High power broadcasting skywave transmitters´ desensitization effects analysis

It is noted that the operation of high-power broadcasting transmitters (Tx) may strongly interfere with co-located and even remote radio communication receivers over broad frequency ranges. Preliminary specifications of 500 kW skywave Tx parameters demonstrate that the most disturbed radio systems are airborne voice and data radio receivers operating in the HF frequency band (2-30 MHz). Using semi-empirical state-of-the-art computation methods, limits for victim receiver distances and frequency intervals for no-interference reception conditions can be developed. The method developed includes the analysis of the influential system sources, when one or more high-power Tx is operating simultaneously. It is concluded that the depth of desensitization is clearly dependent on the characteristics of the input and IF (intermediate frequency) crystal filters