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1584 Views 4 Replies Latest reply: Sep 4, 2010 7:13 AM by charlesvk RSS
charlesvk Just Startin'
charlesvk
14 posts since
Jul 19, 2010
Currently Being Moderated

Sep 1, 2010 12:57 PM

rrrrrrrrrr?

Hi,

 

Today I received my two XD-V70L´s. That´s great, they look and feel good and rugged!

 

While installing and testing them for the first time, I noticed that under a certain angle the microphone(wire) of my headworn microphone - a Beyerdynamic Opus 54.18 - picked up the antenna of the beltpack, resulting in a what I would call a digital like rrrrrrrrrrrrrr-tone. Is this normal (I sure hope not) and/or what to do about it?

 

And one other thing, there is an audible effect of the mute, which sounds the same as when you turn the beltpack off - a soft "thuh". Why does it not mute-mute?

 

Kind regards,

 

Charles

Tags: wireless, antenna, xd-v70l
  • dboomer Line 6 Support
    dboomer
    1,997 posts since
    Oct 13, 2008
    Currently Being Moderated
    Sep 1, 2010 8:15 PM (in response to charlesvk)
    Re: rrrrrrrrrr?

    That would be not unexpected.  Lav mics are single ended ... not balanced like 3 pin xlr mics.  It's telling me that you have a less than perfect shield in your mic cables.

     

    It's usually related to how close the cable and the antenna are.  Try routing the wire farther away and maybe roll up the slack.

    • charlesvk Just Startin'
      charlesvk
      14 posts since
      Jul 19, 2010
      Currently Being Moderated
      Sep 3, 2010 4:09 AM (in response to dboomer)
      Re: rrrrrrrrrr?

      If you mean the cables between the receivers and my console; they are good, balanced XLR-cables. My two receivers are built in a 19" rack, the two antennas of the first unit are front mounted and cascaded on the back of the first unit into the second unit and the "end plugs" are screwed on the antennas out of the second unit. The XLR cables run straight back, away from the antennas. And the antennas are pointing in different directions.

       

      If you mean the cables of the headworn mics (Beyerdynamic Opus); I don´t think there is anything wrong with those. By the  way, your lav mic is showing this artifact as well. You are not telling me that  you are selling less than perfect mics now, are you?

       

      And am I correct that the audible effect of the mute and the turn off function is the same (so it wouldn´t matter whether I turned it off or muted it) or is there a difference?

       

      Thanks,

       

      Charles

      • dboomer Line 6 Support
        dboomer
        1,997 posts since
        Oct 13, 2008
        Currently Being Moderated
        Sep 3, 2010 7:54 AM (in response to charlesvk)
        Re: rrrrrrrrrr?

        Yeah ... unfortunately "perfect" isn't possible.  What is happening is the the output from the transmitter will penetrate the cable of the mic and then "feedback" inside the system.  It always happens with all radios to some small extent. It will also happen if you get similar transmitters next to it ... such as cell phones. Since the cables on lavs and such must be thin and flexible and because they are not balanced like regular gear it is impossible to keep out all interference.  Some cables are better than others at avoiding this interference.  We worked with a number of alternate cables before deciding on the one we supply and  found the cable used on our lav to be very good at rejecting this type of interference in testing ... but it still can end up in the wrong place an pick up some noise.

         

        So what you are left with is "best practices".  If you do not need more than 100-150 feet of range I would suggest that you switch the transmitters down to "low" power.  The other thing to do is what I mentioned before ... do your best to route the cable away from the antenna.

         

        The "practical" difference between muting and powering down is that it will take a second or two to power back up while un-muting is instantaneous.

        • charlesvk Just Startin'
          charlesvk
          14 posts since
          Jul 19, 2010
          Currently Being Moderated
          Sep 4, 2010 7:13 AM (in response to dboomer)
          Re: rrrrrrrrrr?

          Well, switching to low sure does the trick! It´s great; I hear nothing of this interference anymore.

           

          I got worried of course, but especially because we will be using these for our music theatre productions where in a number of scenes you hear nothing but a single voice.

           

          (Perhaps it´s an idea to set the default setting to low?)

           

          Thanks,

           

          Charles

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