Telex Stratus 50 - Manual (Page 4)

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.)
Page 2