Northern Airborne Technology AMS43, Инструкция по установке и эксплуатации

Страница: 21 / 42

SM59 Rev. 4.00 AMS43 Single Channel Audio Controller Manual
There are numerous manufacturers of in-line PTT cordsets, offering many 'electrical'
variations to accomplish different functions. To meet the operational requirements for
headset stations supported by the AMS43, NAT recommend the dual switch type: a 3-
position (momentary/center-off/locking) slider switch for the ICS functions, and a
momentary, push-button switch for the TX functions. Both switches provide a ‘mic
interrupt’ function. The 3-position ICS switch will allow the user to change the switch
settings to match the operational intercom mode that has been selected at the AMS43
(e.g., LIVE, KEYED or VOX). The cable should have 6 conductors, with the MIC and
PHONE pairs shielded (MIC wires must be shielded as a minimum). To ensure proper
shielding, the shield(s) should be terminated to the MIC LO connection at the airframe
connector of the PTT cordset. See the drawing below for details.
To avoid complications in the aircraft, it is recommended that the same type of PTT
cordsets are used for all headset locations in the aircraft. It is not good practice to
create a situation where a specific cordset is needed for the copilot, which might cause
operational errors if moved to a passenger location.
2.3.6.2 Cautions
Although in-line PTT cordsets can be used to conveniently address a number of
requirements for microphone and PTT control, they can also be a source of trouble if
incorrectly configured, or improperly shielded.
Nov 10, 2003 Page 2-5
ENG-FORM: 805-0106.DOT
Amendment #1 Feb 15, 2005
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.