mile.