Microphone Bias Voltage Requirements; Headset Power - Telex Stratus 50-D User Instructions

Microphone Bias Voltage Requirements

The boom microphone operates on a voltage of 8-16VDC. Output impedance is 50
Ohms (designed for radio input impedances from 50-600 Ohms). If you are uncertain
whether you avionics equipment meets this requirement, consult the avionics
equipment manufacturer.
The cellular telephone/auxiliary audio interface of the Stratus 50-D relies on this
same microphone bias voltage for operation. If less voltage/higher impedance is
normal in your system, this interface may not operate properly. If unusual or
unacceptable performance of the boom microphone or cellular/audio interface is
discovered, the cellular/audio interface should be disabled using the accessory mute
(described later in this manual).

Headset Power

The headset operates with either 4 AA batteries or panel power from 8-32Vdc.
Panel Power Option
An optional power cord is provided for use in negative ground electrical systems only.
Do not attempt to use with positive ground electrical systems. The power cord is
designed to connect the battery module to the aircraft power via the cigarette lighter
jack.
Inside the jack is a 250V .5A fuse. If, after pushing in the plug, the green LED (see
Figure 11), does not illuminate upon switching power on, the fuse may be bad.
To replace the fuse, do the following:
Unscrew the serrated knob from the jack.
1.
Tip the open end of the jack to allow the fuse to fall out. See Figure 2.
2.
Insert a new fuse.
3.
Replace the serrated knob on the jack.
4.
5