High power broadcasting skywave transmitters' desensitizationeffects analysis

摘要

It is noted that the operation of high-power broadcastingtransmitters (Tx) may strongly interfere with co-located and even remoteradio communication receivers over broad frequency ranges. Preliminaryspecifications of 500 kW skywave Tx parameters demonstrate that the mostdisturbed radio systems are airborne voice and data radio receiversoperating in the HF frequency band (2-30 MHz). Using semi-empiricalstate-of-the-art computation methods, limits for victim receiverdistances and frequency intervals for no-interference receptionconditions can be developed. The method developed includes the analysisof the influential system sources, when one or more high-power Tx isoperating simultaneously. It is concluded that the depth ofdesensitization is clearly dependent on the characteristics of the inputand IF (intermediate frequency) crystal filters