- The 38T cancels noise best when held very close to the mouth, and it discriminates against all sounds more than ½-inch away. A position at one side of the mouth is best to minimize popping, hissing and breathing sounds when speaking.
Microphone Gain Adjustment
- The gain is adjustable through an opening in the side of the microphone housing using a small, flat-blade screwdriver. Clockwise rotation of the control increases gain. Adjustment by a qualified avionics technician is recommended, as excessive gain can cause transmitter overload distortion.
FAA TSO Approval
- The 38T microphone is certified for aviation use under FAA TSO C58.
|Microphone Sensitivity||-45 - -51 dB (re: 1 V / μbar @ 1 kHz, 12 VDC)|
|FAA TSO Approvals||C-58|
|Connector Type||PJ-068 or XLR-4-12C|
|Retracted||~11.5 in (292 mm)|
|Extended||~6 ft. (1.8 m)|
|Weight||~8 oz (227 g)|
|Microphone Type||Close Talking Differential, Electret Element|
|Mounting||External Diameter Mount|
|Frequency Response||300 Hz – 3 kHz|
|38T EC Declaration of Conformity||101KB||Nov 6, 2014|
|38T FAA TSO Approval||56KB||Nov 6, 2014|
|38T Technical Data Sheet||EN||277KB||Nov 6, 2014|
38T Speaker Close
|Maintenance & Overhaul Manual Publication Index||EN||74KB||Jan 4, 2021|
|Headset Cleaning Memo||84KB||Jun 12, 2020|