TECHNICAL INFORMATION
Sound pressure levels (SPL) are relative to 20 micropascals.
Headphone | Damage could occur to avionics equipment |
| that is intended for use only with |
| headsets. If in doubt, consult the avionics |
| equipment manufacturer. |
Impedance | Monaural mode: 160 ohms (ON) and 230 |
| ohms (OFF) at 1 kHz |
| Stereo mode: 320 ohms (ON), 460 ohms (OFF) |
Frequency | 15 Hz to 15 kHz |
response | Sensitivity: 90 dB SPL typical, measured at |
| |
| 1 mw, 1 kHz, full volume on KEMAR ear |
| simulator |
Microphone | Bias required: 8 to 16 VDC through 220 to |
(Electret) | 2200 ohms |
| Sensitivity: Varies depending upon bias and |
| radio AC input impedance. Typical output is |
| 600 mV at 114 dB SPL. To assure proper |
| modulation of the radio, it is recommended |
| that an avionics technician adjust its input to |
| match the output of the microphone. |
Microphone (Dynamic)
Maximum ambi- ent noise level
Power source
Battery life
Current
Fuse/breaker recommended
Impedance: 5 ohms
Sensitivity: Equivalent to
115 dBC and 105 dBA SPL
Battery powered: 2 AA alkaline, IEC LR6
Aircraft powered: 10 to 32 VDC
Alkaline: Up to 40 hours in typical general aviation aircraft noise. Battery life varies with ambient noise level, temperature, ear cushion condition and age of batteries.
Operating: 25 ma in typical aircraft noise
32
