Two high power oscillators both have the same 3-GHz frequency and Q = 100, values typical of HPM sources. Their pulse durations are 100 nsec, also typical of HPM sources. The bandwidth of each is 1%. They are driven in parallel by a pulsed power unit, so they radiate simultaneously. They are to be phase locked together to add their powers before being radiated from an antenna. How well coupled do they have to be, i.e., what injection ratio is required if they are to lock within 1/3 of their pulse lengths? If their rise time is Q cycles of the 3-GHz frequency and they are to lock within the rise time, what injection ratio is required?