Through studying the radio repeating technology at danger zone, adding the intrinsically safe barrier and using Leaky cable, the Radio signal can be intrinsically safe level, the leaky cable is a coaxial cable for radio transportation , also is receiver and transmiter for radio signal.

And the leaky cable perimeter intruder inspection technology is selected, which has the lowest rate of missing report, can be secluded well, be little affected by Environment, and be adaptable to various geographical conditions.

This paper illustrates the stray current s formation and hazards,and puts forward a leakage cable plus equivalent potential connection method to remedy the existing problem with the traditional stray current protection system.

In this paper we discuss the L band DAB coverage system using leakage cable by example of Shanghai subway coverage system.

The broadcasting station whose antenna is leak cable is one of popular campus broadcasting stations,this station has some characteristic such as signal area is moderate and easy to control,have reliable and well-proportioned signal,have little interfere with environment etc.

In this paper, leakage cable performance and main reason of effecting parameter are introduced.