I'm trying to control 6 cable boxes with a MRF-300 and a MX850, i addressed the ir ports 1-6 per cable box and there still all changing at the same time. taped the ir flashers and still happens. any ideas?

Did you change each device to RF only?

havent done that yet but the equipment is in another room i didn't think that it would matter.

Make sure they're taped really well, no cracks etcetera. As well, sometimes IR can bounce of the inside of the unit and back out the smoked glass of a front panel. You might have to put a large piece of tape to stop this from happening. Keep trying on one unit until you get it right.

I've had to off a few inches on all sides of the flasher before on some models of DSS units with larger smoked panels. PITA, but not bad with nice grey duct tape and a sharp razor.

As a test before you spin wheels on it, put a dish towel over the front of the unit to make sure it's IR blasting that is your problem, even though it seems you set the 300 properly.

Yea when controlling multiple cable boxes, I have to cover the entire plastic window with tape. You can't cover just the emitter. The cable boxes look like they were broken in half and I had to tape them back together when I'm done taping it up :) lol

Shut off the blaster, that has to be the problem. Even though your set to RF only, the blaster on the 300 is flooding the room with IR signals which is changing all your boxes. Make sure it's set to RF only for each device, and situate your components so that they can't share anything from the emitters. Someone suggested taping them down, a good idea.

VB

Forgot about that, good call. I'd also suggest turning the IR output down too.