Abstract: In order to study the irradiation effects on switching power supply and communication station, an experiment is carried out by using out-band continuous wave as jamming signal. The effect of restart appears when the communication station is under out-of-band strong field interference. The main reason is the influence of out-of-band continuous wave jamming on the normal operation of switching power supply, which results in its output voltage drop. When the power supplys voltage drops to a certain extent, the station will be shut down. Eliminating the interference, the station will restart and turn back to normal station automatically. As equipment under test(EUT), the switching power supply and communication station have various susceptibility to continuous wave jamming at frequency from 20 to 100 MHz. When the jamming signal frequency is 70 MHz, the EUT is most susceptible. And the half wavelength of the 70 MHz signal is similar to the cable length, which indicates that the coupling channel here is the cable. The station is ineffective to sensitive frequency and critical interference E-field strength as a frequency equipment.