Because in this after noon I happened to be around the ISC rack with an RF source in hand, I measured and adjusted the IQ balance of the 3f demodulator which had been refurnished recently. I did the same process as was done a month ago (see alog 9100).
Here are the new settings for it:
Note that I didn't change the gains for the RF27 I and Q paths because the gain difference was smaller than 1%.