PS Engineering
PAC24 Series Audio Selector Panel and Intercom System
Installation and Operator’s Manual
200-240-0010
Page 2-13
Rev. 29, Sept. 2021
2.4.14.1 Standard PAC24 Versions, -0100 (J3, Pins 22, 23 and a)
Interface to the IntelliPAX (111606) expansion unit is through, pins 22 (audio input from expansion unit),
23 (audio output to expansion unit) and a (9 VDC expansion power).
These pins are shared with the microphone inputs; therefore the internal DIP switched must be correctly
configured (see above).
2.4.14.2 Intercom expansion
Observer
Versions, -0400, (J3, Pins
b
, 24 and
a
)
Interface to the IntelliPAX (11606) expansion unit is through, pins 24 (audio input from expansion unit), b
(audio output to expansion unit) and
a
(9 VDC expansion power).
These pins are shared with other inputs; therefore, the internal DIP switched must be correctly configured
(see above).
2.4.15 CVR Output
As shipped from the factory, the PAC 24 has a CVR output on Pin 2, J3.
2.5
Adjustments
The PAC24 is factory adjusted to accommodate the typical requirements for most aircraft configurations.
There are two adjustments however, that will allow the installer to tailor the speaker volume controls to suit
specific functions. The PA volume adjusts the level of pilot and copilot mic audio in Public Address mode.
The Master Volume adjusts the level of
all
audio presented to the cockpit speaker.
Figure 2-6- PAC24 Adjustments
2.6
Communications Antenna Installation Notes
For best results while in Dual installations or Split Mode (two communicates transceivers active at the same time), we
recommend that the one VHF communications antenna is located on top of the aircraft while the other communications
antenna is installed on the bottom. Any antenna relocation must be accomplished in accordance with AC 43.13-2A,
aircraft manufacturers’ recommendations and FAA-approved technical data.
Warning
:
It is probable that radio interference will occur in the split mode when the frequencies of the two aircraft radios are
adjacent, and/or the antennas are physically close together. PS Engineering makes no expressed or implied war-
ranties regarding the suitability of the PAC24 in Dual or Split Mode.
PA Volume
Master Volume