So, it appears that one doesn't even have to change the Marconi set frequency to alter the phase of the output signal. It appears that other front panel actions (turning external modulations on/off, changing the modulation type) can do it as well. At least that's what I conclude from earlier this morning, when after setting up the f2 Marconi (166MHz) for external AM, the double-demod handoff in the DRMI no longer worked. Luckily this isn't a real problem now that we have the setDDphases and senseDRM scripts.
The real problem is that we are using frequency synthesizers to make the beat signals (133 and 199) instead of mixers. Luckily, the future 40m will not use beat signals (?) or synthesizers.