Question T3B09
From subelement T3 - T3B
What frequency range is referred to as UHF?
Why is this correct?
UHF stands for Ultra High Frequency and covers 300 to 3000 MHz. The frequency bands follow a logical progression: HF (High Frequency) is 3-30 MHz, VHF (Very High Frequency) is 30-300 MHz, and UHF (Ultra High Frequency) is 300-3000 MHz. Each band represents frequencies 10 times higher than the previous one. Options A and C use kHz units which are far too low for UHF, while option B describes VHF's range.
Memory tip
Notice the pattern: each frequency designation increases by a factor of 10. HF starts at 3, VHF at 30, UHF at 300. This 'powers of 10' progression makes memorizing all three bands much easier than trying to remember each range independently.
Learn more
UHF's 300-3000 MHz range makes it ideal for local communications with excellent building penetration in urban areas. The 70-centimeter amateur band (420-450 MHz) falls within UHF and provides reliable short-range communications for repeaters and handheld radios. UHF waves reflect well off buildings and surfaces, creating multiple signal paths that help overcome obstacles in dense environments, though they don't propagate as far as lower frequency bands.
Think about it
Why do you think UHF frequencies are particularly well-suited for handheld radios and repeater systems in urban environments?