Astrocom Model 11175A Military Aviation Headset with M-87 mic

Description

Astrocom Model 11175A Military Aviation Headset. Shipped with USPS Priority Mail.
This unit has never been used in flight. Its primary use was for speech communication research in a laboratory environment. It has no signs of wear. It was not a factory second. It is fully operational and functions as intended.
A headset with special concentration toward user comfort and high noise environment. Volume control is located on the left ear cup, is also easily adjustable.Constructed to meet military environment requirements.
Features -
EARPHONE - Military type H-143/AIC Dynamic
Impedance: 19 ± 2
Ω
@ 1 kHz
Frequency Range: 100 - 5000 Hz
Adjustable headband with thumbnut locking feature
MICROPHONE: - Military Type M-87 Dynamic
Impedance: 5 ± 1
Ω
@ 1 kHz
Frequency Range: 200 - 6000 Hz
Weight: ≤ 45 grams
Volume Control: 8 dB
CABLE - Retractile, six conductor, terminated with a U-174/U Plug.
Use of this headset for general aviation use may require an impedance adapter. Military to general aviation headset impedance adapters are available in low to high or high to low configurations depending on your particular needs. The high to low adapters are used for converting from general aviation to military setups while the low to high adapters allow military grade headsets to be used in general aviation applications.