... New technologies have made it possible to construct an affordable radio telescope with collecting area of one square km: the SKA. ... In particular, there was a transition (about 1980) from large single dishes to arrays of smaller dishes. ... Figure 3: ATA in nulls, Bower(2002). ... The reduction in the cost and size of the electronics in telescopes of the future will allow radio astronomers to take increasing advantage of multibeaming through either focal plane or aperture plane arrays. ...