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Thursday, September 26, 2013

Eliminate Microphone's Interference

Today, microphone became part of the important component to our transceivers.

Most of ham radio operators like to use voice operation than CW operation.

Sometimes we received bad report about our audio quality, not the signal quality.

Stock mic sometime is the best mic for most modern transceivers. Usually hand mic.

Some people prefer desk mic and some might use 3rd party mic.

We need to know what is type of microphones that we are using.

For me, I use elecret condenser desktop microphone. For months I've been wondering where did the mic interference came from.

I noticed that when I touch the mic body, hum sound will noticeable.

After a few days, I realized that the built in preamp was not properly grounded and the elecret condenser element body touches the body.

I managed to open my desk mic and ended with setting up a proper ground and also I have done a simple isolation between the element and body.

Now the hum sound gone.

Oh, bytheway my desk mic polarity was omni directional. Not uni directional.

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