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產(chǎn)品名稱：Multi core coaxial cable video cable SYV-75-5-41
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添加時(shí)間：2025-03-25 15:53:39
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介紹：

SYV-75-5-41，SYV是實(shí)芯聚乙烯絕緣聚氯乙烯護(hù)套射頻同軸電纜，其中75的意思是導(dǎo)體的電阻為75歐姆，5是指電纜的絕緣zui大外徑為5mm(標(biāo)準(zhǔn)要求4.8±0.2mm).，41為產(chǎn)品代號(hào)。(引用標(biāo)準(zhǔn)GB/T14864-1993 實(shí)芯聚乙烯絕緣射頻電纜) 視頻線又根據(jù)材質(zhì)的不同分為SYV和SYWV兩種

SYV-75-5-41, SYV is a solid core polyethylene insulated PVC sheathed RF coaxial cable, where 75 means the resistance of the conductor is 75 ohms, and 5 refers to the insulation of the cable with a maximum outer diameter of 5mm (standard requirement 4.8 ± 0.2mm), 41 is the product code. (Reference standard GB/T14864-1993 Solid core polyethylene insulated RF cable) Video cables are divided into SYV and SYWV according to different materials

SYV

syv 指實(shí)心聚乙烯絕緣的同軸電纜，國(guó)標(biāo)代號(hào)是射頻電纜——又叫“視頻電纜”

Syv refers to coaxial cables with solid polyethylene insulation, and the national standard code is RF cable - also known as "video cable"

一般所指的視頻線為電視有線，也可用作安防領(lǐng)域的監(jiān)控?cái)z像頭用線。

The video cable generally refers to television cable, which can also be used as a cable for surveillance cameras in the field of security.

下面是一般視頻線的參數(shù)

Here are the parameters of a typical video cable

75代表抗阻性,后面的3和5代表它的絕緣外徑(3mm/5mm)

75 represents resistance, followed by 3 and 5 representing its insulation outer diameter (3mm/5mm)

SYV中S---同軸射頻電纜,Y---聚乙烯,V---聚氯乙烯.

SYV S-coaxial RF cable, Y-polyethylene, V-polyvinyl chloride

SYV75-3傳輸在300米之內(nèi)效果好.

SYV75-3 has good transmission performance within 300 meters

SYV75-5傳輸在800米內(nèi)效果更好.

The transmission effect of SYV75-5 is better within 800 meters

75-3 傳輸距離 100米

75-3 transmission distance of 100 meters

75-5 傳輸距離 300米

75-5 transmission distance of 300 meters

75-7 傳輸距離 500--800米

75-7 transmission distance 500-800 meters

75-9 傳輸距離 1000---1500米

75-9 transmission distance 1000-1500 meters

75-12 傳輸距離 2000----3500米

75-12 transmission distance 2000-3500 meters

75代表電阻, -3代表線徑

75 represents resistance, -3 represents wire diameter

SYWV

sywv 指聚乙烯物理發(fā)泡絕緣的同軸電纜，國(guó)標(biāo)代號(hào)是射頻電纜

Sywv refers to coaxial cables with polyethylene physical foam insulation, and the national standard code is RF cable

SYV與SYWV的相同點(diǎn)

Similarities between SYV and SYWV

1. 特性阻抗一樣——75歐姆；

1. Same characteristic impedance -75 ohms;

2. 外層護(hù)套，屏蔽層結(jié)構(gòu)，絕緣層外徑，編數(shù)選擇，材質(zhì)選擇，屏蔽層數(shù)等基本相同。

2. The outer sheath, shielding layer structure, insulation layer outer diameter, number selection, material selection, shielding layers, etc. are basically the same.

SYV與SYWV的不同點(diǎn)

Differences between SYV and SYWV

1. 絕緣層物理特性不同：syv是100%聚乙烯填充，介電常數(shù)ε=2.2-2.4左右；而sywv也是聚乙烯填充，但充有80%的氮?dú)鈿馀?，聚乙烯只含?0%，宏觀平均介電常數(shù)ε=1.4左右；ε=εǎ?jε",其中，ε"為損耗項(xiàng)，空氣的ε"基本為“0”，這一工藝成就于90年代，它有效降低了同軸電纜的介電損耗；

1. The physical properties of the insulation layer are different: Syv is filled with 100% polyethylene, with a dielectric constant of approximately 2.2-2.4; And Sywv is also filled with polyethylene, but filled with 80% nitrogen gas bubbles, polyethylene only contains 20%, and the macroscopic average dielectric constant ε is about 1.4; ε=εǎ? J ε ", where ε" is the loss term, and the ε "of air is basically" 0 ". This process was achieved in the 1990s and effectively reduced the dielectric loss of coaxial cables;

2. 芯線直徑不同：以75-5為例，由于-5電纜結(jié)構(gòu)標(biāo)準(zhǔn)規(guī)定，絕緣層外徑（即屏蔽層內(nèi)徑）是4.8mm,不能改變，為了保證75歐姆的特性阻抗，而特性阻抗只與內(nèi)外導(dǎo)體直徑比和絕緣層的介電常數(shù)ε大小有關(guān)，ε大芯線細(xì)，ε小芯線粗，芯線直徑：syv是0.78-0.8mm, sywv是1.0mm; 芯線結(jié)構(gòu)形式都可以是單股或多股；這一區(qū)別，導(dǎo)致了芯線電阻的不同。如實(shí)測(cè)天成、愛普syv75-5電纜，1000米芯線直流電阻39Ω，典型sywv75-5電纜, 1000米芯線直流電阻19-20Ω;

2. Different core wire diameters: Taking 75-5 as an example, due to the -5 cable structure standard, the outer diameter of the insulation layer (i.e. the inner diameter of the shielding layer) is 4.8mm and cannot be changed. In order to ensure a characteristic impedance of 75 ohms, which is only related to the ratio of the inner and outer conductor diameters and the dielectric constant ε of the insulation layer, the larger ε core wire is thinner, the smaller ε core wire is thicker, and the core wire diameter: syv is 0.78-0.8mm, Sywv is 1.0mm; The core wire structure can be single or multiple strands; This difference leads to different core wire resistances. True testing of Tiancheng and Aipu SyV75-5 cables shows a DC resistance of 39 Ω for a 1000 meter core wire, while a typical SyWV75-5 cable has a DC resistance of 19-20 Ω for a 1000 meter core wire;

3. 上述兩項(xiàng)根本區(qū)別，決定了兩種電纜的傳輸特性——傳輸衰減不同，syv電纜是早期的同軸電纜，在幾十上百年時(shí)間里一直用它傳輸，包括傳輸射頻信號(hào)；但后來(lái)當(dāng)sywv出現(xiàn)后，射頻以上波段就很少應(yīng)用syv了。因?yàn)楦哳l衰減差別太大了；慢慢的syv就基本上主要用在監(jiān)控視頻傳輸上了，也就把這種射頻電纜的 “元老”，改稱為“視頻電纜”了。但這不等于說(shuō)：syv“視頻電纜”的視頻傳輸特性比sywv好，實(shí)際剛好相反，sywv的視頻傳輸特性也優(yōu)于syv電纜。這方面的誤解很普遍，且我國(guó)南方比北方的誤解要嚴(yán)重，認(rèn)為傳輸視頻信號(hào)， “須用視頻電纜”。實(shí)測(cè)1000米電纜視頻傳輸性能，sywv75-5/64編電纜：0.5m—5.15db,6m—19.12db;國(guó)標(biāo)syv75-5/96編電纜：0.5m—6.43db,6m—21.76db（相同編網(wǎng)結(jié)構(gòu)電纜衰減比發(fā)泡電纜大3db——即大1.4倍以上），有一個(gè)還挺有名的廠家產(chǎn)品，syv75-5/128編電纜，6m—25.22db，衰減比發(fā)泡電纜大6db以上——即大2倍多）；

3. The two fundamental differences mentioned above determine the transmission characteristics of the two types of cables - transmission attenuation is different. Syv cable is an early coaxial cable that has been used for transmission, including RF signals, for decades or even centuries; But later on, when SywV appeared, Syv was rarely used in the RF and above bands. Because the difference in high-frequency attenuation is too large; Gradually, Syv was mainly used for monitoring video transmission, and the "veterans" of this RF cable were renamed as "video cables". But this does not mean that the video transmission characteristics of syv "video cable" are better than those of sywv. In fact, the opposite is true, and the video transmission characteristics of sywv are also better than those of syv cable. Misunderstandings in this regard are common, and more severe in southern China than in northern China, where it is believed that transmitting video signals requires the use of video cables. Tested video transmission performance of 1000 meter cable, sywv75-5/64 cable: 0.5m-5.15db, 6m -19.12db; National standard syv75-5/96 braided cable: 0.5m-6.43db, 6m -21.76db (the attenuation of cables with the same braided network structure is 3db greater than that of foam cables - that is, more than 1.4 times greater). There is a well-known manufacturer's product, syv75-5/128 braided cable, 6m -25.22db, with attenuation more than 6dB greater than that of foam cables - that is, more than 2 times greater);

4. 關(guān)于高編電纜，一般指96-128編以上的電纜。高編電纜明顯特點(diǎn)是：屏蔽層的直流電阻小，200khz以下的低頻衰減少，對(duì)抑制低頻干擾有利，實(shí)測(cè)表明，200khz-6mhz頻率，由于“趨膚效應(yīng)”，128編和64編衰減一樣。（高頻電流只在芯線外表面，屏蔽層內(nèi)表面層流動(dòng)）。從頻率失真（高低頻衰減差異）看，高編電纜反而嚴(yán)重。頻率失真直接影響就是視頻信號(hào)的各種頻率成分的正常比例失真，直接影響到圖像失真；

4. Regarding high-grade cables, they generally refer to cables with a rating of 96-128 or higher. The obvious characteristics of high-grade cables are: the DC resistance of the shielding layer is small, and the low-frequency attenuation below 200kHz is reduced, which is beneficial for suppressing low-frequency interference. Tests have shown that at frequencies of 200kHz-6mHz, due to the "skin effect", the attenuation of 128 and 64 series cables is the same. High frequency current only flows on the outer surface of the core wire and on the inner surface layer of the shielding layer. From the perspective of frequency distortion (difference in attenuation between high and low frequencies), high-density cables are actually more severe. The direct impact of frequency distortion is the distortion of the normal proportion of various frequency components in the video signal, which directly affects image distortion;

5. 銅包鋼芯線：這是sywv電纜的一種，用于有線電視46mhz以上的射頻傳輸，由于“趨膚效應(yīng)”，電流只在鋼絲外面的銅皮里流動(dòng)，衰減特性和純銅芯線一樣，可抗拉強(qiáng)度卻遠(yuǎn)高于銅線；但這種電纜用于視頻傳輸不行，0-200khz低頻衰減太大；

5. Copper clad steel core wire: This is a type of sywv cable used for RF transmission above 46MHz in cable television. Due to the "skin effect", current only flows in the copper skin outside the steel wire, with attenuation characteristics similar to pure copper core wire, but with much higher tensile strength than copper wire; But this type of cable is not suitable for video transmission, as the low-frequency attenuation from 0-200kHz is too large;

6. sywv電纜視頻射頻傳輸特性都優(yōu)異，而且由于有巨大的有線電視市場(chǎng)的支撐，產(chǎn)量很大，價(jià)格也有優(yōu)勢(shì)；

Sywv cable has excellent RF transmission characteristics for video, and due to the support of the huge cable TV market, it has a large production volume and price advantages;

7. 關(guān)于視頻線和射頻線的問(wèn)題，既有誤解，也有誤導(dǎo)，論壇里的激烈爭(zhēng)論就是例證。但大家都應(yīng)該尊重實(shí)踐：用1000米75-5電纜，傳輸一個(gè)彩色攝像機(jī)的信號(hào)，末端送給監(jiān)視器，監(jiān)視器環(huán)路輸出給示波器，測(cè)量“色同步頭” 的幅度，原信號(hào)是0.3v,進(jìn)行比較，電纜越長(zhǎng)，兩種差別越大，越容易比較。

Regarding the issue of video cables and RF cables, there are both misunderstandings and misleading, as evidenced by the intense debate on the forum. But everyone should respect practice: using a 1000 meter 75-5 cable to transmit a signal from a color camera, the end is sent to a monitor, and the monitor loop outputs to an oscilloscope to measure the amplitude of the "color sync head". The original signal is 0.3v, and for comparison, the longer the cable, the greater the difference between the two, making it easier to compare.