# Sevencyclopaedia - Measurements

This is a greatly expanded entry from the Sevencyclopaedia. By Murray Smith.

## Frequency:

**Megahertz:**
A hertz is a term used in physics to describe a unit of frequency equal to
one cycle per second, named after German physicist H.R.Hertz (1857-1894 AD).
A megahertz is used to denote a million hertz. In telecommunications,
'frequency' is used to denote the number of cycles per second of the carrier
wave of the transmission, so it was informally used for a frequency band or
channel. It was in this context that, in Killer, Avon said that the crystal
ran the spectrum from 'Bands L to Y up to thirty thousand megahertz'.
Band L is from 1 to 2 GHz. Band Y has no definition in 2004AD.

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