AA80 InterVOX Intercom Systems
SM08 Installation and Operation Manual
April 30, 2012 Rev: 5.00 Page 2-12
ENG-FORM: 805-0100.DOTX
CONFIDENTIAL AND PROPRIETARY TO ANODYNE ELECTRONICS MANUFACTURING CORP.
2.5 Installation Notes
1. The -001 and -020 versions are plug compatible only if no connections have been made to pins 12, 13,
and 25. These units should not normally be interchanged in a given aircraft, or ICS and music problems
will occur.
2. The -001 and -060 versions support only VOX or Live ICS, and no provision is made for connecting
multiple units together. The -020 and -062 versions have an ICS Tie Line
for multiple unit connections,
and also provides an ICS key line input to support PTT ICS operations.
ICS Tie Line Connections:
First Unit Second Unit
(AA80-020) (AA80-020)
This will result in common ICS audio between both units. The bus may be ‘split‘ into two loops, or ‘tied‘
together if this line is opened and closed with an external switch. Use shielded cable as shown. This is
applicable to -020 and -062 units only.
PTT ICS Key Connections:
First Unit Second Unit
(AA80-020) (AA80-020)
The IC PTT lines must be tied together between both units, or keying one unit will fail to open the ICS
gate in the second unit. Note that for best PTT operation, the VOX squelch pot on the front panel should
be rotated to its most clock-wise position (fully squelched off). Ground switches to the same airframe
return used for the AA80. This is applicable to -020 and -062 units only.
3. The ICS tie line on the -020/-062 can be connected to either another AA80 or to an AEM audio
controller with ICS tie capability. This allows several possibilities for ICS expansion, depending on
customer requirements. Note that the absolute ICS level will drop slightly when a connection is made to
the ICS tie line.
4. The ICS key input must go directily to ground (the same ground point used by the AA80), with no
external diodes or other voltage drops, to ensure correct keying operation. To use the keying function,
rotate the SQUELCH control fully clock-wise (so that no ICS audio is heard). Closing the ICS key line will
then open the squelch, and allow ICS audio to be heard. If the ICS PTT Key lines are not connected
together between units, activating the PTT line will only open the ICS gate in the unit to which it is
connected, and there will be no common ICS audio between units.
5. When using two AA80 units tied together, each AA80 unit will have independant squelch and level
adjustments. Note, however, that the incoming ICS audio from another AA80 must be of sufficient level to
trip the squelch setting on the other unit in use. Some mutual adjustment of squelch controls will be
needed to ensure smooth operation under all conditions.
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