KM184 RF Interferience
 

I am getting RF interferience on my KM184. I purchased it used and I get quite a bit of RF interferience from it. Once for a few seconds every 5-10 min or so. It makes it unuseable because I loose takes and shots that cant be done again. I need my cabled mics to never have this problem. I read somewhere on another forum that the older KM184's had this problem but offered no solution.

Is there something I can do to fix this? Get it repaired? Ive never had this problem with a cabled mic before.

maybe this?

Shure - A15RF In-Line RF Interference Attenuator



the sound i am getting is similar to when your cell phone is about to go off next to your clock radio. its a soft beeping type sound. I have assumed this is RF though I dont know much about it.

I found an example and uploaded a 18 second clip:

YouTube - Audio Problem KM184

Explain the problem to Sennheiser / Neumann USA, it may need looking at.

Check your cables - many RF problems can be cables or mixer.

Change the cable XLRs to the Neutrik EMC XLRs (this is what I am doing now to all my cables). The EMC XLR has a ferrite bead on pin-1, a ring capacitor that connects pin-1 to the shell and a toothed ring round the female for good connection.

The Canford Audio XLR In-Line RF Filter is excellent and I always carry a few with me. Used at the miser end (rather than at the mic. end like the Shure one).

Also - consider changing the mic. cable to star-quad (I use this type for all my mic. cables).

I hope this helps.