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Strange Sweeping Interference

Discussion in 'Recording' started by CarlCraig, Oct 25, 2013.

  1. CarlCraig

    CarlCraig Active Member

    strange-frequency.jpg

    I hope I've posted this in the right spot. I was recording some dialogue (audio book) and, when listening back, noticed a strange interference. Hopefully you can see in the image, the noise starts up in the high range, slowly creeps down to about the middle and then sweeps back up again. it also started soft, got louder and then trailed off again. this was over the course of about 25 min. What could cause something like this? Surely were not picking up bloody satellites.

    We're recording on an imac using a rhode mic into a konnekt 6 desktop interface (firewire) and everything is plugged into a power conditioner. A Furman M-8Lx I believe.

    Any help/ideas would be much appreciated.

    thanks
    Carl
     
  2. kmetal

    kmetal Kyle P. Gushue Well-Known Member

    do you have the latest drivers for everything. are you running any other programs during tracking. are there cell phones, or wifi near you? how bout mic cables running along side power cables? do you live very close to an airport, or radio station? what about any funky adapters or anyting? has this ever happened before?

    do you belive in aliens? :) I can't tell by looking at it what it sounds like, but i've never had the problem your describing, the closes i've ever heard was a strange sweer sound while shutting down equipment in the wrong order.

    if you could post a clip it's be very helpful so we can hear the sound and hopefully isolate the cause. but the stuff i asked at the top is generally a good place to start for weird noises.
     
  3. CarlCraig

    CarlCraig Active Member

    Thanks for the reply. Just heading home after another session. Same thing happened today at about 2:10. And started again a little after 3:00. So we're thinking grow op? Something new in the area.

    I'll upload a sample of the noise a little later


    Sent from my iPhone using Tapatalk - now Free
     
  4. pcrecord

    pcrecord Don't you want the best recording like I do ? Well-Known Member

    Did you try without the furman ? Any electronic can go wrong...
    If it's not that, any electronic or electric in your house and neighbors can create EM field and disrupt your stability.
    Any radio station or radio amateur nearby ? CB antena ??
     
  5. CarlCraig

    CarlCraig Active Member

    Hey. Sorry I haven't responded. Today we went and tried a different power conditioner. A belkin pure av. Tried changing all the cables 1 at a time. Turned everything off in the house. And finally went n picked up another rhode nt2-a. Turns out it might have been the mic. Signal looks better. Just watching to see if that sweeping frequency pops in


    Sent from my iPhone using Tapatalk
     
  6. DSPDiva

    DSPDiva Active Member

    Also, make sure when setting up the cable, not to wrap it around the mic stand. It creates an antenna that would pick up anything transmitting signal nearby. I know a lot of people like to wrap it to look neat, but it's a common misconception.
     
  7. CarlCraig

    CarlCraig Active Member

    I think the cable is wrapped around the stand. Didn't even think of that. Will fix that tonight.

    Thanks


    Sent from my iPhone using Tapatalk
     

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