CGr, back in the early 80's, I worked at the IBM plant in Poughkeepsie Ny on the biggest of the current and underdevelopment mainframe computers. The RFI/EMIengineers had a special building away from the main plant site. For the most part, all of the test equipment and power stuff was below ground level The computer room floor was just about ground level and everythingabove the floor level other than the computer being tested was non conductive material. 10" fiberglass I beams supported the plastic wall and roof. All lighting was show up from the floor. Their instrumentation was so sensitive that they could tell how many cylinders a car had going down the road a quarter mile away. They had to shut down testing at shift change time because of he extra road traffic. They tested for both emitted and received RFIand EMI. It was very broad band testing from ULF into the Gighrz range. There were numerous engineering changes due to correct the emissions given and interference received. Nope, they didn't do cell phone testing, they weren't really available then.They did cover everything from radar interference from planes flying overhead to the cars going down the street. Electric drills and skill saws were also used near the equipment for both radiated and power line interference.

One thing i found both from field experience and my development engineering experience is that it alway the strange, couldn't happen source that causes the problems. The rest are engineered out already.

As pointed out before though, being distracted by your phone, or some one else's when flying is more likely to cause a problem than actual interference.

We did have a first hand incidence of static at the field a couple weeks back. We were getting ready for the Fun Fly and the wind was really blowing, and didfor the Fun Fly also. We have three picnic tables outside our trailer and theyare protected from the field by a chain link fence.
As the wind was expected from the fenced sides, we used the side covers from a temporary garage setup draped over the fence as a wind break for the table area. We were wrestling thethe first piece in place with the wind hitting about 20mph. and all of a sudden both the President and myself got almost knocked on our butts with the static charge thatbuilt up on the vinyl No one was flying, but I'll bet that spark would have caused some servo jitters. It sure jitter-ed us.

Don