Jeremy,
I did actually find that info on E field measurements in the "big" manual, section 4, page 60. It is the same procedure but written slightly differently due to the different format of the manual. Your guidebook is much nicer
Lex, IIRC the cal output adjustment is maxed on mine as well, and I think I still can't get quite -20dBm from it. This is yet another thing I need to work on once it's running. Looking at figure 10-8 on page 10-9 I see a few amplifiers used in the calibration generator circuit. Also, the RF chain gain/loss diagram on page 10-14 should be useful.