Sounds like you might still be using the RU890, but putting the signal through an RF extender. Am I right?
Does the RU890 still control the equipment via IR
Did you program the RU890? Did you set the part of the file that controls the QUAD to send RF signals?
A good answer is easier with a clear question giving the make and model of everything. "The biggest problem in communication is the illusion that it has taken place." -- G. “Bernie” Shaw