The difference between UHF, ultra-high frequency, and VHF, very high frequency, is that the frequencies used in UHF are much higher than those in VHF. Both, however, are relatively high frequencies for radio waves as the names imply. Signals sent via VHF are less directional and travel further than UHF signals, making them preferable for their typical purpose of broadcasting television.Know More
Both UHF and VHF broadcasting are declining in use as television is increasingly received through cable and satellite services; however, several channels in each are still designated by the government for use. While VHF signals have a greater range and ability to broadcast through or around physical obstacles, UHF signals are more resistant to common types of electromagnetic interference.
Receivers and transmitters of UHF signals tend to be more expensive than those for VHF receivers, as dealing with the higher frequencies requires more specialized equipment. UHF antennas are often more compact than VHF antennas, making them preferable in some situations. Because of their reduced range, UHF systems often require substantially more power to work properly.
While UHF has many disadvantages, it is often preferable when transmitting from an urban environment. These environments have an abundance of electromagnetic interference sources that are minimized with UHF signals.Learn more about Television & Video
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The main differences between OLED and LED include illumination method, picture quality, price and energy efficiency. The primary difference between OLED and LED is the method used to create the picture. OLED stands for organic light-emitting diode, and OLEDs use organic compounds to create the picture when electricity enters the diode. LED stands for light-emitting diode, and LEDs are similar to small bulbs that illuminate when electricity enters the bulb.Full Answer >
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The primary difference between DVD+R and DVD-R is the type of recorder used to write the discs. DVD-R is an older format that dates back to 1997, while DVD+R is a newer recording technology created in 2002. The two types of discs hold the same amount of information, but DVD+R discs are less susceptible to write errors. Most modern DVD players read both types of discs.Full Answer >