Telex 50-D Microphone Bias Voltage Requirements, Headset Power, Panel Power Option, Battery Power

Microphone Bias Voltage Requirements

The boom microphone operates on a voltage of 8-16 VDC. Output voltage is 50 ohms (Designed for radio input impedances from 50-600 ohms). If you are uncertain whether your avionics equipment meets this requirement, consult the avionics equipment manufacturer.

Headset Power

The headset will operate with either 4 AA batteries or panel power from 8- 32 Vdc.

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.

Power Cord

450 Locking

Figure 2

Panel Power Option

Battery Power

The battery module requires 4 AA Batteries. Alkaline batteries are recommended for best performance. Do not use nickel-cadmium rechargeable batteries or lithium batteries.

1.Slide the battery door down in the direction of the arrow, then up to rotate the battery door (Figure 3).

2.Place the batteries into the battery module as shown.

3.Slide the battery door back into place.

Figure 3

Battery Installation

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