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.
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
PVR stands for "personal video recorder," while DVR stands for "digital video recorder," and both devices are essentially the same. A PVR is similar to a VCR although it records data from the TV via a digital format, while a VCR records it in an analog format. DVRs are devices that are connected with the video signal and the TV.Full Answer >
Alternating Current (AC) and Direct Current (DC) adapters differ across factors, such as the amount of energy that can be carried, flow of electrons and passive parameters. According to Diffen, he most basic difference between an AC and DC adapter is that the former has rotating magnetism along the wire, while the latter has steady magnetism along the wire.Full Answer >
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 >
The difference between LCD and LED televisions is the lighting technology used. Both LCDs and LEDs use a liquid crystal matrix to display images, but LCDs use a fluorescent panel as a backlight, while LEDs use an array of LED bulbs.Full Answer >