Bullet Mic Review

Discussion in 'Accessories' started by nayr, Oct 3, 2016.

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  1. looney2ns

    looney2ns Pulling my weight

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  2. looney2ns

    looney2ns Pulling my weight

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    I will take the picture tomorrow.
     
  3. nayr

    nayr Known around here

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  4. JetG

    JetG Young grasshopper

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    I do understand how to use the 12V Splitter but that wouldn't work on a POE+ for the PTZ. Just curious to see how this one was hooked up, and might make me buy more Mics or just stay with the one. Was hoping to get at least one camera to record sound, but would be awesome if I could take that sound and make it universal for all the cameras by a setting in the NVR ?
     
  5. looney2ns

    looney2ns Pulling my weight

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    I see @nayr fixed you up for the most part.
    My mic and camera is still on my test mount. But when it's installed, I will pull wire to power the mic from a wallwart in my garage. Not powered from POE+.
     
    Last edited: Jan 10, 2017
  6. tangent

    tangent Pulling my weight

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    Just a word of caution, when you power a mic with a power adapter that's farther away / farther from the camera's power source you increase your odds of picking up interference. If you experience significant interference the key is to minimize the area of the ground loop. It may work just fine, it's just something to be aware of.
     
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  7. looney2ns

    looney2ns Pulling my weight

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    Thanks @tangent I was not aware of that. When you say "to minimize the area of the ground loop", can you explain that please?

    I will be powering the camera from it's 24v ac transformer, not poe+. I see that an injector at the camera won't work, and I've not be able to find an 24v AC to 12vDC converter to put at the camera. Any other tips appreciated. Thanks.
     
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  8. tangent

    tangent Pulling my weight

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    Ultimately for something like this it comes down to experimentation it may or may not be an issue with the devices and distances in play. In situations like this there's a ground loop between the 2 power supplies and devices. If you had 2 wires that created a loop and spread them far apart like a hula hoop the area of this loop would be relatively large. If the wires are close together as in a jacketed cable the area is much smaller but depends on the length of the cable (shielded cable helps). The twists in UTP cable also reduce loop area / parasitic inductance by introducing parasitic capacitance. The portion of the loop between the power supplies is probably the hardest to control.

    This mic has some internal filtering that may filter out a lot of the interference.

    Here are a couple links on the subject of ground loops:
    Ground loop (electricity) - Wikipedia
    http://web.mit.edu/~jhawk/tmp/p/EST016_Ground_Loops_handout.pdf

    Here's a 24vac to 12vdc adapter I found:
    Amazon.com: 24VAC To 12VDC Convertor For CCTV Security Camera Power Supply Adaptor: Home Audio & Theater
     
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  9. looney2ns

    looney2ns Pulling my weight

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    Thank you @tangent. My search fu is weak it seems. I really appreciate the help.
    Part ordered! Thanks again!
     
  10. tangent

    tangent Pulling my weight

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  11. JetG

    JetG Young grasshopper

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    Wonder if this mic could be Poe powered by the splitter and run it back to mic in on NVR. If that was done would it play sound for all the cameras on the NVR. Have the mic and splitter and wondering if I am stuck buying one for each camera and have 2 PTZs that I will need to also put mic's on as well.
     
  12. nayr

    nayr Known around here

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    no idea, kinda doubt it.. just play back both feeds in sync and turn the audio on the camera taht has audio.. if you really need to you can post edit it.

    all my cameas have there own mic's, even if they overlap.. provides better coverage
     
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  13. JetG

    JetG Young grasshopper

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    So on the PTZ how would be the best way to power the Mic since it is POE+.

    On the fixed it is easy, as just use the POE splitter, but the PTZ's not sure about ?
     
  14. nayr

    nayr Known around here

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  15. itservice

    itservice n3wb

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  16. nayr

    nayr Known around here

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    PTZ uses PoE+ and ~22-23W; the PoE to 12V Splitter does not passthrough PoE.. it splits out 12W of 12V and its not enough to power a PTZ let alone the Mic + PTZ.
     
  17. itservice

    itservice n3wb

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    Got it now thanks
     
  18. looney2ns

    looney2ns Pulling my weight

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  19. itservice

    itservice n3wb

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  20. nayr

    nayr Known around here

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  21. tangent

    tangent Pulling my weight

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    It's pretty easy...
    -Connect the 24 VAC power cable and the power adapter inputs to the power terminals on the camera
    -Connect the 12VDC out to the power connector on the microphone, if they're different sizes an adapter or some splicing will be required. Verify matching polarity
    -Connect the audio out from the mic to the camera, from the pics @looney2ns posted this camera doesn't have an RCA connector on the input so you have to splice something together. Something like this being the easiest option: Amazon.com: UHPPOTE 5 Pairs Phono RCA Female + Male Plug AV Screw Terminal Connector Video AV Balun: Home Audio & Theater
     
    Last edited: Jan 16, 2017 at 7:51 PM
  22. itservice

    itservice n3wb

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    I was going to use PoE+ for the PTZ
     
  23. nayr

    nayr Known around here

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    then you'll have to find another way to supply 12v power to the microphone..
     
  24. nayr

    nayr Known around here

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    Bought another one of these to replace a failed cheapo microphone, wanted to add some wind protection to em both so I got a pack of these: Amazon.com: Tetra-Teknica XFFZ5P-BLK Lapel & Headset Microphone Windscreen, Color Black, 5-Pack: Musical Instruments

    it was a tight fit, but it works :)
    IMAG0739.jpg
    wont come off easily but leave a lil slack on the end so there is a dead space infront of the pickup.. mine are installed protected from most of the weather.

    I find giving the microphone a downard tilt usually helps avoid the direct wind, it rarely comes from the ground level.. I dont expect this alone to completely cure wind noise, but it should dramatically reduce it without looking funky.. I dont live in a windy environment so it wont take much to make me happy.
     
    Last edited: Jan 17, 2017 at 8:07 PM
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  25. itservice

    itservice n3wb

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    Thanks
     
  26. looney2ns

    looney2ns Pulling my weight

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    Any noticable difference in voice pickup? We have lots of wind.
     
  27. nayr

    nayr Known around here

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    nope, I put one on the Ultra tonight and I cannot tell any difference in pickup.. its pretty still tonight so no functional testing to speak of yet, but ive used these before with good results, works better than styrofoam and there is no way around it.
     
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