Abstract: Ordinary digital data is reformed and time shifted such that it may be broadcast over a radio link which periodically shifts its frequency. The system of this invention utilizes timing information obtained from a pre-existing frequency-hopping radio link in conjunction with its own buffer and control circuitry to accurately time-position discrete digital data packets within those time bands of the radio transmission wherein the frequency is not changing from one frequency to another. In the drawing, T.sub.H1 is a very short duration pulse which commands the AM frequency--hopping system to shift frequencies. The time period necessary for the frequency hop operation to settle down and attain a stable frequency is represented by the interval between T.sub.H1 and T.sub.1. The actual reception of the uplink message occurs in the interval between T.sub.3 and T.sub.4 ; transmission of the downlink signal from the system occurs in the interval between T.sub.5 and T.sub.6. The interval between T.sub.4 and T.sub.