Proximity between IEM transmitters and wireless receivers

T

TJ Cornish

Graduate
Jan 13, 2011
1,263
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St. Paul, MN
What are the rules for distance between IEM transmitters and wireless mic receivers? In my case, the IEMs would Sennheiser IEMG3s in both A and B ranges, and the wireless mics would be Line6 2.4Ghz. Can these operate in the same rack since the frequencies in question are substantially different?
 
Re: Proximity between IEM transmitters and wireless receivers

TJ Cornish said:
What are the rules for distance between IEM transmitters and wireless mic receivers? In my case, the IEMs would Sennheiser IEMG3s in both A and B ranges, and the wireless mics would be Line6 2.4Ghz. Can these operate in the same rack since the frequencies in question are substantially different?
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I all depends ... but it's not a good practice. Even though the frequencies are way apart, it could cause a big problem. It's like speaking normally isn't loud ... but if you speak normally directly into someone's ear it becomes screaming.


I'd highly recommend using remote antennas on one or the other (or both)
 
Re: Proximity between IEM transmitters and wireless receivers

TJ Cornish said:
What are the rules for distance between IEM transmitters and wireless mic receivers? In my case, the IEMs would Sennheiser IEMG3s in both A and B ranges, and the wireless mics would be Line6 2.4Ghz. Can these operate in the same rack since the frequencies in question are substantially different?
Click to expand...

It's not so much a question of the proximity of the electronics as it is the antennas. It's perfectly fine to mount the mic receivers and IEM transmitters in the same rack (separated by a few rack spaces). But the antennas for the respective systems should have some physical separation. I've not done out of band emissions susceptibility testing of the Line 6, but I'd bet they're pretty deaf two octaves away. That said, if the antennas are too close, you might find the receivers vulnerable to IEM frequencies exactly 1/4 of the tuned mic frequencies if strong enough harmonics are generated in the transmitters.
 
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