We present the radio light curves of lensed images of the gravitational lens B1422+231 .
The observations have been carried out using the VLA at 8.4 and 15 GHz over a period of 197 days .
We describe a method to estimate the time delay from the observed light curves .
Using this method , our cross-correlation analysis shows that the time delay between images B and A is 1.5 \pm 1.4d , between A and C is 7.6 \pm 2.5d , between B and C is 8.2 \pm 2.0d .
When applied to other lensed systems with measured time delays our new method gives comparable results .