PS Engineering PAC45 System With MultiTalker User manual

202-045-0300 Page 1Revision 2 PAC45 Pilot Guide
9800 Martel Road
Lenoir City, TN 37772
www.ps-engineering.com
PAC45 System
With MultiTalker®
Flying Never Sounded So Good! ®
Pilot’s Guide
and
Operation Manual
FOR THREE CONTROL HEAD SYSTEMS
202-045-0300 Revision 2 JULY 2019
Serial Number GH01139 and above
FAA TSO C139a
PS Engineering, Inc. 2018 ©
Copyright Notice
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 [phone]

Page 2 202-045-0300 July 2019 PAC45 Pilot Guide
This pilot guide provides detailed operating instructions for the PS Engineer-
ing PAC45, Audio Selector Panel/Intercom Systems. Please read it carefully
before using the equipment so that you can take full advantage of its capabil-
ities. NOTE: Because of user customization of the labels, appearance
may differ from illustrations
PAC45 Pilot Operating Controls
PAC45 Copilot Operating Controls

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Power and Fail Safe
Unit power is controlled by the transmit-
ter (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 communication capability
regardless of unit condition. NAV1 au-
dio 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 stereo mode.
The power controls all audio selector panel
functions, and intercom.
The Observer Audio Panel has an OFF posi-
tion. This removes observer and passenger audio as well as transmit or receive
from radios. There is no ail-safe audio in the observer audio panel.

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Communications Transmit (XMT) Selection
The PAC45 has a rotary control knob to select
communications transceiver functions. To se-
lect a transceiver for transmit; turn the knob to
select the desired radio.
The radio is automatically selected to receive
incoming radio calls when the XMT is selected.
With a PAC45, you will never transmit on a
radio that you are not receiving. The selected
audio is indicated by both knob position and the
green text. The pilot copilot and observer controllers can select any of the
installed transceivers. In the case where both have selected the same radio
for transmission, the pilot will have priority when he uses the radio push to
talk.
COM Audio Selector
The communications receiver audio sources are controlled by a combina-
tion push on-push-off switch/volume control. Communication audio from
another radio, not selected
for transmit, can be heard
by pressing the associated
RCV switch, which will
place it in the OUT posi-
tion. The selected audio is indicated by both knob position and the green
nomenclature text.
You will always hear the audio from the selected transceiver, even if the
selected com audio is turned all the way down on the audio controller be-
cause it cannot turn the selected receive audio all the way off.
The volume of the received source is adjusted by rotating the knob. The
volume is adjusted for the pilot, copilot, and observer/passengers on their
respective panels. PS Engineering recommends a lower volume at the radio
and higher audio panel setting to minimize noise.
Receiver Activity Indication (-RXI)
PAC45 systems (HUB45 Serial Number DH1069 and above) have a Re-
ceive Activity Indicator that flashes the selected receiver indicator when a
signal is present on that receiver. This allows the user to spot an active ra-
dio, even if the volume is turned down. This function is set at the factory at
the installer’s request, and can be changed at the factory.
MultiTalker® Head Related Transfer Func-
tion (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) speci-

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fies 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 six communi-
cations 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 HRTF button toggles the PAC45 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
six Spatial Audio inputs to
be “relocated” on any of
nine (9) pre-defined “Head
Related Transfer Func-
tion” (HTRF) locations.
The pilot panel can control
the locations for the six re-
ceive audio locations for all
users. Press and hold the
HRTF button for > 1 second
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 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, push on/push off the
knob associated with the desired navigational aid, and
rotate to adjust the receiver volume.

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Telephone control
The volume control selector connects the audio controller to
either a Bluetooth®-enabled cell phone or a wired cellular/
satellite phone.
Push to pop 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 TEL switch in the OUT posi-
tion is not required.
Intercom Operation
IntelliVOX® Intercom VOX-Squelch
No adjustment of the IntelliVOX® squelch control is
necessary. 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.
The system is designed to block continuous tones; there-
fore people humming 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 lev-
els (70 dB and above). It loves aircraft noise! Therefore, it may not recog-
nize 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.
Push to talk intercom (PTT ICS)
Pressing the intercom volume knob (ICS VOL) will place the system into
the Push-to-talk (PTT for Intercom use) mode. This will disable the voice

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activation (VOX) and require that the external push to talk intercom buttons
for each position be used to speak on the intercom.
Push the knob again and the systems toggles back to voice activation. The
mode is shown by the green indication in the text.
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 copilot and observer positions work with stereo or mono headsets.
However, 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 PAC45 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 distortion when used. Modern, stereo headsets are
recommended in all positions.
Intercom Modes
The “ICS” pushbutton switch on the panel pro-
vides the selection of the intercom modes
The intercom mode defaults to “ALL” at power
up. Then the button cycles through the intercom modes, from top to bottom,
then bottom to top as: ISO, ALL CRW and CRW, ALL, ISO. A green indi-
cator shows which mode is currently active.
ISO: The pilot or copilot that has selected ISO is isolated from the intercom
and is connected only to the aircraft radio system. He will hear the aircraft
radio reception (and sidetone during radio transmissions). The other crew
member (unless they have also selected ISO) and passengers will have radi-
os, intercom and music.
ALL: All parties will hear the aircraft radio, intercom and music. During
any radio or intercom communications, the music volume automatically

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decreases. The music volume increases gradually back to the original level
after communications have been completed.
Crew (CRW): Pilot and copilot are connected on one intercom channel and
have exclusive access to the aircraft radios. The observer and passengers will
be able to talk to each other.
In addition, the following rules apply:
• System defaults to ALL-ALL-ALL at power up.
• Any panel can select ISO, and be removed from the intercom.
• Either pilot or copilot panel can select CRW, and place both panels in
Crew mode, while the observer audio controller is forced to ISO.
• Either pilot or copilot panel can select ALL and add everybody to the in-
tercom.
• The Mission Observer panel can select ISO, and then select ALL, unless a
pilot or copilot has selected ISO or CREW.
With the CTL45M installed, the observer/mission personnel can
isolate their audio feed from the crew by pressing the ICS
button. When the CTL45M is in ISO mode, the observer/
passengers will have intercom among themselves, and be
able to use the selected radios.
If the flight crew selects ISO or Crew modes, the CTL45M
will automatically enter the ISO mode, and will not change
modes unless the crew changes their state. If the observer personnel desire to
communicate with the crew, pressing “CALL” will activate an ICS call light
and a chime in the crew headsets.
Remote ICS Mode Control
An optional external switch can act as a remote intercom mode selector. Press-
ing the switch will increment the intercom mode selector from ISO-ALL-
CRW-ISO-ALL, etc. each time the button is pressed.
Bluetooth® connection
The PAC45 has an internal Bluetooth module, no external boxes required. The
audio controller is always “discoverable,” so you just need to search for the
PAC45 from your Bluetooth-equipped phone or music source. Default access
code is not required. Once the PAC45 has been “paired” with your Bluetooth
device, the TEL distribution will act as described below.
Pairing Bluetooth® devices
The PAC45 can be paired with up to eight individual devices, but will only
connect to one at a time. When that number is exceeded, the PAC45 will drop
a device to allow the new device to be added.

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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.
Hint, if your devices are not recognized by the PAC45, you may need to
reset the Bluetooth module, Press and hold HRTF and ICS buttons for more
than three (>3) seconds.
Bluetooth® Telephone Mode
The PAC45 serves as a full duplex interface for telephone systems such as
portable cellular phones with Bluetooth connectivity.
Warning: United States FCC Regulations contained in 47 CFR § 22.925
currently contain prohibition on airborne operation 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 air-
borne (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 PAC45, select the
TEL volume control to the out position.
In ALL 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 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 ISO intercom mode, when the PAC45 is in the TEL mode, the pilot posi-
tion 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 personal 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 de-
vice. If also me be necessary 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.

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Music Muting Control
The PAC45 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 previ-
ous level comfortably, over a second or so.
Holding down ACK 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 mu-
sic. 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 PAC45 can accommodate a wired telephone input as well as a Blue-
tooth connection. This operates the same as the Bluetooth Telephone .
Alert Audio
The PAC45 incorporates an independent alert audio system that can store
three 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 PAC45 system can store three audio alerts. You must record all three
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
down all the messages before starting the procedure.
To record messages from the pilot’s headset:
1. Press & Hold “ACK” AND “HRTF” until a chime is heard in the head-
set, and then release the button.
2. COM1 will blink, to indicate the recording of ALERT #1.
3. Start speaking message.
4. When finished with Alert #1, press the “ACK”.

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Subject Index Page
Audio Alerts
Storing Alert Audio
9
Audio Location (HRTF) 4
Bluetooth® connection
Bluetooth Reset
Bluetooth® Telephone Mode
Pairing and unpairing Bluetooth devices
Pairing separate music and telephone devices
7
COM Audio Selector 3
Communications Transmit (XMT) Selection 3
IntelliVOX® Intercom VOX-Squelch 4
Intercom Modes 6
Intercom Operation 4
Intercom Volume Control 5
Monaural headsets 6
MultiTalker™ Head Related Transfer Function (HRTF) 3
Navaid Audio Selection 4
Power and Fail Safe 2
Push to talk intercom (PTT ICS) 5
Remote ICS Mode Control 7
Single Unit/Control Head 6
Telephone control 4
Wired Satcom/Cell Phone input 8
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.
These companies Include:
acousticom Phone: [phone] www.acousticom.com
FLIGHTHELMET.COM Phone: [phone] www.FlightHelmet.com
Headsets Inc. Phone: [phone] www.headsetsinc.com

Page 12 202-045-0300 July 2019 PAC45 Pilot Guide
5. Now COM2 will blink, to indicate the recording of ALERT #2.
6. Speak message.
7. When finished with Alert #2, press the “ACK”
8. Now COM3 blinks, to indicate the recording of ALERT #3.
9. Speak message.
10. When finished with Alert #3, press the “ACK”
11. A chime indicates that recording is now finished.
NOTE: If ACK is not pressed to indicate end of recording, it will record for
five seconds, and then advance to next alert. After all three time slots are
timed out, the PAC45 will exit the alert recording mode.
PS Engineering, Inc. 2018 ©
Copyright Notice
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 [phone]
Warranty & Service
In order for the factory warranty to be valid, the installations in a certified aircraft must be accom-
plished by an FAA-(or other ICAO agency) certified avionics shop and authorized PS Engineering
dealer. If the unit is being installed by a non-certified individual in an experimental aircraft, a
factory-made intercom harness must be used for the warranty to be valid.
PS Engineering, Inc. warrants this product to be free from defect in material and workmanship for
a period of two (2) years from the date of retail sale by authorized PS Engineering dealer. During
the first twelve (12) months of the two-year warranty period, PS Engineering, Inc., at its option,
will send a replacement unit at our expense if the unit should be determined to be defective after
consultation with a factory technician. For the remaining twelve (12) months of the two-year
warranty period, PS Engineering will send a no-cost replacement unit at customer shipping ex-
pense.
All transportation charges for returning the defective units are the responsibility of the purchaser.
All domestic transportation charges for returning the exchange or repaired unit to the purchaser
will be borne by PS Engineering, Inc. The risk of loss or damage to the product is borne by the
party making the shipment, unless the purchaser requests a specific method of shipment. In this
case, the purchaser assumes the risk of loss.
This warranty is not transferable. Any implied warranties expire at the expiration date of this war-
ranty. PS Engineering SHALL NOT BE LIABLE FOR INCIDENTAL OR CONSEQUENTIAL
DAMAGES. This warranty does not cover a defect that has resulted from improper handling,
storage or preservation, or unreasonable use or maintenance as determined by us. This warranty is
void if there is any attempt to dissemble this product without factory authorization. This warranty
gives you specific legal rights, and you may also have other rights, which may vary from state to
state. Some states do not allow the exclusion of limitation of incidental or consequential damages,
so the above limitation or exclusions may not apply to you.
All items repaired or replaced under this warranty are warranted for the remainder of the original
warranty period. PS Engineering, Inc. reserves the rights to make modifications or improvements
to the product without obligation to perform like modifications or improvements to previously
manufactured products.
Factory Service
The units are covered by a two-year limited warranty. See warranty information. Call PS Engineer-
ing, Inc. at [phone] before you return any unit. This will allow the service technician to
provide any other suggestions for identifying the problem and recommend possible solutions.
After discussing the problem with the technician and you obtain a Return Authorization Number,
ship product to:
PS Engineering, Inc.
Attn: Service Department
9800 Martel Rd.
Lenoir City, TN 37772
[phone] FAX [phone]
Email: [e-mail]
Units that arrive without an RMA number, or telephone number for a responsible
contact, will be returned un-repaired. PS Engineering is not responsible for items
sent via US Mail.

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