Video game coaxial cable
According to the coaxial cable market report released by Research and Markets in June this year, the coaxial cable market is expected to grow at a compound annual growth rate of 4% between 2020 and 2024, increasing by US$2.58 billion. As an important product in the audio-visual entertainment, GPS, and communications industries, it has a wide variety of applications and a wide range of application scenarios. How to fully understand the coaxial cable, just remember the following numbers.
A coaxial cable is a cable with two parts of conductors, namely the center conductor and the outer conductor, and an insulating layer is arranged between the two parts of the conductors.
2 different impedance values
Coaxial lines are divided into 2 categories according to different impedance values: 50 ohms and 75 ohms. Among them, the 50 ohm model is used for digital signal transmission, and the 75 ohm model is used for video signal transmission.
(1) When is 50 ohm coaxial cable applicable?
Common applications include backbone cabling when computers build Ethernet, wireless network antenna feeders, GPS antenna feeders, and mobile phone systems.
(2) When is 75 ohm coaxial cable applicable?
The more typical use is to transmit cable TV signals, usually equipped with F-type connectors. The other is a video signal transmission line as a playback device, such as video recorders, drives, and so on. It is usually equipped with BNC and RCA connectors.
3 product identification
(1) Recognition of reverse polarity coaxial connector
It is mainly for a modification of the standard polarity connector interface-the center pin (male) is configured on the socket theme, and the center jack (female) is configured on the plug theme. This type of reverse polarity connector is commonly used in some key parts of the connection system to prevent misconnection. The commonly used interfaces are reverse polarity SMC and reverse polarity TNC.
(2) Recognition of 50 ohm and 75 ohm BNC connector
Among all types of coaxial connectors, BNC is a special category, and it is easy to distinguish between the two specifications. The 50 ohm BNC connector interface has an ins
There are many interfaces in the audio and video field. BNC and RCA interfaces, as very common video and audio transmission interfaces, have their own advantages in equipment transmission.
The BNC connector is different from the special display interface of the ordinary 15-pin D-SUB standard connector. It is composed of RGB three primary color signals and five independent signal connectors for horizontal synchronization and vertical synchronization. Mainly used to connect workstations and other systems that require high scanning frequency. The BNC connector can isolate the video input signal, reduce the interference between the signals and the signal bandwidth is larger than that of the ordinary D-SUB, which can achieve the best signal response effect.
RCA connector is by far the most common type of audio/video terminal, commonly known as lotus socket. It is not specifically designed for which kind of interface, it can be used for both audio and ordinary video signals.
The RCA terminal adopts the coaxial signal transmission method, the central axis is used to transmit the signal, and the contact layer on the outer edge is used for grounding, which can be used to transmit digital audio signals and analog video signals. RCA audio terminals are generally marked in different colors in pairs: red for the right channel and black or white for the left channel. Sometimes, the center and surround channel cables will be marked with other colors to facilitate the distinction when wiring, but all the RCA connectors in the entire system are the same in terms of electrical performance. Generally speaking, the RCA stereo audio cable is a set of left and right channels, and each channel is a line in appearance.
3. Advantages of both
The main function of the BNC interface is to transmit video signals, and the main function of RCA is to transmit audio signals.
Different interfaces have different advantages and functions. For example, BNC connectors can reduce the interference between video signals and achieve the best signal response. In addition, due to the special design of the BNC interface, the connection is very tight, and there is no need to worry abou
Turn the multimeter knob to the position marked with the buzzer mark.
Connect the black and red test pens of the multimeter to the metal part. At this time, the multimeter emits a continuous beeping sound, and the multimeter is normal.
Strip both ends of the wire to be measured to make it leak out of the metal part.
Make the metal parts of the two test leads of the multimeter close to the two ends of the lead under test, and you will hear a beeping sound at this time!
If there is a beep, it proves that the wire is normal and there is no beep, it proves that the wire is open, and the wire needs to be replaced.
Wire break point measurement method:
Specific method: Connect one end of the wire (cable) with a breakpoint to the live wire of the 220V mains, while the other end is suspended in the air. Pull the digital multimeter to the AC2V block, start from the live wire access end of the wire (cable), hold the tip of the black test lead with one hand, and slowly move the red test lead along the insulating skin of the wire with the other hand, and it will display at this time The voltage value displayed on the screen is about 0.445V (measured by the DT890D meter). When the red test lead moved to a certain place, the voltage displayed on the display suddenly dropped to a few volts (about one tenth of the original voltage), and about 15cm from this position forward (the live wire connection end) is the wire ( Cable) where the breakpoint is located. When using this method to check the shielded wire, if only the core wire is broken and the shielding layer is not broken, it cannot be measured with this method.
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A plug that is generally installed at both ends of a speaker cable for inserting into a banana socket. The name of this plug comes from its slightly bulged shape. It is very convenient to insert the hole on the front of the multi-purpose socket mentioned above, and a very large contact area can be formed after insertion.
This feature makes it a priority to be used in high-power output equipment to connect speakers and receivers/amplifiers. Sometimes you can see banana plugs divided into two groups, called "dual banana plugs", but not all devices can be used. It originated in Germany after the First World War. The original shape was assembled by a base + an iron nail + a shrapnel. Because the original shrapnel was stamped from a metal sheet into four leaves, it was assembled into the iron nail and turned upside down. A banana peeled into four pieces is named "Banana Plug".
Banana plugs have gradually been applied to industrial equipment, teaching equipment, power testing, radio models, medical equipment, automobile testing, audio equipment and other fields due to their excellent electrical performance, simple assembly method, and low-priced finished products. The contact methods of banana plugs mainly include shrapnel type, pin type, cross groove type, and round type.