The RF port of a TV is used to connect the signal line of a cable TV or antenna.
The RF interface of the TV set is commonly known as the antenna port, it is a necessary interface for the old cable TV, able to receive TV programs provided by various local cable operators by connecting to the cable line, is a very old standard.
The development of RF interface in China can be traced back to the 1980s. As operators upgraded the digital set-top boxes they provided, the interface gradually lost its usefulness, and even some Internet TVs no longer provide RF input interfaces.
Expanded
Common TV interfaces
1, ANT input interface
ANT interface is the "antenna interface", is the earliest kind of video interface on the TV, used to connect to the antenna to receive TV signals.
The ANT connector is the "antenna connector", the earliest type of video connector on a TV, used to connect an antenna to receive TV signals.
2, color difference component input interface
Color difference component interface is a kind of interface after the closed-circuit interface, but also a relatively early interface on the TV, which usually uses YPbPr and YCbCr two kinds of identification, the former represents the progressive scanning color output, the latter represents the interlaced color output.
3, AV composite video input interface
This interface is in fact the basis of the color difference component, the screen chrominance, luminance superimposed.AV composite video interface, the yellow interface has three signals, and the color difference component interface needs blue, green, red, the three component signals together to complete the video transmission.
4, S-terminal input interface
The S-terminal interface on the back of the TV is also known as the "two-component video interface", which is mainly used to connect with the S-terminal interface equipment, video and audio signals to the TV set.
5, VGA video input interface
This interface transmits analog signals, only supports video transmission, does not support audio, usually in the VGA interface next to the corresponding 3.5MM audio input interface, so if the computer is connected to the TV want to have a sound, you need to separate external audio to achieve.
6, HDMI audio and video input interface
HDMI interface is a ladder shape, it is a digital audio and video interface, suitable for image transmission of the special digital interface, audio and video signals can be transmitted at the same time, without the need to transmit the signal before the digital / analog or analog / digital conversion. It is a mainstream and widely used interface in the current market.
7, digital audio output interface
Digital audio interface, divided into fiber optic and coaxial, in fact, the two interfaces are very good to distinguish between fiber optic is a square port, coaxial is a round port.
8, USB interface
Used to connect storage devices, such as USB flash drives, card readers, etc., the U disk or card reader in the picture, video, information on the TV to read. In addition, it can also be connected to external devices such as cameras, gamepads, dancing blankets, and can also temporarily charge your cell phone.
Baidu Encyclopedia-RF Video Terminal