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Do you know all the weak cable types?
We often use different brands of equipment, but the cables used in each device are different. Which kind of computer is used, which makes engineers feel a headache. Below the weak electric Jun will list the cables that are often used in the project to facilitate the engineers to better select the cables. In this issue, we will learn about the use of common cables.
Video cable: a coaxial cable used to transmit video baseband analog signals
1, SYV
Fully known as solid polyethylene insulated RF coaxial cable. S---coaxial RF cable, Y---polyethylene, V---polyvinyl chloride. It is commonly used in analog surveillance systems, video intercom systems, and cable television systems to transmit video signals.
The specifications of the SYV video cable are:
SYV75-3, transmission distance 100-300 meters
SYV75-5, transmission distance 300-500 meters
SYV75-7, transmission distance 500-800 meters
SYV75-9, transmission distance 1000-1500 meters
SYV75-12, transmission distance 2000-3500 meters
2, SYWV
Fully called polyethylene physical foam insulation coaxial cable, usually used for Weixing TV transmission and cable transmission, long-distance video intercom system dedicated cable, suitable for RF transmission.
The same point between SYV and SYWV:
The same characteristic impedance - 75 ohms;
The outer sheath, the shielding layer structure, the outer diameter of the insulating layer, the number of the selection, the material selection, and the number of shielding layers are basically the same.
The difference between SYV and SYWV:
The physical properties of the insulating layer are different: SYV is 100% polyethylene filled, SYWV is also filled with polyethylene, but filled with 80% of nitrogen bubbles, polyethylene only contains 20%;
The core wire diameter is different: SYV cable is 0.78-0.8mm, SYWV cable is 1.0mm;
The transmission characteristics of the two cables - the transmission attenuation is different.
3, RG
Fully called physical foamed polyethylene insulated access network cable, usually used for transmission of data analog signals in weak video image transmission or hybrid fiber coaxial cable network (HFC network).
According to the use, it can be divided into: baseband coaxial cable and broadband coaxial cable. At present, the commonly used cable for baseband is a mesh made of copper with an impedance of 50 (such as RG-8, RG-58, etc.); the shield of a common cable for broadband coaxial cable is usually stamped with aluminum. The characteristic impedance is 75 (such as RG-59, etc.). RG-58/59 RG is the number of the RF cable series, RG plus different numbers to indicate the RF cable with different structure and performance.
The most commonly used are the following: RG-8 or RG-11 (50Ω), RG-58 (50Ω), RG-59 (75Ω), RG-62 (93Ω). The RG cable is usually installed between the device and the device. A connector is provided at each user location to provide an interface to the user.
The installation method of the interface is as follows:
(1) Thin cable: Cut the thin cable, put the BNC head on both ends, and then connect it to the T-connector.
(2) Thick cable: Generally, it is installed by a tap device like a splint. It uses the guiding pin on the Tap to penetrate the insulation layer of the cable and directly connect with the conductor. Terminals are provided at both ends of the cable to attenuate the reflection of the signal.
4, AV
The AV cable is an abbreviation for Audio Cable and Video Cable in Home Audio, so it is also called audio and video cable. Mainly used for audio equipment, audio and video signal connections for home video equipment.
Power cord: a wire that transmits current, consisting of an outer sheath, an inner sheath, and a copper wire.
1, AVVR
It is called a copper core PVC insulated PVC sheathed flexible cable. Usually used for weak current power supply.
2, RVV
Fully called copper core PVC insulated PVC sheathed flexible cable. The RVV line has a round shape and a large number of cores, and has a twist between the two cores. R stands for the cord and V stands for the insulator polyvinyl chloride (PVC). RVV cables are mainly used in power lines, control lines and signal transmission lines that do not need to be shielded, such as electrical appliances, instruments and electronic equipment, and automation devices.
Commonly used RVV wire types are: RVV2*0.5, RVV2*0.75, RVV2*1.0.
The difference between AVVR and RVV: AVVR and RVV are the same wire. Models with a width of 0.5 square or more are classified as RVV (including 0.5 square), and models below 0.5 square are classified as AVVR.
Audio line: A line used to transmit electroacoustic signals or data
1, telephone line
HYV is a copper core solid polyolefin insulated moisture barrier polyethylene sheathed local communication cable. Common specifications are two-core and four-core, with wire diameters of 0.4 and 0.5, respectively, and 0.8 and 1.0 in several regions. Common materials (conductors) are copper clad steel, copper clad aluminum, and all copper. Among them, only the telephone line that uses copper is used to meet the national standard. Commonly used for communication engineering wiring, connection between indoor telephone communication cable system wiring, trunk lines between voice communication systems, program-controlled switches, telephone, fax and digital telephone.
Typical models are: HYV2x1/0.4 CCS, HYV4x1/0.4 CCS, HYV2x1/0.4 BC, HYV2x1/0.5 BC, HYV4x1/0.4 BC, HYV4x1/0.5 BC, HSYV 2x2x0.5 BC (Note: CCS is copper clad steel, BC is all bronze).
2, audio cable
Audio cable, referred to as audio cable. The sound quality of the sound line on the market is mainly made of gold, silver and oxygen. Generally used to transmit unamplified audio signals, such as computer, VCD, DVD, radio connected amplifiers. The audio cable is basically not needed when wiring, because the audio source device and the power amplifier are often put together, these lines are very short, and the configuration can be done later.
The main specifications of the audio cable are: audio line 2 × 0.122, audio line 71C, audio line 2 × 0.32.
Classification of audio lines:
Audio cable: A set of audio cables is often two, divided into left and right channels, and both ends of the line are lotus heads (RCA heads).
Coaxial: used to transmit multi-channel signals (Dolby AC-3 or DTS signals), similar to audio lines, because of the large amount of signals, connectors and lines are thicker than ordinary audio lines, generally used to connect DVD players with Amplifier.
Fiber optic cable: Also used to transmit multi-channel signals (Dolby AC-3 or DTS signals) for connecting DVD players to amplifiers.
Microphone cable: A two-core coaxial cable for connecting a power amplifier to a microphone.