Yesterday, I measured the ISS 3rd loop while we were locked at 40W.  This is motivated by the fact that we can't increase past 40W without seeing this loop go unstable (see alog 28482). 

This measurement was taken before the PRM was moved, so the recycling gain was very low (~25).  Still to do is measure the 3rd loop after we recover the recycling gain. 

The screenshot shows Kiwamu's 20W measurement in blue (alog 27940, note that the phase is wrong by 180deg), and the new 40W low recycling gain measurement in red (red and unseen green are same).  Interestingly, the gain at the peak is much higher at 40W than it is at 20W.  I'm not totally sure why that is.  Loop still looks stable though, so I don't know why it would go crazy with another couple of Watts.