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1. Connecting the headset to the on-board system
The NoiseGard™ electronics can be connected to on-board power supply systems with
operating voltages between 12–35 V DC.
Danger of short circuit!
Before turning on NoiseGard™, ensure that the on-board power supply system is
protected by a 1 A fuse.
The HMEC 350, HMEC 355-C, HMEC 372, HMEC 450 and HMDC 372 headsets are supplied
with an XLR-3 socket for panel mounting in the aircraft. The XLR-3 socket must be
mounted by a technician qualified to perform this type of installation.
HMEC 350 and HMEC 450 headsets:
̈ Connect the ¼” (6.35 mm) stereo jack plug for the headphones and the PJ-068 jack
plug for the microphone to the corresponding jack sockets of your intercom.
̈ Connect the XLR-3 plug to the XLR-3 socket.
Power supply for
NoiseGard™
Ground
Do not connect !
XLR-3 socket