[derefr]

Or just buffer each broadcast segment into some 60GHz memory (is there such a thing?), and either rely on your signalling protocol being TDMI (and you therefore not needing to send/receive more than a fraction of the time) or on your broadcast signal being periodically repeating, such that the radio can just treat that memory as a ring buffer to play over and over.

Or, do what old computer architectures did when their CPUs were slower than their DACs: add a Programmable Interval Timer (i.e. a very simple synthesizer) in between, such that you just send a few commands and it adds together some 60GHz triangle and square waves to achieve the signal shape you want. Maybe even add a sequencer, and then stream it some 60GHz MIDI files!