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电话侦检器安装在室内电话接线盒处,当有人试图在话外线(从交换机用户电路出线到侦检器之间)任何一处并机使用时,电话侦检器立刻将电话外线环路,强迫电话线上的电压降至3.6V以下,使得窃用电话机不能正常拨号,同时电话侦检器上的发光二极管点燃。窃用者摘除电话机后,线路恢复正常。 电话侦检器对主人所接电话的使用毫无影响,但当主人通话期间怀疑有人窃听时,可按下电话机键簧,如发现电话侦检器上的指示灯亮,则说明有人窃听,这时,电话侦检器会产生报警音对窃听者进行警
Telephone detector installed in the telephone terminal box, when someone tries to talk in the line (from the exchange of user circuits to the detector between) the parallel use of any one, the telephone detector immediately telephone outside loop, Forcing the voltage on the telephone line to drop below 3.6V, so that the theft telephone can not dial normally, and the light emitting diode on the telephone detector ignites. After the thief removed the phone, the line returned to normal. The telephone detector has no effect on the use of the call received by the host. However, when it is suspicious that someone eavesdrops during the call, he or she can press the key spring. If the indicator on the telephone detector is on, it means that someone has eavesdropped it. When the phone detector will have an alarm sound eavesdropping on the police