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Oxy mask connection
When connecting the oxygen mask microphone U173/U to the microphone cord with a U172/U connector, are these pins polarized or can they be plugged in either way? It is just grounding the mic. wires. I can't see how they could be polarized. However in some airplanes when I plug into the airplane all is good and on some airplanes when I plug into the airplane squealing results. Me or airplane?? Am I looking at the wrong thing? Could it be airplane wiring?
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Seems like if polarity was important, they would have designed the individual posts differently. In this shot, they look identical
![Name: u173u.jpg
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Oddly, on another shot I took, the posts are actually different...but STILL not different enough for a polarization guide.
![Name: u172_2.jpg
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If you can, in the squealing cases disconnect the U173 and turn it the other way.
Ron Wanttaja
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If it's an old fashioned carbon or dynamic microphone, polarity shouldn't matter. If it's a modern electret mike, polarity will matter.
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