Question T2A11
From subelement T2 - T2A
What term describes an amateur station that is transmitting and receiving on the same frequency?
Why is this correct?
Simplex operation means transmitting and receiving on the same frequency, allowing direct station-to-station communication. Full duplex uses two different frequencies simultaneously (like repeaters that receive on one frequency and transmit on another). Diplex and multiplex are not standard amateur radio operating terms for frequency usage patterns.
Memory tip
Remember the pattern: 'Simple' operations use one thing - simplex uses one frequency. Complex operations use multiple things - duplex uses two frequencies. This linguistic connection helps distinguish operating modes across amateur radio scenarios.
Learn more
Simplex channels serve as direct communication pathways between stations within range, bypassing repeater infrastructure entirely. The FCC's frequency coordination under Part 97 designates specific simplex frequencies like 146.520 MHz as national calling frequencies to help stations establish initial contact before moving to working frequencies. This preserves repeater capacity for stations requiring extended range coverage.
Think about it
Why do you think amateur radio operators choose simplex over repeater operation for local communications, even when repeaters are available?