You do need to be careful re blanket statements regarding wireless intercom. IF you go with complete wireless setup including their transmitters and receivers, you can be sure that there has been a lot of testing re interference, but these systems in the us require you to be licensed by the FCC because these work in special frequencies.
ON the other
hand if for instance you use the
adaptor system to add a walkie talkie or some other radio
http://www.beltpack.com/simplex.htm
you need to be more careful since the radio part of the
system is completely at the users option and could cause problems, more likely on the audio wireless mic side of things.
I would say that the likely hood of causing a problem on the lighting side is reduced but if for instance you put the radio transmitter right next to the lighting
desk, depending on how well it was made it could possibly cause interference to the cpu or logic
system in the
desk. If you were using it for wireless com to the fly then placing the transmitter well away from the
desk would certainly minimize/ eliminate this risk. Problem is people tend to just pile all this stuff up all around the
desk for quick
portable setup.
The integrated and fully tested and licensed systems work well, are expensive and fully tested, once you move over to the interface to provide your own transmitter, then you are somewhat on your own.
Sharyn