When more than one radio set is operating simultaneously in the same platform, the inter modulation frequencies are generated due to sum and difference frequencies of their carriers which could affect these radio sets mutually. Also these sum and difference interfering frequencies will have sufficient radiated field intensity especially the third order mixing products that could lead to blocking of signals in the receivers co located in nearby platforms also. Therefore it is necessary to evolve a frequency table for the entire operating band of frequencies of Radio sets, especially when it is more than two carriers. For three Radio sets mutual EMI problem this computation was carried out for a tactical vehicle equipped with HF, VHF-VHF Communication configuration. Besides inter modulation EMI in radio sets, there are EMI issues connected with Communication system installation aspects including grounding and other EMI contributions from co located electronic subsystems of same vehicular platform. This paper addresses those issues in brief and concludes with a consolidated flow chart for resolving them, illustrating the actions necessary for meeting the EMC goals of multi radio set Communication System.

Keywords: EMI, EMC, Inter modulation, Multi Radio sets, Harmonics, MIL-Std.