EN
3
Trig Digital Noise Reduction
The TMA45 provides an automatic VOX squelch control (TDNR). Each
microphone input is monitored through a digital processor and opens instantly
when human speech is detected. This results in seamless conversations aboard
the airplane for crew and passengers, without syllable clipping or fatigue-
inducing noise.
No manual control or field adjustment is required.
The system is designed to block continuous tones, therefore people humming
or whistling in monotone may be blocked after a few moments.
For consistent performance, any headset microphone must be placed within
¼-inch of the lips, preferably against them. It is important to have the
microphone element parallel to the mouth, and not twisted inside the cover.
You should also keep the microphone out of a direct wind; moving your head
through an air stream may cause the TDNR to open momentarily.
The TDNR is designed to work with normal aircraft cabin noise levels (70 dB
and above), therefore it may not always recognize speech and clip syllables in
a quiet area, such as in the hangar, or when the engine is not running.
Intercom Modes
The Intercom (I/C) button is a 3-function mode selector that allows the pilot
to tailor the intercom function to best meet the situation; it cycles through the
following intercom modes, from top to bottom.
PILOT: The pilot is isolated from the intercom and is connected only
to the aircraft radios. Co-pilot and passengers will hear the intercom
and Music 1, but not the aircraft radio receptions or pilot
transmissions.
ALL: All parties will hear the aircraft radios, intercom and Music 1.
CREW: Pilot and co-pilot are connected on one intercom channel
and have exclusive access to the aircraft radios. They may also listen
to Music 1. Passengers can continue to communicate amongst
themselves without interrupting the crew and may listen to Music 2.
When in Split mode, the ALL intercom mode is not available and pressing the
Intercom button will cycle between PILOT and CREW modes.
