Are radio waves line of sight?
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Are radio waves line of sight?
Line-of-sight propagation means radio waves which travel in a straight line from the transmitting antenna to the receiving antenna. Line-of-sight transmission on the surface of the Earth is limited to the distance to the visual horizon, which depends on the height of transmitting and receiving antennas.
What is VHF communication used for?
VHF signals are widely employed for television and radio transmissions. In the United States and Canada, television stations that broadcast on channels 2 through 13 use VHF frequencies, as do FM radio stations. Many amateur radio operators also transmit on frequencies within the VHF band.
What is VHF communication band?
11.1.3 VERY HIGH FREQUENCY (VHF) COMMUNICATION The frequency band of VHF Communication is 30 to 300 MHz. The frequency allotted by WPC (Wireless Planning and Coordination wing of ministry of communication) in VHF for Indian Railways are in the band (a) 85.5 to 86.5 MHz (b) 146.2 to 167.95 MHz.
What is radio line of sight?
Radio transmission requires a clear path between antennas known as radio line of sight. Line of sight is the direct free-space path that exists between two points. Using binoculars on a clear day, it is easy to determine if visual line of sight exists between two points that are miles apart.
Does VHF need line of sight?
VHF radio waves propagate mainly by line-of-sight, so they are blocked by hills and mountains, although due to refraction they can travel somewhat beyond the visual horizon out to about 160 km (100 miles).
Is UHF line of sight?
UHF radio waves propagate mainly by line of sight; they are blocked by hills and large buildings although the transmission through building walls is strong enough for indoor reception. The IEEE defines the UHF radar band as frequencies between 300 MHz and 1 GHz.
What is line-of-sight range in communication?
Line-of-sight is defined as the straight line distance, clear of any objects, between the gateway antenna and each monitor it communicates with.
Is UHF line-of-sight?
Is VHF analog or digital?
Both analog and digital radios send signals over a radio channel using a Very High Frequency (VHF) or Ultra High Frequency (UHF) carrier frequency wave. In simple terms, analog radios use frequency modulation (FM) to encode a voice signal within a carrier wave.