Short term ionospheric effects in the form of amplitude scintillation and position wander being successfully recovered during calibration. Panels a–c show different levels of scintillation on Cas A and Cyg A during trial observations. Note the rising Sun in panel c) Panel d shows the deviation of the WSF estimated position of 3C461 during obs. 2 over ~1000 s, as compared to its catalog position. Shown at two frequencies separated by ~30 MHz.