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RF Hell
Old 3rd July 2005
  #1
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neve1073's Avatar
 

RF Hell

I was recording someone's vox today with the following signal path:

E47/ neve1073/ purple mc77/ DAW

I've used this signal path many times with the same cables in the same room, but for the first time was getting some noticable RF. With the exception of the E47 cable, the cables are mogami. I took the purple out of the chain--still rf, but less. Tried another mic with a power supply into the neve--still rf. Then tried a ribbon and a dynamic--no noticable rf. The ac to the room has its own circuit breaker which is grounded/earthed physically.

Any idea why, all of a sudden there is rf? What are the best cables to use to avoid rf?

Thanks
Old 3rd July 2005
  #2
Lives for gear
 
brianroth's Avatar
 

I've had problems with Soundelux mics at a local studio here. They want to pick up the "classic rock" station at 107.7 mHz! I discovered that careful routing of the cable between the mic and power supply would "null" out the RF. The best case was coiling the excess into approx. a 6" circle and setting the supply on top!

No other mics in that studio have any RF problems, BTW. It seems to be only Soundelux mics.

Bri
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