Section iii operation, Scope, Communications transmit (xmt) selection (2) – PS Engineering PMA8000MP3 Installation Manual User Manual

Page 22: Section iii operation -1, Scope -1, Ommunications, Ransmit, Xmt), Election, 1 scope

PS Engineering

PMA8000B-MP3 Audio Selector Panel and Intercom System

Installation and Operator’s Manual

200-890-0600

Page 3-1

Rev. 6, Oct. 2010

Section III OPERATION

3.1 SCOPE

This section provides detailed operating instructions for the PS Engineering PMA8000B-MP3, Audio
Selector Panel/Marker Beacon Receiver/Intercom Systems. Please read it carefully before using the
equipment so that you can take full advantage of its cap abilities.

This section is divided into five sections covering the basic operating areas of the PMA8000B-MP3 sys-
tems. They are Communications Transceiver Selection, Audio Selector, Intercom, Marker Beacon Re-
ceiver, and special functions.

Figure 3-1 PMA8000B-MP3 Operating controls

Unit power is turned on and off by pushing the volume knob. In the

OFF

or "EMG" position, the pilot

headset is connected directly to Com 1 as well as unswitched input #1. This allows communication capa-
bility regardless of unit condition. Any time power is removed or turned

OFF

, the audio selector will revert

to fail-safe mode.

The power switch controls all audio selector panel functions, intercom and marker beacon receiver. Al l
pushbutton selections and function modes will be remembered and return to the last state when turned on.

3.2 Communications Transmit (XMT) Selection (2)

There are two pushbuttons associated with the transmitter selection. The two lower buttons (# 2) control
which transceiver is selected for transmit. The top row of pushbuttons (# 3) allows selection of the receiver
audio. Push the lower button to select the desired COM transmitter.

The PMA8000B-MP3-Series has an automatic selector system. Audio from the selected transceiver is
automatically heard in the headsets and speaker (if selected). You can check this function by switching
from C

1 transmitter to Com 2 transmitter by pressing the C

2 transmitter selector pushbutton. See

that the associated Com 2 receive pushbutton indicator light that is located immediately above the Com 2
transmitter pushbutton turns green. This guarantees that the pilot will always hear the audio from the
transceiver selected for transmit.

The PMA8000B-MP3 “remembers” the receiver selection, so that when switching transmitters from C

1 to C

2, if C

2 audio was previously selected, C

1 audio will continue to be heard. This elimi-

nates the pilot having to switch Com 1 audio back on, after changing transmitters.

When switching from C

1 to C

2 while Com 2 was not previously selected, C

1 audio will be