AA9x Series Single Channel Audio Controller
SM56 Installation and Operation Manual
May 22, 2012 Rev: 2.00 Page 2-3
ENG-FORM: 805-0100.DOTX
CONFIDENTIAL AND PROPRIETARY TO ANODYNE ELECTRONICS MANUFACTURING CORP.
terminated to the MIC LO connection at the airframe connector of the PTT cordset. See Figure 1 below
for details.
Figure 1: PTT Cord for Use with AEM Audio Controllers (XMIT and ICS)
To avoid complications in the aircraft, it is recommended that the same type of PTT cordsets be 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.
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.
Many in-line PTT cordsets use the PHONE LO connection as the ground reference for the ICS and TX
PTT keylines. The PHONE LO connection in the AA9x series is floating, which will lead to incorrect keying
of the intercom and radio systems if this type of cordset is used.
In-line PTT cordsets can be a source for crosstalk if the MIC wire pair in the cordset is not shielded. The
source of the crosstalk is the high level Phones audio being coupled on to the MIC HI/LO pair in the
in-line PTT cordset, because of the lack of shielding for this wire pair. Once the mic line is contaminated,
the undesired audio can be sent into the audio system as ‘mic audio’, then processed and distributed to
all other audio controllers via the ICS Tie Line.
To Next Page
Loading...
Need help?
General
