38T - by Telex


  • Noise Cancellation

  • 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)
Mounting External Diameter Mount
FAA TSO Approvals C-58

Warranty 3 years
Retracted ~11.5 in (292 mm)
Extended ~6 ft. (1.8 m)
Weight ~8 oz (227 g)
Microphone Type Close Talking Differential, Electret Element
Frequency Response 300 Hz – 3 kHz
Connector Type PJ-068 or XLR-4-12C


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