Northern Airborne Technology AMS43 - Manual (Page 11)

AMS43 Single Channel Audio Controller
SM59 Installation and Operation Manual
Section 2 Rev: 1.00 Issue 4 Page 2-4
2.5.1 Left Side panel adjustments
The trimpots on the left side panel are used to adjust the levels of audio in the user’s headphones. Rotating the
trimpots clockwise (cw) increases the level, and counterclockwise (ccw) reduces it.
The ALERT LEVEL trimpot is used to adjust the levels for the three internally generated Alert signals.
Other parameters relating to these signals are adjusted from the right side panel (see section 2.3.4.2.)
The S/T LEVEL trimpot adjusts the internal gain of the sidetone (S/T) of the selected transceiver (from the
front panel) in the user’s headphones.
The VOX LEVEL trimpot sets the sensitivity level for the front panel VOX control (the level of audio
required to activate microphones).
The POWER ON LED will illuminate to indicate that the unit is connected to the power supply.
2.5.2 Right Side Panel Adjustments
A variety of different signals can be selected to trigger the internal Alert signals. The trimpots on the right
side panel are used to adjust the characteristics of the audible signals that the user will hear.
Audio Alert 1 is a single tone signal and Audio Alerts 2 and 3 are two-tone signals. The pitch of the
signals can be adjusted using the relevant TONE trimpot, and the cycling rate of the two-tone signals can
be adjusted using the RATE trimpots. The duration of Audio Alert 3 can be adjusted from one to three
seconds using the TIME trimpot.
The DIR AUD LEVEL trimpot is used to adjust the audio level of the devices connected to the DIR AUD 1 input.
2.5.3 In-line PTT Drop Cords
2.5.3.1 General
In-line, push-to-talk (PTT) drop cords (also known as cordsets) can be used to create/provide PTT capability
for the user headsets that do not have yoke or cyclic mounted PTT switches. For headsets connected to
the PILOT or COPILOT inputs/outputs of the AMS43, ICS and TX keylines are needed to properly activate
the associated PTT circuitry inside the AMS43. For headsets connected to the PASSENGER inputs/outputs
of the AMS43, a method of controlling the microphone on the headset is needed because of the 'hot mic'
circuitry. This is best accomplished with a 'mic interrupt' switch in the PTT drop cord.
ENG-FORM: 805-0116.DOT
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