Frequency, signal multiplexing modulation and spread sprectrum
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The document defines various radio frequency bands along the electromagnetic spectrum from Extremely Low Frequency (ELF) to Extremely High Frequency (EHF). It lists the wavelength ranges and frequency ranges for each band, and also provides some examples of common technologies that operate within certain bands like AM radio, FM radio, TV, and cellular networks. The document also notes that propagation characteristics vary across the different frequency bands.
![EHF Extremely high frequency 1cm-1mm 30 - 300 GHz SHF Super high frequency 10cm-1cm 3 - 30 GHz UHF Ultra high frequency 1m-10cm 300 MHz - 3 GHz VHF Very high frequency 10m-1m 30 - 300 MHz HF High frequency 100m-10m 3 - 30 MHz MF Medium frequency 1km-100m 300 kHz - 3 MHz LF Low frequency 10km-1km 30 - 300 kHz VLF Very low frequency 100km-10km 3 - 30 kHz ULF Ultra low frequency 10^3km-100km 300 - 3000 Hz SLF Super low frequency 10^4km-10^3km 30 - 300 Hz ELF Extremely low frequency 10^5km-10^4km 3 - 30 Hz Abbreviation [2] Designation Wavelength Frequency](https://image.slidesharecdn.com/frequencysignalmultiplexingmodulationandspreadsprectrum-120128025931-phpapp02/85/Frequency-signal-multiplexing-modulation-and-spread-sprectrum-3-320.jpg)
Frequency, signal multiplexing modulation and spread sprectrum
- 3. EHF Extremely high frequency 1cm-1mm 30 - 300 GHz SHF Super high frequency 10cm-1cm 3 - 30 GHz UHF Ultra high frequency 1m-10cm 300 MHz - 3 GHz VHF Very high frequency 10m-1m 30 - 300 MHz HF High frequency 100m-10m 3 - 30 MHz MF Medium frequency 1km-100m 300 kHz - 3 MHz LF Low frequency 10km-1km 30 - 300 kHz VLF Very low frequency 100km-10km 3 - 30 kHz ULF Ultra low frequency 10^3km-100km 300 - 3000 Hz SLF Super low frequency 10^4km-10^3km 30 - 300 Hz ELF Extremely low frequency 10^5km-10^4km 3 - 30 Hz Abbreviation [2] Designation Wavelength Frequency
- 4. EM Spectrum S/W radio 902 – 928 Mhz 2.4 – 2.4835 Ghz 5.725 – 5.785 Ghz ISM band Propagation characteristics are different in each frequency band LF HF VHF UHF SHF EHF MF AM radio UV FM radio TV TV cellular 1 MHz 1 kHz 1 GHz 1 THz 1 PHz 1 EHz infrared visible X rays Gamma rays 30kHz 300kHz 3MHz 30MHz 300MHz 30GHz 300GHz 10km 1km 100m 10m 1m 10cm 1cm 100mm 3GHz
- 5. Unlicensed Radio Spectrum 902 Mhz 928 Mhz 26 Mhz 83.5 Mhz 125 Mhz 2.4 Ghz 2.4835 Ghz 5.725 Ghz 5.785 Ghz cordless phones baby monitors Wireless LANs 802.11b Bluetooth Microwave oven 802.11a HyperLan 33cm 12cm 5cm