Space wave propagation mode is used for the transmission of VHF and UHF because UHF and VHF can neither be propagated through Ground waves (due to high absorption in the atmosphere) nor via Sky waves (due to non reflection of the ionosphere).
Read moreWhat wave is used for VHF?
VHF, in full very high frequency, conventionally defined portion of the electromagnetic spectrum including any radiation with a wavelength between 1 and 10 metres and a frequency between 300 and 30 megahertz . VHF signals are widely employed for television and radio transmissions.
Read moreIs VHF a radio wave?
VHF includes radio waves from 30 MHz to 300 MHz . VHF waves must not exceed the local radio horizon of 100 miles. VHF frequencies are less likely to be interrupted by atmospheric noise, issues with electrical equipment, and other interferences.21 Eyl 2015
Read moreWhat is radio frequency in communication?
A radio frequency (RF) signal refers to a wireless electromagnetic signal used as a form of communication , if one is discussing wireless electronics. Radio waves are a form of electromagnetic radiation with identified radio frequencies that range from 3kHz to 300 GHz.
Read moreHow does RF radio communication work?
Radio frequency waves (RF) are generated when an alternating current goes through a conductive material . Waves are characterized by their frequency and length. Frequency is measured in hertz (or cycles per second) and wavelength is measured in meters (or centimeters).
Read moreWhat is high frequency communication?
High frequency (HF) is an electromagnetic frequency defined by the International Telecommunications Union (ITU) for radar and radio communications . It operates in a range of three to thirty MHz and as the wavelengths spread over ten to one hundred meters, it is also known as decameter wave and designated as band 7.
Read moreWhy do we use high frequency carrier for modulation?
For the transmission of audio signals at distant places, the high frequency carrier waves are used, because these frequency carrier waves travel through space or medium with the speed of light and they are not obstructed by earth’s atmosphere .
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