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The development of radio communications, in particular, appearance of radios (narrowband radios, broadband radios and radio relays) enabling the voice and data transmission services in digital modes has resulted in the use of radio communication devices at each, stationary and mobile command posts. One of the challenges faced by those who organize the radio communication systems is to ensure the internal compatibility of the radio system (suppressing internal interferences). The most difficult problem in that area is the frequency planning for radios located at the same object (co-site work). An incorrect assignment of frequencies for co-site radios may lead to degradation of communication or even may result in a lack of communication. An advanced frequency planning and the knowledge on the impact of a strong interference signal on the required level of useful signal can have a critical meaning for the radio communication system, especially because of the limited number of frequency resources and requirements for minimizing of the radio link signal level [7]. The modern electronic warfare includes an activity related to the electronic attack, oriented towards degradation or destruction of radio electronic devices by the use of electromagnetic energy and radio electronic security, oriented towards protection of radio electronic devices against the effects of use of electromagnetic energy. An important activity of the radio electronic security is the immunizing radio electronic devices against signals which degrade, neutralize or completely block the ability of their work. Because of thus he activity oriented towards the fight against internal system interference is the foundation for preparing radio system against radio jamming.
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