2 of the 3 sim-83+ mixers on sma board i bought from a reputable vendor where bad at arrival. Not sure want to buy these again.?
I would go for ADE-42MH as first mixer an ADE-25MH as second and third. These are level 13 mixers giving a bit better isolation and IP3 at a bit higher price
For best performance you want to use level 23 mixers or even better but at 100$ a piece on a pcb that is to much for me. And then I even ignore the LO amplifier you need to drive them.
Forgot to mention. Do not drink strong coffee before manually soldering 0603 components
