WIRELESS TRANSMISSION DEVICE AND SELF-CHECKING METHOD THEREOF

摘要

A wireless transmission device and a self-checking method thereof are provided in embodiments of this invention. The wireless transmission device includes a service processing unit, a duplexer, a radio frequency receiving unit, a frequency synthesizer and a controller. The controller starts the self-checking function, reduces TR interval to a predetermined range, and according to the reduced TR interval, controls the frequency synthesizer to adjust the frequency of a local oscillation signal which is output to the radio frequency receiving unit. The service processing unit continues to send a service signal as a self-checking signal. After the self-checking signal is modulated into a radio signal, part of the self-checking signal can leak in the radio frequency receiving unit though the duplexer. After the radio frequency receiving unit mixes the received signal and the local oscillation signal, the frequency of the self-checking signal in the output signal drops into a band-pass range of a middle frequency receiving unit so as to guarantee the self-checking signal to circulate back to the service processing unit and confirm whether the self transmission path is failed.