Its first use was as an insulator for highfrequencycable (RADAR). Its main use is now for films, for packaging and agriculture.
最初用于高频电缆的绝缘体（如雷达），现主要用于农膜、包装膜和食品包装膜。
2
But in the highfrequency measurements, the effect of cable will lead to serious errors.
这在测量频率较高时将会产生较大的系统误差。
3
Based on analyzing the theory of OFDM (Orthogonal Frequency Division Multiplexing) and characteristic of cable transmission, the Modem of high speed cable telemetry system has been designed.