HI
we developing new PLC communication module.
we have use high power OP-AMP OPA561 for transmission control . i successfully communicate full duplex mode on only few meters like (10meter) i have to improve our design to above 100 meters any possibilities available in improve my PLC communication module help as.
1565.CPX2.REV_2_20.05.2014.pdf
For reference here attached schematics.
and how to calculate maximum gain for OP amp