Radio theory 📡
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13 Terms
What frequency range is HF?
3–30 MHz
What frequency range is VHF?
30–300 MHz
What is UHF?
300 MHz–3 GHz
What does line of sight mean?
the transmitting and receiving antennas have a direct, unobstructed path to each other
What affects radio range?
objects. frequencies travel in straight lines and do not bend around the Earth's curvature.
What is skywave propagation?
signals are bent or returned back to Earth by the ionosphere
When would you choose HF over VHF?
long-distance. HF bounce of the ionosphere, talking across oceans.
what is ground wave propagation
Radio waves travel directly along the contour of the Earth's surface.
what is space wave propagation
Radio waves travel in a straight line from the transmitting antenna to the receiving antenna.
what is a whip antenna
omnidirectional
VHF and UHF radio.
Vehicle-mounted and radios.
Short to medium-range
what is a dipole antenna
HF and Long range. needs more space
satellite antenna
long range HF, uses starlink, less effected by earth curvature and objects
Why is antenna height important?
Higher antennas improve line-of-sight by reducing the impact of obstacles.