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A Level     Wireless     >Bands<     Wave Calculations    

Wireless Bands


Site for Eduqas/WJEC - Go to the AQA site.

  A Level    Wireless Transmission  0 of 11    Question 737    Antenna Length Calculation 
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Deadline not set1 of 11    Question 1344    FM Band 
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Deadline not set3 of 11    Question 183    Radio Waves - Facts 
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Deadline not set4 of 11    Question 357    Wave Length Calculation 
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Deadline not set5 of 11    Question 358    Wave Length Calculation 
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Deadline not set6 of 11    Question 361    Wave Length Calculation 
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Deadline not set7 of 11    Question 1221    Wavelengths 
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Deadline not set8 of 11    Question 1222    Wavelengths 
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Deadline not set9 of 11    Question 1342    Waves 
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Deadline not set10 of 11    Question 64    Waves 
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Deadline not set11 of 11    Question 65    Waves 
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Radio Frequencies / Electromagnetic Radiation

Radio Frequencies (RF) begin at about 50 kHz although, experimentally, lower frequencies are in use.

The yellow highlighted areas are more likely to be in the exam.

 

Name

Frequency Range

Wavelength Range

Comments

AM Channels Video

ELF

extremely low frequency

3 - 30 Hz

100 000 - 10 000 km

  • Efficient antennas are too big to be practicable.
0 0
SLF superlow frequency 30 - 300 Hz 10 000 - 1000 km
  • Efficient antennas are too big to be practicable.
0 0
ULF ultralow frequency 300 - 3000 Hz 1000 - 100 km
  • Efficient antennas are too big to be practicable.
0 0
VLF very low frequency 3 - 30 kHz 100 - 10 km
  • Efficient antennas are too big to be practicable.
2 or 3 0
LF low frequency 30 - 300 kHz 10 - 1 km
  • 60kHz Time and Frequency Standard
  • Long Wave Radio Band (AM Used)

27

0
MF medium frequency 300 - 3000 kHz 1 km - 100 m
  • Medium Wave
  • AM used

270

0

HF high frequency 3 - 30 MHz 100 m - 10 m
  • Short Wave Radio Bands
  • AM used
  • Many digital modes are used on HF for text, image and data transmission.

2 700

3

VHF very high frequency 30 - 300 MHz 10 - 1 m
  • FM Radio Band
  • DAB Radio Band

27 000

27

UHF ultrahigh frequency 300 - 3000 MHz 1m - 10 cm
  • TV Transmissions (low end) e.g. Freeview
  • Mobile Phones (450 - 2000 MHz)

270 000

270

SHF superhigh frequency 3 - 30 GHz 10 - 1 cm
  • WiFi Wireless Networking 2-11 and 10-66 GHz
2 700 000 2 700
EHF extremely high frequency 30 - 300 GHz 1 cm - 1 mm
  • WiFi Wireless Networking 2-11 and 10-66 GHz
Lots! 27 000
  Infra-Red 300 GHz - 4.3 x 1014 Hz  
  • Warmth / Heat Radiation
   
  Visible Light 4.3 x 1014 - 7.5 x 1014 Hz  
  • Commonly used for optical fibre communication.
  • Using multiple fibres perhaps 7 billion people can have a hi-def TV channel.
Lots! Lots!
  Ultra-Violet 7.5 x 1014 - 3 x 1017 Hz  
  • Sun Burn - Harmful
   
  X-Rays 7.5 x 1014 - 3 x 1017 Hz  
  • Hospital X Rays - Harmful
   
  Gamma-Rays > 3 x 1019 Hz  
  • Nuclear Reactions, Radiotherapy - Harmful
   
  Cosmic Rays > 3 x 1021 Hz  
  • Stellar and Galactic Events - Harmful
   

Channel Spacing

AM Bandwidth

Spectrum Plot of AM Transmissions

The LF Band

The MF Band

The HF Bands

The Electromagnetic Spectrum

Some of the information in this image is correct.

Xkcd electromagnetic spectrum.png    Thanks xkcd

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