I'm not sure i've heard of Robotec, but i amvery aware of the robotech/macross series... Man that was some good shit, one of the few great cartoons they showed on AFN when i lived in Germany (That and the Galaxy Rangers) Found a pretty cool site on em if you're interested in learning more:
http://www.robotech.com/
Basically it has to do with the same old Rigamarole, PLanet earth got there hands on a new technology to fight off an invading horde of Space aliens that were like 100 times the size of humans. As such the humans had to make this kick ass mecha's to combat them. THese mechas were awesome, could change form from a jet, to a full blown robot (like above) to a half-robot with wings. One of my fav japanamation series from the old school (besides FOTNS). Check it out, was pretty tight shit.