(electromagnetic radiation, frequency 3-30 MHz)
Radio astronomy uses the term high frequency (HF)
which is the ITU term for the radio spectral band
from 3-30 MHz, with the term very high frequency (VHF)
as the next step for higher frequency. These are
used within communications for FM radio and television.
Radio astronomers sometimes use HF/high frequency in this manner
but may sometimes use the term in a more general sense for relatively
high frequencies within the radio band, extending much higher than
30 MHz, e.g., extending into microwave.
| || |
Referenced by pages: