Picking up radio frequencies when my mixer is on

[Jsn7821]

I have my eurorack mixer going into a delta 1010lt, then out to my soundcard and to my speakers.

Somewhere along the chain I am picking up a radio frequency, I have a lot of radios in my house but turning them off or changing the channel doesn't affect anything. I have an LCD monitor and a tube TV about 10 feet away.

 

[bennychico11]

are you using balanced cables? and/or running your audio cables near/parallel to electrical cables?

 

[MadAudio]

It's called RFI (radio frequency interference) and it doesn't have anything to do with radios being on or off. The signal is coming through your electrical supply. You can try moving things around until it goes away (often impractical) or get something like a Furman power conditioner that filters out RFI.

 

[x147902]

Operator: We Get Signal.
Captain: What!

RFI is often difficult to track down. Is it a commercial station or something intermittent? You can visit the happy and friendly folk at your local Radio Shack [gag] and pick up some snap on RFI chokes. Try the line cord first, then your audio input or output cables. If the offending source is very strong, the rf may be getting into the devices circuitry itself.

Try looking here:

http://www.fcc.gov/cgb/consumerfacts/interference.html

 

[Chico]

Some things you'd like to consider:

I use to have a Shure SM58, good cables, good mixer, etc. One day I set up all my home studio connections and there it was: RFI. I could listen to the radio station as it was just a mile way. I tried everything: changing cables, using power stabilizers, etc. I extended the cables (having them partially rolled turn them into a coil, easy to be affected by an electro-magnetic field). But nothing changed. At last I got my old cheap microphone and "voilá", it was gone! Later I found out that my mic had some problem. I borrowed it to a friend to test and same problem happened. So I bought a new mic and never again I had this kind of problem.

 

[Dani Pace]

Do you have any efx boxes plugged into the mix anywhere? If you are cloce to a broadcast tower these things pick up the signal sometimes, especially if you use an adapter for a power source.