PS Engineering PAC45L Manuel utilisateur

202-045-3000 Page 1PAC45L Pilot Guide

9800 Martel Road

Lenoir City, TN 37772

www.ps-engineering.com

PAC45L System

With MultiTalker®

Flying Never Sounded So Good!®

Pilot’s Guide

and

Operation Manual

FOR DUAL CONTROL HEAD SYSTEMS

202-045-3200 April 2021

FAA TSO C139a

PS Engineering, Inc. 2021 ©

Copyrighted information in this manual is subject to change without notice. PS Engineering reserves the right to

improve or change the products or contents of this manual, without notification of any person or agency. The

contents of this pilot’s guide may be downloaded, stored and reprinted for personal use provided that this copyright

information is included. Commercial use is strictly prohibited. For further information contact the Publications

Manager at PS Engineering, Inc., 9800 Martel Road, Lenoir City, TN 37772. Phone (865) 988-9800

Page 2 202-045-3000 April 2021 PAC45L Pilot Guide

This pilot guide provides detailed operating instructions for the PS Engineer-

ing PAC45L, Audio Selector Panel/Intercom Systems. Please read it careful-

ly before using the equipment so that you can take full advantage of its capa-

bilities. 



PAC45L Pilot Operating Controls

PAC45L Copilot Operating Controls

202-045-3000 Page 3PAC45L Pilot Guide

Power and Fail Safe

Unit power is controlled by the transmitter

(XMT) selector knob. In the "EMG" or off

(fully clockwise) position, the pilot headset is

connected directly to COM 1 as well as alerts

and unswitched input #1. This allows commu-

nication capability regardless of unit condition.

NAV1 audio is also provided to the pilot in the

other ear of a stereo headset.

In Fail Safe (EMG) on the Copilot panel, that position will hear COM 2. The

copilot can place the control panel in EMG without affecting pilot operation.

Any time power is removed or turned off, the audio selectors will revert to fail

-safe mode. If fail-safe audio is present in both ears of a stereo headset, or

completely absent, verify that a stereo headset is used and is selected for ste-

reo mode.

The power controls all audio selector panel functions and intercom.

Communications Transmit (XMT) Selection

The PAC45L has a rotary control knob to select communications transceiver

functions. To select a transceiver for transmit; turn the knob to select the de-

sired radio.

The radio is automatically selected to receive in-

coming radio calls when the XMT is selected.

With a PAC45L, you will never transmit on a

radio that you are not receiving. The selected au-

dio is indicated by both knob position and the

green text. The pilot and copilot controllers can

select any of the installed transceivers. In the case

where both have selected the same radio for trans-

mission, the pilot will have priority when he uses the radio push to talk.

OXY Selector

The OXY button Activates the Oxygen Mask microphone inputs

if configured.

COM Audio Selector

The communications receiver

audio sources are controlled by

a combination pull on-push-off

switch/volume control. Com-

munication audio from another

radio, not selected for transmit,

can be heard by pulling out the

Page 4 202-045-3000 April 2021 PAC45L Pilot Guide

associated RCV switch. The selected audio is indicated by both knob posi-

tion and the green nomenclature text.

You will always hear the audio from the selected transceiver, even if the

selected comm audio is turned all the way down on the audio controller

because it cannot turn the selected receive audio all the way off.

The volume of the received source is adjusted by rotating the knob. PS En-

gineering recommends a lower volume at the radio and higher audio panel

setting to minimize noise.

Receiver Activity Indication (-RXI)

PAC45L systems have a Receive Activity Indicator that flashes the selected

receiver indicator when a signal is present on that receiver. This allows the

user to spot an active radio, even if the volume is turned down. This func-

tion is set at the factory at the installer’s request, and can be

changed at the factory.

MultiTalker® Head Related Transfer Function

(HRTF)

Communication receiver audio signals are presented to the

DSP and processed to “appear” in a different location to the

crew. “MultiTalker” (US Patent #7,391,877) specifies up to

nine locations. This helps the crew to better comprehend

speech by locating it in a manner more easily differentiated

by the human brain.

Intercom and other audio is not spatially processed, only the three commu-

nications transceivers.

You must use stereo headsets, in stereo mode for this feature.

MultiTalker® places the communications receiver audio in one of nine ap-

parent locations in the crew’s headset. This has been scientifically shown to

allow the brain to focus on multiple conversations and improve comprehen-

sion for the listener.

Pressing the concentric volume knob (Push HRTF) toggles the PAC45L

MultiTalker spatial function on

(receiver sources distributed) or off

(receiver audio sources neutral). The

HRTF button on the pilot and copilot

panels control the function for the user

of that panel.

Audio Location

This adjustment allows the three Spatial

Audio inputs to be “relocated” on any

of nine (9) pre-defined “Head Related

Transfer Function” (HTRF) locations.

202-045-3000 Page 5PAC45L Pilot Guide

The pilot panel can control the locations for the six receive audio locations

for all users. Press and hold the OXY button for >3 seconds on the pilot’s

panel until the HRTF button and all COM nomenclature start blinking

green.

Rotate the desired COM receive volume knob so the pointer indicates the

approximate location of the desired location. A voice announcement will

accompany the knob rotation with the clock positions. Received audio will

then be presented from that location.

Press the OXY (or HRTF) button again to exit the

mode. The audio Controller will remember last state

through power cycles.

Navaid Audio Selection

Navigation receivers are selected in the same manner

as the communication receiver, pull on/push off the knob associated with

the desired navigational aid, and rotate to adjust the receiver volume.

Speaker operation

To activate the cockpit speaker, pull the SPR knob out and adjust the vol-

ume as desired. This will place all received audio over the cockpit speaker.

Both pilot & copilot have their own separate cockpit speaker selection.

Satellite/Telephone control

The volume control selector connects the audio controller to

either a Bluetooth®-enabled cell phone or a wired cellular/

satellite phone.

Pull out the volume control to select (answer or make phone

call) and adjust the receive audio volume. This knob must be out

to use the telephone function.

To hear the ringer of the Bluetooth phone, the volume control should be

around the 12 o’clock position. Selecting the SAT switch in the OUT posi-

tion is not required.

Intercom Operation

IntelliVox® Intercom VOX-Squelch

No adjustment of the IntelliVox® squelch control is nec-

essary. Through three individual signal processors, the

ambient noise appearing in all six microphones is con-

stantly being sampled. Non-voice signals are blocked.

When someone speaks, only their microphone circuit

opens, placing their voice on the intercom.

Page 6 202-045-3000 April 2021 PAC45L Pilot Guide

The system is designed to block continuous tones; therefore people hum-

ming or whistling in monotone may be blocked after a few moments.

For consistent performance, any headset microphone must be placed within

¼-inch of your lips, preferably against them. (ref: RTCA/DO-214A,

§1.3.1.1 (a)).

NOTE

It is also a good idea to keep the microphone out of a direct wind path.

Moving your head through a vent air stream may cause the IntelliVox® to

open momentarily. This is normal.

The IntelliVox® is designed to work with normal aircraft cabin noise levels

(70 dB and above). It loves aircraft noise! Therefore, it may not recognize

speech and clip syllables in a quiet cabin, such as in the hangar, or without

the engine running. This is normal.

For optimum microphone performance, PS Engineering recommends instal-

lation of a Microphone Muff Kit from Oregon Aero (1-800-888-6910). This

will not only optimize VOX performance, but will improve the overall clar-

ity of all your communications.

Intercom Volume Control

The intercom volume control knob adjusts the loudness of the intercom for

the intercom stations(s) connected to the audio controller panel. It has no

effect on selected radio levels, or music input levels.

In 2-control panel installation, the pilot panel controls pilot intercom vol-

ume only, copilot panel controls copilot and passenger intercom volume.

Monaural headsets

The pilot and copilot positions work with stereo or mono headsets. Howev-

er, MultiTalker will not be presented correctly unless stereo headsets are

used, and oriented correctly on the head, left and right.

NOTE: For the full effect of MultiTalker® Dimensional Sound, stereo

headsets must be used, and the left/right orientation observed.

All passenger headsets are connected in parallel. Therefore, if a monaural

headset is plugged in to a PAC45L Stereo installation, one channel will be

shorted. Although no damage to the unit will occur, all passengers with

stereo headsets will not hear one channel, unless

they switch to the “MONO” mode on their headset.

NOTE: Mono headsets that short the tip and ring

(i.e. older models) will introduce some audio dis-

tortion when used. Modern, stereo headsets are

recommended in all positions.

202-045-3000 Page 7PAC45L Pilot Guide

Intercom Modes

The “ICS” pushbutton switch on the panel provides the selection of the

intercom modes

The intercom mode defaults to “CRW” at power up. Then the button cycles

through the intercom modes, from bottom to top, then top to bottom: PAX

CRW ISO, CRW. A green indicator shows which mode is currently active.

 Each control head has their own ISOLATE selection. The control head

is isolated from the intercom stations and is connected only to the aircraft

radio’s that are selected system. They will hear the aircraft radio reception

(and sidetone during radio transmissions).

: Pilot and copilot are connected on one intercom channel and have

exclusive access to the aircraft radios. The pilot or copilot control head will

decide when the system will be in the ALL mode by pressing their ICS

switch. The observers can communicate with each other and passengers in

ALL or OBS mode or select ISO mode.

: Pilot and copilot have the option to add passengers to their intercom

channel by holding down the ICS button for 4 seconds. This will then all

passengers to speak with that crew station. Cycling power will place system

back into the Crew mode and no passengers.

Remote ICS Mode Control

An optional external switch can act as a remote intercom mode selector.

Pressing the switch will increment the intercom mode selector from ISO--

CRW-ISO-PAX, etc. each time the button is pressed.

Bluetooth® connection

The PAC45L has an internal Bluetooth module, no external boxes required.

The audio controller is always “discoverable,” so you just need to search

for the PAC45L from your Bluetooth-equipped phone or music source.

Default access code is not required. Once the PAC45L has been “paired”

with your Bluetooth device, the TEL distribution will act as described be-

low.

Pairing Bluetooth® devices

The PAC45L can be paired with up to eight individual devices, but will

only connect to one at a time. When that number is exceeded, the PAC45L

will drop a device to allow the new device to be added.

If the audio controller is turned on before the Bluetooth device, you will

have to manually connect from your Bluetooth device. Otherwise once

paired, the audio controller should connect automatically.

Page 8 202-045-3000 April 2021 PAC45L Pilot Guide

Hint, if your devices are not recognized by the PAC45L, you may need to

reset the Bluetooth module, Press and hold VOC and ICS buttons for more

than three (>3) seconds.

Bluetooth® Telephone Mode

The PAC45L serves as a full duplex interface for telephone

systems such as portable cellular phones with Bluetooth con-

nectivity.

Warning: United States FCC Regulations contained in 47

CFR § 22.925 currently contain prohibition on airborne oper-

ation of cellular telephones. “Cellular telephones installed in

or carried aboard airplanes, balloons or any other type of

aircraft must not be operated while such aircraft are airborne (not touching

the ground). When any aircraft leaves the ground, all cellular telephones

on board that aircraft must be turned off.”

To answer an incoming call, or initiate a call from the PAC45L, select the

TEL volume control to the .

In CREW mode, the pilot and copilot are connected to the telephone. The

pilot and copilot will have transmit capability on the selected transceiver,

simply by using their respective PTT switch.

In PAX intercom mode, all crew and passengers will be heard on the phone

when they speak. All will hear selected audio. Com audio is automatically

heard in the headsets.

In ISO intercom mode, when the PAC45L is in the TEL

mode, the pilot position is in the "Phone Booth." Only the

pilot will hear the telephone, and only he will be heard. He

will also have access to Com 1 or 2, and will transmit on that radio

using the PTT. All selected audio is provided.

NOTE

PS Engineering does not guarantee compatibility with per-

sonal cellular telephones.

Bluetooth Reset

If the Bluetooth stops connecting to a device, or operates incorrectly first

try turning Bluetooth off, and back on from your device. If also me be nec-

essary to reset the Bluetooth module, clearing out the connected devices.

Press HRTF and ICS for more than three seconds. This may be necessary if

the Bluetooth stops connecting to a device, or operated incorrectly.

202-045-3000 Page 9PAC45L Pilot Guide

Music Muting Control

The PAC45L incorporates PS Engineering’s trademark “SoftMute. The

SoftMute™ circuit will mute the music whenever there is conversation on

the radio or the intercom. When that conversation stops, the music returns

to the previous level comfortably, over a second or so.

Holding down VOC button for three (3) seconds will turn the music muting

on/off.

When in mute off mode, the intercom, radio &

PTT will not mute the music. The music muting

will reset to mute on mode at each power cycle.

Any control head will switch the muting on or off

for all users.

Wired Satcom/Cell Phone input

The PAC45L can accommodate a wired telephone input as well as a Blue-

tooth connection. This operates the same as the Bluetooth Telephone .

Navaid Identifier

The PAC45L is equipped with an identifier filter that will enhance the 1030

Hz Morse Code identifier (ID Mode), or reduce the Morse Code identifier

for clearer reception of voice transmissions or VOR (VOC).

The ident filter is added to Nav 1, NAV 2 and ADF inputs.

Alert Audio

The PAC45L incorporates an independent alert audio system that can store

nine audio messages recorded by the user, and played back when triggered

by an external source.

Once triggered, the alert audio will continue until the ACK button (front

panel or external) is pushed, or the trigger input returns to normal.

The alert inputs are ignored for the first 60 seconds after power is applied,

to reduce nuisance alerts during startup.

Alerts are provided to the pilot in fail safe, if the audio systems’ alert power

is connected, and a stereo headset is used.

Storing Alert Audio

The PAC45L system can store nine audio alerts. You must record all nine

when the unit is in audio program mode. You cannot change only one at a

time. If you wish to replace just one message, we recommend you write

Page 10 202-045-3000 April 2021 PAC45L Pilot Guide

down all the messages before starting the procedure. To record and use te

Alert function, a remote Acknowledge (ACK) button must be installed.

To record messages from the pilot’s headset:

1. Custom messages may be stored by the user. All Alerts shall be record-

ed when the unit is in program mode. To record messages from the

Pilot’s station:

2. Press & Hold remote ACK until a chime is heard in the headset, and

then release the button.

3. COM1 RCV shall blink, to indicate the recording of Alert 1.

4. Start speaking message.

5. When finished with Alert 1, press the remote ACK.

6. Now COM2 RCV shall blink, to indicate the recording of Alert 2.

7. Speak message.

8. When finished with Alert 2, press the remote ACK

9. Repeat this procedure until all alerts are recorded (indications for re-

cording Alerts 1-9 shall be COM1-8 and AUX1 RCV respectively).

10. A chime indicates recording is now finished.

11. If ACK is not pressed to indicate end of recording, it shall record for

five seconds, and then advance to next alert. After all slots are timed

out, the system shall exit the alert recording mode.

Stereo Helmet Conversion

For optimum performance, and for any effective Head Related Transfer

Function, stereo headphones must be used.

Several companies modify flight helmets to add stereo capability, and

change the microphone to high impedance civil aviation if it is military, or

low impedance.

Companies Include:



Phone: 574-293-0534

www.acousticom.com



Phone: (800) 531-4898

www.FlightHelmet.com



Phone: 800-876-3374

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