Question T3B07
From subelement T3 - T3B
In addition to frequency, which of the following is used to identify amateur radio bands?
Why is this correct?
Amateur radio bands are identified by their approximate wavelength in meters because wavelength and frequency are inversely related (wavelength = 300/frequency in MHz). When we say '2-meter band' for 144-148 MHz, we're referencing the approximate 2-meter wavelength. Traditional letter/number designators like 'HF' describe frequency ranges, not specific bands. Channel numbers aren't used in amateur radio band identification.
Memory tip
Look for the physical dimension pattern: amateur bands use wavelength measurements (20m, 2m, 70cm) because wavelength directly relates to antenna size and propagation characteristics. This makes bands intuitive to remember and practically meaningful for equipment selection.
Learn more
Amateur frequency privileges are organized around wavelength because antenna efficiency depends on wavelength relationships. A quarter-wave vertical antenna for the 2-meter band is about 19 inches tall, while one for the 20-meter band is about 16 feet. This wavelength-based naming system helps operators quickly estimate antenna requirements and understand propagation characteristics across different emission standards.
Think about it
Why do you think amateur radio uses wavelength rather than just frequency numbers when naming bands, especially considering that most other radio services use frequency designations?