Experimental study and empirical evaluation of carrier compression and third order intermodulation products of unequal carriers in a communication satellite transponder

Carrier compression and third-order intermodulation products of two and three unequal carriers have been studied experimentally using the 36 MHz-wide C-band transponder of the INSAT-1B satellite. From the experimental data, empirical relations for carrier compression for two unequal carriers have been derived which agree with the measured data within + or - 0.5 dB. The empirical relations for carrier compression derived for two unequal carriers have been extended to three unequal carriers and good correlations with measured data have been obtained. Empirical relations for third-order intermodulation products of two and three (f1 + f2 - f3 type) unequal carriers have also been derived.