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Microphone Bias Voltage Requirements
The boom microphone requires a bias voltage of 8-16 VDC through 300 to
1000 ohms. If you are uncertain whether your avionics equipment meets
this requirement, consult the avionics equipment manufacturer.
Optional Aircraft Power Supply Module
The power supply module is designed for use in negative ground electrical
systems only. Do not attempt to use with positive-ground electrical systems.
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Installing a Battery in the Optional Battery
Module
The battery module requires one 9 volt battery. Alkaline batteries are rec-
ommended for best performance. Do not use nickel-cadmium recharge-
able batteries or lithium batteries.
1. Slide the battery door over in the direction of the arrow, then up to
remove the battery door.
2. Snap the battery onto the battery connector and place the battery into
the case.
3. Slide the battery door back into place.