
PS Engineering
PAC45J Audio Selector Panel and Intercom System
Installation and Operator’s Manual
200-045-2000
Page 2-2
November 2020
2.3.3
Audio controller connector assembly
The HUB45AR LRU connectors mate with two 62-pin, and two 26-pin connectors. One of each gender. The
connectors are a sub-miniature crimp-type, and require the use a hand crimp tool, from table below (or
equiv.).
P451
P453
J454
J452
1
21
22
43
62
42
1
21
22
43
62
42
1
9
19
26
10
18
19
26
10
18
1
9
Figure 2-1 - PAC45J HUB45AR Connector Layout
Manufacturer
Crimping Tool
Positioner
Extraction tool
AMP
601966-1
601966-6
91067-1
Daniels
AFM8
K42
M24308-1
ITT-Cannon
995-0001-584
995-0001-739
91067-1
Table 2-1 Connector Pin crimping tools
2.4 Cable Harness Wiring
Referring to the appropriate Appendix, assemble a wiring harness as required for the installation. All wires
must be MIL-SPEC in accordance with current regulations. Two- and three-conductor shielded wire must be
used where indicated and be MIL-C-27500 or equivalent specification. Proper stripping, shielding and sol-
dering technique must always be used. It is imperative that correct wire be used.
Refer to FAA Advisory Circular 43.13-2B for more information. Failure to use correct techniques may result
in improper operation, electrical noise or unit failure. Damage caused by improper installation will void the
PS Engineering warranty.
See Appendix C and D for intercom connection configurations. It is critical to the proper operation of this
system to have this connector wiring made in accordance with these diagrams. Use 2- and 3-conductor, MIL-
spec cable as shown. Connect the shields at the audio controller end only, and tie to the audio low inputs as
shown.
2.4.1
Electrical Noise
Due to the variety and the high power of radio equipment often found in today's aircraft, there is a potential
for both radiated and conducted noise interference.
The PAC45J power supply is specifically designed to reduce conducted electrical noise on the aircraft power
bus by at least 50dB. Although this is a large amount of attenuation, it may not eliminate all noise, particularly
if the amplitude of noise is very high. Shielding can reduce or prevent radiated noise (i.e., beacon, electric
gyros, switching power supplies, etc.) However, installation combinations can occur where interference is
possible. The PAC45J was designed in an RFI hardened chassis and has internal Electromagnetic Interfer-
ence (EMI) filters on all inputs and outputs.
Ground loop noise occurs when there are two or more ground paths for the same signal (i.e., airframe and
ground return wire). Large cyclic loads such as strobes, inverters, etc., can inject noise signals onto the air-