Telex ANRTM 150 - Manual (Page 3)

Page 1
General Description
The Echelon ANR 150 is a medium-weight aircraft communications
headset. It features electronic noise reduction circuitry for improved
reduction of aircraft motor and wind noise. The Echelon ANR 150 also
features extended response receivers for improved sound reproduction
from the aircraft radio and entertainment system.
The Echelon ANR 150 noise reduction system may be powered from
either a battery module or an aircraft power module. The battery module
is designed for portable applications and uses one 9 volt battery.
Operating time with alkaline batteries is 40 hours minimum. The aircraft
power module is designed for permanent installation and provides power
to the headset from the aircraft electrical system. The aircraft power
module works with negative ground electrical systems.
The Echelon ANR 150 headset features a stereo headphone plug and a
stereo/mono select switch. The Echelon ANR 150 can be plugged directly
into an aircraft radio for standard monaural communications or into an
intercom system wired for stereo entertainment.
FAA TSO C57a and C58a approved.
Design Features (See Figure 1)
Fit and Comfort
A unique headband design distributes ear cushion pressure evenly over
the entire ear with no pressure points, unlike conventional designs which
apply more pressure on the bottom of the ear than on the top. An added
advantage of this design is that the headset folds into an extremely
compact shape for storage. A clamp adjustment on each knuckle adjusts
to provide greater noise reduction or greater comfort. The earcups pivot
on two planes to conform to any wearer. Detented sliders adjust the
headband for best fit on any head size. A large head pad evenly
distributes the headset weight on the head with no pressure points.
Comfortable foam-filled ear cushions are standard.
Boom Microphone
A flexible gooseneck boom permits precise microphone placement. The
boom rotates overhead to use the microphone on either side of the head.
The plug-in microphone cartridge features a noise-canceling electret ele-
ment. The cartridge unsnaps for easy replacement. A built-in microphone
amplifier (electret version) operates on current supplied by the aircraft radio
via the microphone jack.
Cordage and Plugs
The microphone cordage is protected inside the boom arm. Shielded wire
throughout the headset protects against RFI and EMI. Strain-reliefs on all
cords provide maximum durability. A separate plug connects the headset
to either a battery module or an aircraft power module. The headset also
has separate microphone and receiver plugs. The receiver plug is a stereo
type, but a selector switch on the cord permits monaural operation.