Question T2B09
From subelement T2 - T2B
Why are simplex channels designated in the VHF/UHF band plans?
Why is this correct?
Simplex channels allow direct station-to-station communication on the same frequency without using repeaters. This preserves repeater availability for stations that actually need the extended range. Options B and C are incorrect because simplex channels serve general local communication, not specifically contests or DX work. Option D is wrong because simplex operation doesn't involve repeater access at all—stations communicate directly.
Memory tip
Look for the key distinction: simplex uses one frequency for both transmit and receive, while repeaters use two frequencies. When a question mentions 'tying up' or 'preserving' repeater resources, simplex operation is likely the answer since it provides an alternative communication method.
Learn more
Simplex channels serve as the amateur radio equivalent of direct person-to-person conversation rather than going through a telephone operator. The VHF/UHF band plans designate specific simplex frequencies like 146.52 MHz (2-meter national calling frequency) to help stations find each other for local communication. This frequency coordination prevents interference and ensures efficient spectrum utilization while maintaining repeater availability for stations requiring extended coverage areas or emergency communications.
Think about it
Why do you think amateur radio operators would want to avoid 'tying up' repeaters when they could communicate directly?