NASA NTRS · 19750000254
Portable headset microphone checker
Abstract
Simple and reliable test system gives go/no-go indication of output level of headset microphones. Portable system has its own internal battery power supply and can be used in field or in laboratory with wide variety of headset types.
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Davenport, J., Foster, J. A., Langley, W. R.. 1975-10-01. Portable headset microphone checker. https://ntrs.nasa.gov/citations/19750000254
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