Telex Stratus 50 manual Microphone Bias Voltage Requirements, Auto Shut-Off

Auto Shut-Off

The Stratus 50 Digital contains noise-sensing features to measure ambient noise levels. When ambient noise levels are low for 5 to 7 minutes continuously, the headset automatically shuts off. This feature will prolong battery life and prevent discharge of batteries if the headset is accidentally left on after use.

Cellphone / audio interface

The Stratus 50 Digital includes a unique amplified interface allowing for the connection of a cellular telephone and an audio input simultaneously. This configuration allows the user to set up before take-off and eliminates the need to re-configure cords and equipment when operating the aircraft.

The other unique feature of this interface is the ability to obtain power from the aircraft’s communications system. This feature results in increased battery life for the ANR system while maintaining the benefits of an amplified inter- face. By amplifying the inputs, the Stratus 50 Digital allows the user to adjust volume level at the headset contributing to the ability to not need re-configur- ing while in flight.

The Telex Stratus 50 Digital cell phone / audio interface has been designed to function with the widest array of cellular telephones and portable audio devices. There are cell phones and audio devices on the market not designed to industry physical and electrical standards. These devices are not guaranteed to function properly with the Stratus 50 Digital headset.

Cell phone usage while in the air or under situations requiring full attention is not recommended.

Please see the Telex web site for additional information.

www.telex.com/aircraft

Microphone Bias Voltage Requirements

The boom microphone operates on a voltage of 8-16 VDC. Output impedance 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.

The cellular telephone/auxiliary audio interface of the Stratus 50 Digital 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.)

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