Two harmonic signals at frequencies up to 400 MHz are necessary with the same frequency and with the ability to adjust the phase shift between them.
M9383B or M9384B with option 002 is probably over kill.
I'm not familiar with the P9336A AWG. However, based on the data sheet you could produce signals you described. You might have to create the waveforms needed by each channel in the AWG.
Hope this helps
Can you the P9336A AWG be considered a good solution?
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