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.
Do not connect !