Whine in wireless mic

  • Thread starter Thread starter Pbergin
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Pbergin

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I recently bought some uhf wireless mics to use for horns and vocals. The ones for the horns work fine, but the headset mic has a high pitched whine. When I touch it the whine disappears, which I guess means it has something to do with body capacitance or grounding. I've attached an audio file that demonstrates this.

Can I fix this somehow? Thanks
Pat Bergin
 

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That's nasty. In all my years I've never heard that. Sounds though like processor whine. What make is it - I wonder if it's something daft like a screening can inside not soldered properly - dry joint or maybe physically cracked from a drop. I wonder if opening it up and prodding would reveal where it's coming from?
 
Pbergin said:
I recently bought some uhf wireless mics to use for horns and vocals. The ones for the horns work fine, but the headset mic has a high pitched whine. When I touch it the whine disappears, which I guess means it has something to do with body capacitance or grounding. I've attached an audio file that demonstrates this.

Can I fix this somehow? Thanks
Click to expand...
It’s definitely a grounding issue - and I would assume in the transmitter - but when you grab it it’s quieter but still present to my ears - maybe it’s a defective unit?
 
Don't know, I thought it was grounding, but the area I touch on the unit is covered in plastic. That's why I thought it was body capacitance. I don't get it
 
Pbergin said:
Don't know, I thought it was grounding, but the area I touch on the unit is covered in plastic. That's why I thought it was body capacitance. I don't get it
Click to expand...
Well it could be a matter of an open circuit that is closed when you press on the box - is it too late to return them?
 
I think you're right - it is grounding but in the sense of a screen - so the little tin can doesn't offer proper screening unless grounded, but you hand serves the same purpose, with us being mostly bags of water.
 
I have read of this before, there is poor or no continuity between pin 1 and the mic body. Could be a wire off but what I read was that the plating was insulating and needed a scrape with a sharp blade.
Do we have a make and model?

Dave.
 
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