
PS Engineering
PAC45J Audio Selector Panel and Intercom System
Installation and Operator’s Manual
200-045-2000
Page 2-4
November 2020
2.4.3.2
Installation with Monaural Headsets
Not recommended
, because the benefit of MultiTalker is lost.
However, if desired, the PAC45J can be installed monaurally by using the right and left
outputs together. However, the HUB45AR DIP switches must be set for Mono configura-
tion. See §
NOTE These companies adapt monaural helmets and headsets to stereo:
Lightspeed Avionics
Phone: 800-332-2421
Acousticom
Phone: 574-293-0534
FLIGHTHELMET.COM
Phone: (800) 531-4898
Headsets Inc.
Phone: 800-876-3374
2.4.4
Backlighting
Control of the unit backlighting is through the aircraft avionics dimmer through a single connection to the
HUB45A. A serial message is sent to the control heads to adjust the dimming.
For lighting control, connect J452-22, wrt J452-1 to aircraft dimmer.
Backlight voltages of 5 VDC, 14 VDC and 28 VDC are configurable. See
2.4.5
Unswitched inputs
These inputs are presented to the pilot and copilot regardless of the audio configuration and will always mute
the crew entertainment inputs. These 510Ω inputs can be used for altimeter DH audio, TAWS audio, TCAS
audio or any other critical audio signal.
Unswitched #1 is always presented to the crew headphones and is available to the pilot in fail-safe (off) mode.
Unswitched 2 is presented to the copilot in fail-safe.
Unswitched Input
Input Pins
Hear in Fail Safe
Hear in Headset
1
P452 - 55
WRT
15
Pilot
Pilot & Copilot
2
P452 - 35
WRT
16
Copilot
Copilot
3
P452 - 56
WRT
17
No
Pilot & Copilot
4
P452 - 36
WRT
18
No
Pilot & Copilot
5
P452 -57
WRT
19
No
Pilot & Copilot
Table 2-2 Unswitched inputs
2.4.6
Cockpit Voice Recorder
The PAC45J audio controller contains independent Cockpit Voice Recorder outputs for the pilot, copilot and
observer positions. The CVR output is consistent with RTCA DO-214A §1.5.7.
Pilot CVR output is J452-60; Copilot CVR output is P452-61, Observer 1 CVR output P452-39, and Observer
2 P452-40, all with respect to any available audio low on J452.
NOTE: Observer 1 and Observer 2 CVR outputs are dual purpose and mutually exclusive with Copilot
speaker output and Observer speaker outputs.
See §2.7.14 for information on selecting low-level speaker or CVR outputs.
2.4.7
Speaker Outputs
The HUB45A is capable of providing three separate speaker outputs, plus Public Address. However, two are
dual purpose and mutually exclusive with copilot and observer CVR outputs.
Cockpit Speaker, P452-41 a 4Ω, 10W output, with the radio audio selected by the
Pilot’s
CTL45J Control
Panel.
When enabled, P452-40 is a low-level (10KΩ, 2Vpp max) speaker output with the radio audio selected on
the
Copilot’s
CTL45J Control Panel.