Hey all
I've had this issue with my 50s, 1 is 3 & 1/2 years old the other is 1 & 1/2 years old. It can happen on a cable or on Lectro HM transmitter. I swap to a scheops Cmit 5u and no probs. We have a lot of 2.4ghz traffic (focus remotes, red remotes & HD senders) from camera department and a relatively small lighting set up. I notice this problem in 2 sets, it drives me crazy as it seems to be happening more often recently. I'm sending both 50s back to sennheiser for an inspection when we wrap in 4 weeks. I've spoken to our post crew who aren't too bothered by the noise... but it drives me nuts when I end up with it on a take. As we're using Red Epics on our shoot, you can only just hear the actors over the fans during rehearsal, there's no chance you'd hear this noise. As a note, i'm using canare quad cable and neutrik EMC connectors.
Cheers
Mark