Northern Airborne Technology AMS43 - Manual (Page 13)

AMS43 Single Channel Audio Controller
SM59 Installation and Operation Manual
Section 2 Rev: 1.00 Issue 4 Page 2-6
ENG-FORM: 805-0116.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
2.5.3.2 Cautions
CAUTION:
Although in-line PTT drop cords 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 drop cords use the PHONE LO connection as the
ground reference for the ICS and TX PTT keylines. The PHONE LO
connection in the AMS43 is floating, which will lead to incorrect keying of
the intercom and radio systems if this type of drop cord is used.
In-line PTT drop cords can be a very real source for crosstalk if the MIC
wire pair in the drop cord 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 drop cord, 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.
2.6 Accessories Required But Not Supplied
Installation kit AA90-IKC (Alt. part No. D50S37SL-IKC) is required to complete the installation. The
kit consists of one 50-Pin D-min Female Crimp Kit (D50SL-IKC) and one 37-Pin D-min Female Crimp
Kit (D37SL-IKC).
D50SL-IKC consists of
Quantity Description NAT Part #
1 D-min 50 Socket Housing 20-21-050
50 MS Crimp Socket 20-26-901
1* Jack Screw Set 20-27-002
1* Lock Clip Set 20-27-004
1 50 Pin Connector Hood 20-29-051
D37SL-IKC consists of
Quantity Description NAT Part #
1 D-min 37 Socket Housing 20-21-037
37 MS Crimp Socket 20-26-901
1* Jack Screw Set 20-27-002
1* Lock Clip Set 20-27-004
1 37 Pin Connector Hood 20-29-038
* Use as required.