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The Invention of the Radio (pg. 2)
| APPLICATION |
FREQUENCY
DESIGNATION |
FREQUENCY
RANGE |
WAVELENGTH
RANGE |
time signals, standard frequencies |
Very Low Frequency (VLF) |
3 – 30 kHz |
100,000 -10,000m |
| navigational, radio broadcasting |
Low Frequency (LF) |
30 – 300 kHz |
10,000 –1,000m |
| land, radio
broadcasting, maritime mobile |
Medium Frequency
(MF) |
300 – 3,000
kHz |
1,000 –100m |
| mobile, radio broadcasting, amateur |
High Frequency (HF) |
3 – 30 MHz |
100 –10m |
| radio
navigation, mobile, amateur, radio and TV broadcasting |
Very High
Frequency (VHF) |
30 – 300
MHz |
10 –1m |
| space communication, aeronautical mobile, amateur, meteorological |
Ultrahigh Frequency (UHF) |
300 – 3,000 MHz |
1m –10cm |
| radio location,
space communication, navigation, mobile |
Superhigh
Frequency (SHF) |
3 – 30 GHz* |
10cm –100cm |
* kHz (kilohertz) means that
there will be thousands of cycles per second.
* MHz (megahertz) means that there will be millions of cycles per second.
* GHz (gigahertz) means that there will be billions of cycles per second.
Ham Radio
Ham or Amateur radio is a community of radio operators that use transmitters and receivers
to communicate with other amateur operators. You’re probably wondering…why is
it called "ham"? According to G. M. Dodge's The Telegraph Instructor…"Ham
means a poor operator. A 'plug.’" For others, the origin of ham was never
found. Therefore a compromising explanation for the integration of this word in this term
was concluded…nobody knows why.
There are around 600,000 amateur operators in the United States. These amateur operators
or hams can do just about anything they please through the radio, although, they
have a couple minor restrictions or constraints, such as, broadcasting messages to the
public and using the radio for making money in any way. Other than this, they can do many
beneficent things on the radio.
Amateur operators of HF radios can communicate with other hams worldwide; those who own
VHF or UHF transceivers can talk to people in their local community. The radios can also
be used for emergencies -of any kind- when other communication systems fail or go out.
Hams can also establish satellite communications. They even have their own easy to use
satellites!
There are other numerous things you can do through the radio. All you have to be is a ham.
(You become one by getting licensed by the FCC.)
Take the radio quiz!
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Origination of Radio
Invention of AM and FM
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