C200: Ground loop on C200 Audio

[brettsherman]

I just got a fancy new Sony URX-P03D dual channel UHF reciever. My hope was to send one wireless signal into XLR channel 1 and the other into the 1/8" mic jack. This gives me pot control of gain for the "main" wireless. But allows me to add a 2nd wireless transmitter as needed.

The problem is it creates a ground loop within the C200 so the 1/8" mic jack gets a significant buzz in it. I'm not sure which gear is at fault here, though I suspect the C200. I can get clean audio by sending both channels into the 1/8" mic jack. But the problem with that is I only have menu control over gain and I can't stream those audio channels via HD-SDI or HDMI.

Anyone have any ideas of anything that can be done to fix it?

 

[Run&Gun]

I don’t have a C200 or a good answer for you, but the C300 is notorious for a similar ground loop issue and because of it requires me to run the camera on the internal battery, my VF on a brick and if I put a wireless on it, it has to be powered by a separate battery, as well. Three different batteries on one camera. What a PITA. I can run my F55 with VF, wireless Rx, wireless video Tx, and an on board monitor all off of ONE battery with no issues, besides a heavy ass camera(Lol). If I power the VF and camera and wireless from the same battery: hum. If I power the VF and wireless from the same battery: hum. If I power the camera and VF from the same battery and go hardwired to the mixer: hum. The camera is just poorly shielded and I suspect it’s probably the same with the C200.