AA95-766 Single Channel Audio Controller
SM95-766 Installation and Operation Manual
June 20, 2012 Rev: 3.00 Page 2-5
ENG-FORM: 805-0100.DOTX
CONFIDENTIAL AND PROPRIETARY TO ANODYNE ELECTRONICS MANUFACTURING CORP.
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.
2.3.7.2 Cautions
Although in-line PTT cordsets can be used conveniently to 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 AA95-766 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 very real 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.
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