I have a custom board using a CC1200, a CC2500, and a LSResearch TiWi module. I am sampling data from the ADC and am picking up noise during the 900MHz CC1200 transmit. It completely shifts my steady state voltage. It also appears that this is entirely radiated. I can put a cable on and move the antenna 50 feet away and it goes away. I can also put the board in an environmental chamber and run the antenna outside the chamber and see that the problem significantly disappears but when I move the antenna back inside, the problem greatly appears. I have tried filtering everywhere possible. I have added shields over every radio. Adding high frequency caps at strategic points. I am lost and would appreciate any ideas.