In order to improve the survivability of the frequency equipment

we analyzed the survivability under the in-band multi-frequency electromagnetic environment of typical communication equipment. To analyze the in-band interference mechanism

we established two survivability forecasting models based on two different susceptibility parameters. The electromagnetic radiation effects of single-frequency

dual-frequency

and triple-frequency continuous wave in-band were tested

and the radiation effect change rule was studied in the different frequencies and different magnitudes combinations. The results show that the average power determined model results of in-band dual-frequency

and triple-frequency tests are all approximate 1

the amplitude determined model results are different

the dual-frequency tests results are about 1.4

and the tri-frequency tests results are about 1.6. The results demonstrate the electromagnetic radiation effect in-band of the equipment under test is determined by the interference signal average power

and the second model is able to forecast the typical communication equipment survivability effectively under the in-band multi-frequency electromagnetic environment.