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    RLC-410 POE - Audio Hum

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    • Guest
      Anonymous last edited by

      Camera RLC-410 POE powered, experimental traffic surveillance. First audio hum problem solved. Camera tested fine. When fixed in position on a tree it emitted a loud audio hum. This was caused by an earth ground loop as the camera was screwed directly into the tree. I presume that internally the case is used as a common earth, thus it set up interference with the audio stream. Fixing a non-conductive board to fix the camera too solved the issue. Please look up earth loop on the internet to understand what this is.

      However, I still get a hum at night when the infrared lamps illuminate, as this goes away immediately daylight comes up. Anyone have any ideas of a fix for this? or is it an internal camera issue. It is not a software related problem as it appears in our main monitoring system Blue Iris as well as other systems.

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      • FongJeng Kum_34673838378
        FongJeng Kum last edited by

        Hi,

        I used to have this issue, but after I place a ferrite to the ethernet cable on the PoE injector and I don't get that humming sound anymore.

        You can give that a try.

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        • audrdem_38325325504
          audrdem last edited by

          Hi FongJeng Kum,

          Maybe you can explain in more detail how you do it. "place a ferrite to the ethernet cable on the PoE injector"???

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          • FongJeng Kum_34673838378
            FongJeng Kum last edited by

            This is the ferrite attached to the ethernet cable.


            IMG_20170725_190159.jpg

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            • audrdem_38325325504
              audrdem last edited by

              Sorry FongJeng Kum,
              But from attached picture, I can't understand what for ferrite do you use and how do you use it.
              Can it buy on ebay, or do it yourself? Maybe you can explain like for dummy 🙂
              Thanks in advance

              Audrius

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              • FongJeng Kum_34673838378
                FongJeng Kum last edited by

                Yes, you can buy that from Amazon website.
                I got mine for free when I purchased some devices that come with it.

                It's not an expensive unit.

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                • Guest
                  Anonymous last edited by

                  Audrius
                  A ferrite ring or clip on cable choke filters out unwanted high frequency noise signals (band pass filter) which can distort audio and other signals. It is simple, cheap and effective.

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                  • FongJeng Kum_34673838378
                    FongJeng Kum last edited by

                    Hope it helps for your end too.

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                    • audrdem_38325325504
                      audrdem last edited by

                      Thanks both 🙂

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