85 % of 120 is 102 kms ..... that is the tracking range of JF-17 for 5 m2 RCS. For 10 m2 RCS The Detection Range of KLJ-7 will be around 135 - 140 kms. KLJ-7 is not a high power radar. So as the Target range increases, The tracking range % gets reduced due to loss of power & disturbance in reception of reflected wave. Therefore consider 77-80 % as tracking range for 10 m2 RCS target. Even at 80% of 140kms the tracking range would be 112 kms. My previous calculation was based on 77% & so was not wrong.
& PESA Radar [N011M] are hard to jam then MSA [KLJ-7]. So in a dense electronic jamming environment the performance of JF-17 will fall drastically when compared to Su-30MKI.
JF-17 Are inferior of Su-30MKI but they have provided PAF with a cost efficient solution for replacement of mirages & f-7. And JF-17 Outperforms & Is a generation ahead of the aircraft's it is replacing.
The most important thing is the STRATEGY of the user.