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The Magic Cafe Forum Index » » F/X » » "Quacking" distortion on my wireless headset mike. (0 Likes) Printer Friendly Version

Alan Munro
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Inner circle
Kentwood, Michigan, USA
5771 Posts

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During the weekend, I was using my new wireless mike, for the first time. The sound check went without a hitch and the mike worked well for making announcements, many of which were made from the stage. The problem was that as soon as the show started, so did the distortion on the higher pitches in my voice. I was sounding like Donald Duck and the distortion got so painful that I had to drop the volume to next to nothing - still no luck.

I've been running tests on my system and still can't find the cause. I thought that the metal frame of the stage might have an effect, but it was there during the sound check. The windscreen made no difference. The remote key fob for my car didn't affect the transmitter. The EQ is the same as during the show, yet there is no problem, now.

All I can think of is that there might be another radio signal causing problems, but it should have surfaced during the sound check.

Any ideas?
Father Photius
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Grammar Host
El Paso, TX (Formerly Amarillo)
17198 Posts

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Most likely it was interference from a sideband radio transmitter. Sideband transmissions without a carrier being reinjected sould like donald duck. If it was intermittent then most likely it was coming from a nearby sideband transmitter. A lot of CB sideband radios are illegally powered with linear amplifiers and will bleed into other radios. High power and linear amplifiers are the most common form of interference with most modern electronic equipment. Legal Linear amplifiers are filtered to prevent this, but the linear amplifiers sold for illegal CB amplification seldom have those.
"Now here's the man with the 25 cent hands, that two bit magician..."
Alan Munro
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Inner circle
Kentwood, Michigan, USA
5771 Posts

Profile of Alan Munro
The staff at the banquet facility did use radios to keep in touch. I think I'll change the frequency on my mike.
disneywld
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Special user
Denver, CO
614 Posts

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Well Photius has it right - what frequency and brand are you using? There can also be a problem of other wireless sets nearby on your frequency. (N3HQ) (My ham license)
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Alan Munro
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Inner circle
Kentwood, Michigan, USA
5771 Posts

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I'm using a Gemini system set at 790.375 MHZ. The mike has 64 channels to choose from between 790 and 806 MHZ. I'm thinking about reprogramming it for something in the middle of the range. Could the squelch calm this interference?
Alan Munro
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Inner circle
Kentwood, Michigan, USA
5771 Posts

Profile of Alan Munro
I think I found the problem. I got a new headset from Gemini, and it lessened the distortion, a little, but didn't take care of the entire problem.

I turned the gain way down, and the problem disappeared. It turns out that I project my voice much better on stage than in a sound check, and that's why the distortion didn't appear until the show started. Unfortunately, the manual doesn't mention gain in the troubleshooting section. The mike worked well in a recent performance, and I'm putting it back in service.

I cranked up the volume on the receiver and the amp to compensate for volume drop from the lower gain.
The Magic Cafe Forum Index » » F/X » » "Quacking" distortion on my wireless headset mike. (0 Likes)
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