PS Engineering
PMA450C Audio Selector Panel and Intercom System
Installation and Operator’s Manual
200-450-0800
Page 2-6
July 2022
Whenever the wired telephone/satellite is active, the telephone configuration will appear on the OLED screen
for dynamic adjustments to volume and sidetone as needed.
Both Bluetooth and wired Telephone and be accommodated, however, only ONE can be active at a time.
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 panel end only, and tie to the audio low inputs as shown.
2.4.12 Music Inputs
The PMA450C has
four
available music inputs. Music input number 1 is J2 pins 23 (left channel) and 24
(right channel), with respect to pin 25, and Music number 2 is connected to 26 (left channel), 27 (right chan-
nel), with respect to 28, plus Bluetooth® modules to stream music from a paired device.
N O T E
U s e t h e l o w - l e v e l o u t p u t o f a n y a d d i t i o n a l M u s i c d e v i c e t o c o n n e c t t o t h e a u d i o p a n e l .
M a x i m u m s i g n a l l e v e l i s
3 V A C
p - p .
D O N O T
u s e a s p e a k e r - l e v e l o u t p u t ; t h i s w i l l
c a u s e i n t e r n a l d a m a g e i n t h e a u d i o p a n e l .
CAUTION
Local oscillators and internal signals from Music 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, immediately switch off the entertain-
ment devices.
All additional entertainment devices must be switched off for both takeoff and landing.
2.4.12.1 Passenger Mute (J2 Pin 13 & 14)
Connecting J2 pin 13 to pin 14 (or ground) through a SPST switch places the Passenger music source into
the Karaoke Mode. In this mode, incoming music and intercom conversation will not mute the music for the
passengers’ intercom net. This is useful for passenger-area control of the music muting, and overrides the
PMA450C Music Mute menu-controlled setting.
2.4.13 Playback button Installation (J2 Pin 22)
The pilot and copilot can hear the aircraft radio playback.
The Internal Recorder System can be played back from the front panel by pressing the RCV button of the
radio selected for transmission.
Alternatively, a remote, momentary, normally open (NO) push button switch may be installed if desired to
activate the Recording System playback. This switch can be located anywhere in cockpit convenient to the
pilot's reach. The NO switch should be connected to pin 22 of J2 of the PMA450C, and ground. When in-
stalled, this button will act as in §
2.4.13.1 Cell phone Sidetone
The PMA450C provides cellular telephone sidetone (the user’s voice fed back to the headset). Some cell
phones provide sidetone and may have poor audio quality if both sources are combined. The cell phone
sidetone is adjustable in the Bluetooth® operation screen
Marker Beacon Installation (050-450-0801, Only)
2.5.1
Marker Antenna Installation
A marker beacon antenna, appropriate to the type and speed of the aircraft, is required (not included). Refer
to aircraft and antenna manufacturer's installation instructions, as well as AC43.13-2B (or later revision),
Chapter 3, for information on proper antenna installation techniques. The marker beacon antenna must be
mounted on the bottom of the aircraft.
