See TPC1 ;-) I measure IP3 too. I have two signal generator ;-)
You wrote: LO level -3dB to 0 dBm -is to big. When you have output transformer you must multiply voltage by sqrt(8) for example 0,224V (0dBm) after multiply is 0,63V. AD831 is sensitive on input voltage. When you have typical -10dBm (figure 9) it's only 0,07V. Please send me your e-mail. My email is sq4avs(at)gmail.com
You wrote: LO level -3dB to 0 dBm -is to big. When you have output transformer you must multiply voltage by sqrt(8) for example 0,224V (0dBm) after multiply is 0,63V. AD831 is sensitive on input voltage. When you have typical -10dBm (figure 9) it's only 0,07V. Please send me your e-mail. My email is sq4avs(at)gmail.com