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Speaker mic help PMMN4050A

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K2NEC

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So today I wanted to test out my Motorola PMMN4050A speaker mic. On Motorola's website it says that this is a noise canceling Impres mic. I went to my local tree lighting and some fire engines were passing sirens wailing. I keyed on an analog repeater and asked for an audio report. The other operator said he could hear me but only about 10% of the audio was my voice. I wanted to know if this is how noise canceling mics always sound? Did I do something wrong? Is it something in the programming that I might have missed or does it only work on digital? I am aware that in order to get the full noise canceling you must speak directly into the front of the mic so that the back mic doesn't pick up your voice. Any help on this would be appreciated.
 
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