If I'm not mistaken the Xenyx 802-8 is balanced input, and unbalanced output. The same with the Eurorack UB1202FX that I have. I had hoped that it had balanced output but I was slightly disappointed to find out is was unbalanced.. None the less, if you use the Xenyx with a transmitter a snap on RFI choke can be used at the input (as close to the transmitter's input as possible). I have no problem with RF getting into my audio, and I have twisted pair on the input. That could be a result of the higher output level. But I still have a snap on RFI choke just in case (Radio Shack).
I have a simple balun for my audio chain. It converts the balanced line into unbalanced. (Figure 2 on the link below). Luckily the transmitter is line level input not mic level input. Currently, my output comes out of my EQ, and into the balun, then into the transmitter.
http://www.rane.com/note110.htmlI'm not using my board at the moment. There is not enough space on the desk for it.
I like Behringer gear. Some people hate it because it's cheap, but despite the price I don't see or hear anything bad about it. I have a rack full of Behringer gear. I have the Eurorack (currently out of the chain) , a voice processor (mic preamp), a digital effects processor. and an EQ. In that order in the chain.