• Panasonic Cameras

  Audio Hum HVX200 & LH900

  Posted by Jim on September 18, 2006 at 1:55 pm

  Problem: mechanical noise/hum when XLR audio cables attached to HVX 200 when an AC powered Panasonic LH900 LCD is hooked into component out.

  The physical set up:
  Battery powered HVX200 with XLR to audio input

  Jim replied 19 years, 8 months ago 3 Members · 6 Replies
• 6 Replies

• 

  Jeremy Garchow

  September 18, 2006 at 2:50 pm

  Did you put a ground lift on the ac for the monitor? You tried two different power supplies for the monitor, you said?
• 

  Jim

  September 18, 2006 at 3:18 pm

  Jeremy:

  Thanks for the quick response re: ground lifter.
  Good thought, but didn’t work. The hum is still there.

  Yes, I did try powering the LH900 with both an NRG and and Aspen power supply.

  Also, Just for grins I pluged the camera composite out to the LH900 video in and there was no hum. However, when I touched the XLR connector there was a tiny click and a slight increase in white noise.

  So, major spotlight on the component cable system, and still a shielding problem.

  Thanks again,
• 

  Jeremy Garchow

  September 18, 2006 at 3:34 pm

  We use a 900 with an HVX but we run exclusively off of battery. We have two trim packs just for the monitor that are on a constant cycle. If we are out far on location with no power we also have some regular anton’s that we can sacrifice if not running a big body camera, if we need more battery we just rent. Sorry to say I have not tried to power the monitor with AC, but if I find something that works, I’ll let you know. The component cable does leave a little to be desired on the HVX.

  Jeremy
• 

  Gary Adcock

  September 18, 2006 at 11:59 pm

  [Jim Cunningham] “Thanks for the quick response re: ground lifter.
  Good thought, but didn’t work. The hum is still there.”

  Jim

  Did you try the choke that came with the HVX200?

  panasonic includes a magnetic choke as part of the HVX’s basic package, and it is intended solve this issue when using AC power instead of the batteries.

  gary adcock
  Studio37
  HD & Film Consultation
  Post and Production Workflows
• 

  Jeremy Garchow

  September 19, 2006 at 12:48 am

  I thought the ferrite core was for connecting the firewire cable straight from the cam to a pc?

  Jeremy
• 

  Jim

  September 19, 2006 at 1:56 am

  I too thought the ferrite core was for connecting the firewire cable from the cam to a pc, but It’s worth a try. I’ll let you know how it works out.

  Thanks again for your insights.

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