The
TARGET HF3
receiver covers the entire spectrum from 30 kHz to
30
MHz.
For the beginner, what does this mean???
The symbol Hz (pronounced Hertz, and named after a famous radio
pioneer) represents one complete electromagnetic wave in a second.
A
kilohertz (kHz) is one thousand waves per second, and a Megahertz
(MHz), a million waves in a second. The number
of
waves per second is
called the Frequency.
1
WAVE
IN
1
SECOND
= 1
HERTZ
Often a reference is made to a stations wavelength rather than it’s
frequency. High frequency signals have short wavelengths and low
frequency signals have long wavelengths. The frequency of a signal in
kHz is given by dividing 300,000 by the wavelength in metres.
SHORT WAVE
MEDIUM WAVE
-
L O N G
W A V E
- -
HIGH
FREQUENCY
LOW FREQUENCY
Why are high frequency waves shorter than low frequency
???
Imagine that you could see a wave travelling past you at the speed of
light. The wavelength would be the distance between two adjacent
waves. If you increase the frequency of the waves then you would get
more waves in the same space
so
the wavelength would be shorter.
1
