Prahlad Strickland

Zaxcom QRX 200 D-Tap buzz problem

9 posts in this topic

I had a D-Tap cable made up for my QRX200,  if i tap from the vlock on camera I get a horrible buzz in both channels.  If I D-Tap a separate V-Lock the buzz is gone,  seems like sharing camera power and the QRX 200 is causing some problems.  The camera is a RED Raven.  It has 2 D-Taps,  one powers a zacuto gratical EYE, the other is on the battery and I want to power the QRX200 with that.  

Definitely don't want to have to use another source of power,  any ideas why i'm getting a buzz?

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Ive had a similar issue with the Zacuto viewfinder - it creates some sort of ground loop.

If you disconnect the viewfinder things should clear up - but unfortunately it becomes a sound problem and not a camera problem so the Zacuto stays and the wireless goes.

 

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The hi pitch noise is still there regardless if the Zacuto is plugged in.  Sometimes when I plug the gratical in there is an extra noise.    I wonder if for instance I dtapped a battery buds and forwarded power from there to the qrx.  I wonder if that would isolate it.   Or if there is a way to wire up a d-tap that could work.    

Also strange. Sometimes the noise is left only. Sometimes it's in both channels    

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If camera input is not balanced this would be a ground loop problem. Call me in the office if I can help.

Glenn

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Try lifting the ground on the audio cables out from the QRX. I had this with a C300 and the same powering setup, I snipped the ground on the XLRs and buzz was gone, audio was good!

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I snipped the ground wire on the QRX connector end,  still buzzing the same. I'll call Glenn and see if we can come up with a fix,   makes ENG work a trip, for now we just tapping from an additional battery mounted on a rear rail.  Hoping can fix and go back to d-tapping from the main batt.

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14 hours ago, Prahlad Strickland said:

I snipped the ground wire on the QRX connector end,  still buzzing the same. I'll call Glenn and see if we can come up with a fix,   makes ENG work a trip, for now we just tapping from an additional battery mounted on a rear rail.  Hoping can fix and go back to d-tapping from the main batt.

Interesting. I did snip on the XLR end, not sure if that would make any difference though. 

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On 11/22/2016 at 10:10 PM, Prahlad Strickland said:

I'll call Glenn and see if we can come up with a fix,   makes ENG work a trip, for now we just tapping from an additional battery mounted on a rear rail.

Did you ever come up with a fix that let you get back on the camera battery?

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no fix yet no,   not sure where the problem is coming from.  works on an arri mini, doesn't work on the dsmc 2 bodies.   I'm still putting the blame towards zaxcoms direction since lectro works on both :-P

No I can't say for sure,  I need to call Glenn and try again get it working.

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