An electronically trackable ball consisting of a cover, an inflatable bladder, a valve in the bladder a mounting structure attached to said valve and extending inwardly of the valve toward the center of the inflated bladder and an electronic transmission device on said mounting structure remote from said valve. The mounting structure is preferably a lightweight polymeric cylinder with the electronics fitted at the end remote from the valve and close to the center of mass of the ball. The device is within the ball, and is constrained from moving around inside the ball.