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传送视频信号并不见得非用同轴电缆不可。下面我们将证明:用长度达50米的双绞线照样能达到良好的效果。 双绞线具有很强的抗干扰能力,因为一根绞线上电压减小,可通过邻近的绞线补偿,所以无需顾虑拍频干扰。利用差分放大器也能中和拍频干扰。视频信号的带宽远超过音频信号,因此,为了避免反射干扰,在双绞线的输入端和输出端接上一个特征电阻是很有必要的。若采用每厘米2个绕结的双绞线,其典型特征阻抗为100Ω,两导线之间的介电常数很小,则可获得较高
Transmit video signals are not necessarily used coaxial cable can not. Below we will prove: with a length of 50 meters twisted pair still can achieve good results. Twisted pair has a strong anti-interference ability, because the voltage on a twisted wire can be reduced through the adjacent strands, so there is no need to worry about beat frequency interference. Using differential amplifiers also neutralizes beat frequency interference. Video signal bandwidth far exceeds the audio signal, therefore, in order to avoid reflection interference, twisted pair input and output termination of a characteristic resistor is necessary. With 2 twisted pairs per centimeter of twisted pair, the typical characteristic impedance of 100Ω, the dielectric constant between the two wires is very small, you can get higher