PS Engineering
PMA450C Audio Selector Panel and Intercom System
Installation and Operator’s Manual
200-450-0800
Page 3-11
July 2022
When the PMA450C is first powered on, an auto connect sequence attempts to connect the BT to previously
paired devices. During this period, connection times may vary from 10 seconds to 1 minute. Although the
PMA450C can store up to eight devices, we recommend limiting the number if practical. During start-up,
the PMA450C will look for each previously paired device, which may slow connection time.
Hint, if your old phone is not recognized by the PMA450C, you may need to reset from the Bluetooth menu.
3.10.1.1 Pairing separate music and telephone devices (BT1)
It is possible to use a different music source (iPad, iPod with Bluetooth adapter, Bluetooth enabled laptop,
etc.) and telephone. However, only one music source can be streaming at a time.
NOTE: A previously paired iOS Hands Free device may experience from one to several connect/disconnects
sequences when the PMA450C is first powered on. This is normal and will result in the device remaining
connected when the auto connect process is completed.
If two iOS devices are paired and connected to the PMA450C, and one of them does not auto connect on the
next power cycle (perhaps it isn’t in the airplane, or the Bluetooth is turned off), it will be ignored until it is
reconnected manually.
3.10.1.2 Paring music devices (BT2 available in -0801 & -0901 only)
The PMA450C incorporates a second Bluetooth Module, Labeled as BT2. This module supports entertain-
ment audio input as well as audio streaming
As delivered by the factory BT 2 is set for music input. The Module is labeled PMA450C BT 2, with the
last four digits of the serial number. This can be relabeled in the User Setup Menu.
Bluetooth® Telephone Mode
The PMA450C 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 op-
eration 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.”
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 (unless in Alternate Intercom Mode).
In
CREW
mode, the pilot and copilot are connected to the telephone. The pilot and copilot will have trans-
mit capability on the selected transceiver, Com 1 or 2, simply by using their respective PTT switch.
In
ISO
intercom mode, when the PMA450C 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 personal cellular telephones.
3.11.1 Bluetooth Reset
If Bluetooth devices have trouble connecting, it may be necessary to reset the Bluetooth Module. The
PMA450C Bluetooth Reset function is accessible from the setup menu.
During the unit boot up process (while the version numbers appear on the screen), press the lower line select
button.
This places the unit into the “User Setup Mode- home screen”, and allows resetting the Bluetooth Module
