Question T2A07
From subelement T2 - T2A
What is meant by "repeater offset”?
Why is this correct?
Repeater offset is the frequency difference between where a repeater transmits and receives. Since repeaters can't simultaneously transmit and receive on the same frequency, they use two different frequencies with a specific offset between them. Common offsets are ±600 kHz on 2 meters and ±5 MHz on 70 cm. Options B, C, and D describe unrelated concepts—time delays, identification procedures, and simultaneous frequencies—none of which define what 'offset' means in repeater operation.
Memory tip
Remember that 'offset' in radio always refers to frequency separation. When you see 'offset' in any amateur radio context, think frequency difference first. This pattern applies whether discussing repeater offsets, crystal oscillator offsets, or frequency coordination—the term consistently indicates a measured frequency gap between two reference points.
Learn more
Repeater offset enables full-duplex operation through frequency diversity. Your radio automatically shifts between transmit and receive frequencies based on programmed offset values. Understanding offset is crucial for proper repeater coordination under Part 97.205(c), which governs repeater frequency privileges. Modern transceivers typically auto-set standard offsets, but auxiliary stations and linked systems may require manual offset programming for proper network integration and interference mitigation.
Think about it
Why do you think repeaters can't simply use the same frequency for both transmit and receive like simplex operation does?