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PS Engineering

PAC24 Series Audio Selector Panel and Intercom System

Installation and Operator’s Manual

200-240-0010 Page 2-11 Rev. 25, Feb. 2015

2.4.12.1 Push to talk intercom

The PAC24 can be used as an IntelliVox® intercom, or, as a keyed intercom. Switching J3 pin W to

ground will inhibit the IntelliVox® and the intercom squelch will not open until the ICS PTT switch is ac-

tivated.

The following pins are used to control the intercom when PTT ICS is desired. Pin 11 must be grounded

through a momentary switch for the pilot to talk on the intercom (with W also grounded). Pin M must be

grounded through a momentary switch for the copilot to talk on the intercom (with W also grounded).

2.4.13 Entertainment Input (J3 Pin 7)

If music or entertainment is desired, a monaural input can be applied to Pin 7 of J3.

NOTE: Use the low level output of any entertainment device to connect to the audio

panel. Maximum signal level is 2 VAC p-p.

DO NOT use a speaker-level output, this will cause internal damage in the audio pa n-

el.

All entertainment devices must be switched off for both takeoff and landing.

2.4.13.1 Entertainment distribution

The entertainment source provides music for all intercom positions. In ISO, it is removed from the pilot.

The PAC24-system incorporates a "Soft Mute" system. This will mute the entertainment devices during

ICS or radio conversation.

Any signal appearing in the unswitched audio inputs will always mute the entertainment sources, even

though the passengers may not hear the audio tone itself.

Caution: Local oscillators and internal signals from some entertainment equipment can cause undesired

interference with other aircraft systems. Before takeoff, operate the entertainment devices to determine if

there is any adverse effect within the aircraft systems. If any unusual operation is noted in flight, immedi-

ately switch off the entertainment devices.

All entertainment devices must be switched off for both takeoff and landing.

2.4.13.2 Entertainment inhibit

The music input to the PAC24 uses the existing Speaker Power input from the KMA24-71. This pin should

be removed even if music is not desired. However, if avionics power remains on Pin 7, there is the possibil-

ity of power ripple entering the system. The Music input can be deactivated from the front panel by press-

ing the NAV 1 and AUX (ADF in –0500) buttons for at least 3 seconds. The audio panel will then ignore

any signal on this input, until the Music Off mode is toggled again.

2.4.14 Intercom expansion

The PAC24 contains a five-place intercom (pilot, copilot and three passengers). The passengers are on the

same audio output as the copilot. If a true “crew” mode is desired, or in applications where more intercom

positions are needed, PS Engineering can provide intercom expansion units, such as the IntelliPAX, part

number 11606 or 11606R. These can add up to six additional stereo intercom stations, plus independent

stereo music input. Note: Observer versions (-0400 or -0401) are wired differently that others. Please use

correct wiring diagram to avoid damaging the unit.

NOTE: When a panel mounted IntelliPax (11606) expansion unit is used, both the PAC24 and the panel

mounted expansion volume controls are both active. We recommend turning the expansion unit volume

control completely CCW (lowest) and then using the PAC24 volume control to adjust the passengers’ vol-

ume.

NOTE: In installations where an expansion unit is NOT used, the passenger and copilot audio output is

paralleled (J1, pin b). Therefore, unswitched audio will be heard by the passenger(s). Use an expansion

unit, P/N 11616, or 11616R (remote) to isolate passenger audio from unswitched alert audio.

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