Avidyne AMX240 Manual

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AMX240 Audio Panel | PILOT GUIDE
TABLE OF CONTENTS
SYSTEM OVERVIEW......................................................................1
FUNCTIONAL OVERVIEW .............................................................1
BEZEL CONTROLS ........................................................................2
Pilot Volume Knob ................................................................................... 2
Copilot/Passenger Volume Knob ............................................................. 3
Transceiver Selection .............................................................................. 3
Split Button .............................................................................................. 5
Monitor Buttons........................................................................................ 6
Navaid Receiver Selection Button............................................................ 6
Speaker Button ........................................................................................ 7
Marker Beacon Button ............................................................................. 8
Mute Button ............................................................................................. 8
Intercom Isolate Button and Display......................................................... 9
Music Button.......................................................................................... 10
Telephone Button................................................................................... 10
Replay Button ........................................................................................ 11
POWER ON/OFF...........................................................................12
ADDITIONAL FUNCTIONS ...........................................................13
Integration with Avidyne IFDs................................................................. 13
Intercom................................................................................................. 14
Unswitched INputs................................................................................. 14
Marker Beacon ...................................................................................... 15
Auxiliary Inputs ...................................................................................... 16
Music Distribution................................................................................... 16
Bluetooth® Pairing and usage................................................................ 20
Front Panel Jack- “Smart Jack”.............................................................. 21
BRIGHTNESS AND LIGHTING CONTROLS ................................22
ABNORMAL OPERATIONS ..........................................................22
Fail Safe Operation................................................................................ 22
PLUG AND PLAY DETAILS ..........................................................23
INDEX……………..........................................................................25

1
SYSTEM OVERVIEW
This manual assumes that the pilot is appropriately licensed, is
proficient in operation of the aircraft and its equipment, and is in
compliance with all Federal Aviation Regulations (FARs).
All images contained in this manual are for reference use only,
and are subject to change.
Avidyne strongly recommends that pilots use the AMX240 system
only under VFR conditions until completely familiar with its
operation and use.
Boxed areas marked as NOTE within this manual identify certain
situations or areas of operation having safety implications. While
it is important for the operator to be familiar with all of the
information in the manual, it is essential to the safe use of the
AMX240 that pilots give careful attention to the material contained
within these NOTEs.
AMX240 Audio Panel
The AMX240 is a panel-mount audio panel that meets all the
requirements for both IFR and VFR flight.
FUNCTIONAL OVERVIEW
The Avidyne AMX240 Audio Panel supports the following
functions:
•Dual Transceiver Support;
•6-position Intercom System;
•Monitor Capability;
•Split Mode;
•Cockpit Speaker Control;

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•Marker Beacon Receiver and Audio Control;
•Crew Isolation;
•Full-duplex telephone (wired and Bluetooth®) Support;
•Bluetooth® Music Support;
•Music Source Selection;
•Muting Control;
•Audio Replay;
•External Audio Jack Support.
COOL FEATURE
Automatic Squelch Control
The PS Engineering designed intercom squelch
control monitors each microphone input and
instantly opens when human speech is detected.
This results in no clipping of initial speech or
excessive noise. Nor is there any need for manual
squelch adjust.
BEZEL CONTROLS
PILOT VOLUME KNOB
The left knob on the bezel controls the pilot position intercom
volume. Max volume is reached at the clockwise stop. Minimum
volume is reached just prior to the full counter-clockwise detent
stop.
There is a white tick mark that indicates the current volume
setting.

3
NOTE
Full Counter Clockwise Detent is Power On/Off
Use care when adjusting the pilot position intercom
volume to avoid inadvertently reaching the full
counter-clockwise detent which powers the unit off.
COPILOT/PASSENGER VOLUME KNOB
The right side knob on the bezel is a dual concentric knob where
the outer knob controls the passenger positions intercom volume
and the inner knob controls the co-pilot position intercom volume.
Max volume is reached at the clockwise stop and minimum
volume is reached at the counter-clockwise stop.
There is a white tick mark that indicates the current volume
setting.
TRANSCEIVER SELECTION
Transceiver Selection Controls
There are two pushbuttons associated with the transmitter
selection. The two left buttons (MIC 1 & MIC 2) control which
transceiver is selected for transmit. The right column of
pushbuttons (COM 1 & COM 2) allows selection of the receiver
audio. Push the MIC button to select the desired transmitter.
The AMX240 has an automatic selector system. Audio from the
selected transceiver is automatically heard in the headsets and
speaker (if selected). When switching from MIC 1 transmitter to
MIC 2 transmitter by pressing the MIC 2 transmitter selector

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pushbutton, the associated COM 2 pushbutton indicator will turn
green. This guarantees that the pilot will always hear the audio
from the transceiver selected for transmit.
The AMX240 “remembers” the receiver selection, so that when
switching transmitters from MIC 1 to MIC 2, if COM 2 audio was
previously selected, COM 1 audio will continue to be heard. This
eliminates the pilot having to switch Com audio back on, after
changing transmitters.
When switching from MIC 1 to MIC 2 while COM 2 audio was not
previously selected, COM 1 audio will be switched off. In
essence, switching the mic selector will not override prior
selection of COM receiver audio.
If both COM 1 and COM 2 are selected for receive, then both will
be heard equally.
The selected MIC button will flash green during com
transmission.
In normal (not split) modes, the AMX240 gives priority to the
pilot’s radio Push-To-Talk (PTT). If the co-pilot is transmitting, and
the pilot presses their PTT, the pilot’s microphone will be heard
over the selected com transmitter.
The co-pilot will also be able to transmit on the selected radio with
their PTT as well.

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SPLIT BUTTON
Split mode allows the pilot to transmit on COM 1 while the co-pilot
transmits on COM 2.
Irrespective of the previous selections, selecting SPLIT will place
the pilot position on COM 1 and the co-pilot position on COM 2.
When SPLIT is active, the following buttons will be green:
MIC 1, COM 1, MIC 2, COM 2.
When the split mode is activated, the intercom between the pilot
and co-pilot is inhibited, although the passengers can still talk
among themselves. This is indicated by the intercom segment
lights all turning off.
The SPLIT button does not light up in green when active.
The crew intercom can be reactivated if desired by pressing the
“ISOL” button as required to get the PLT to CPLT segment to light
in green.
NOTE
No Intercom Segments Lit in Split Mode
When first pressing SPLIT mode, all Intercom
segments are turned off. Pressing the ISOL button
will re-enable intercom during SPLIT mode between
the PLT and CPLT positions.

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MONITOR BUTTONS
MON 1 and MON 2 monitors audio output from the COM 1 and
COM 2 IFD Standby channel(s).
The buttons turn green when active.
Dual radio monitor capability allows the pilot to listen to the
standby frequency while still being able to transmit and receive on
the primary frequency.
NAVAID RECEIVER SELECTION BUTTON
These buttons select audio from desired nav radio source to be
heard in the headsets.
Each button turns green when active.
Change 1

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SPEAKER BUTTON
Selecting this button places the radio audio that is selected by the
pilot over the cockpit speaker.
The button turns green when the speaker function is active.
If the SPKR button is held for more than 1 second, the unit enters
the Public Announcement (PA) Mode. In PA mode, the pilots mic
audio is passed over the cockpit speaker, and to all the headsets
(assuming the intercom is in ALL mode) when the pilot presses
the PTT. The co-pilot can transmit over the selected radio in PA
mode.
When in PA mode, the SPKR button will flash green.
To exit PA mode, press and hold the SPKR button for greater
than one second.

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MARKER BEACON BUTTON
:
The Marker Beacon function is always active. The MKR button
just controls the audio part of the Marker Beacon.
A quick push of the button selects Marker Beacon audio.
Pressing and holding the button for more than 1 second will mute
the Marker Beacon audio and activate a lamp test which will light
out the Outer, Middle and Inner Marker Beacon lamps. The audio
stays muted until next beacon station received.
The MKR button turns green when Marker Beacon audio is
selected.
MUTE BUTTON
Pressing the Mute button sends a signal to any external alerting
system that is connected to the AMX240 audio panel. Examples
include traffic systems, TAWS/EGPWS systems, autopilots, etc.
When pressed, the MUTE button turns green for approximately 1
second while the external mute command is sent.
This button has no effect on Marker Beacon audio or Music. It will
stop Replay playback.

9
INTERCOM ISOLATE BUTTON AND DISPLAY
The ISOL key selects the intercom mode. It has three states: All,
Crew and Pilot Isolate.
In All, all three LED segments are lit and all positions are on a
shared intercom.
In Crew, the LED segment connecting PLT and CPLT is lit and
the usable intercom is between those two positions.
Note that the passengers can talk amongst themselves but
cannot hear the crew. Passengers will also not hear the
transceiver in this case.
In Pilot Isolate, the LED segment connecting CPLT and PAX is lit
and the usable intercom is just between those positions.

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MUSIC BUTTON
The MUSIC button cycles through the music muting modes.
When selected and lit up in white, music will
mute with either
Intercom or External Radio input.
Mute on is the default state
when power is applied.
Music can also be put in a Mute Off - “Karaoke”
mode in
music will
continue to be heard during radio and intercom
conversation. Music will be in
the background in this case at all
times, except when the crew is actually transmitting out the
airplane. In this mode, the button is GREEN.
♫Music Intercom Radio
Button
Mute Muted Muted
WHITE
Mute Off
(Karaoke) ♫♫
GREEN
TELEPHONE BUTTON
This button is used to answer or place a call with
the telephone
(wired or Bluetooth®).
In ALL intercom mode, all crew and passengers will
hear the
telephone party on the other end and will be heard by the
telephone party when they speak
. Com and other selecte
audio is also heard in the headsets
. The telephone party will not
hear ATC communications, and vice versa.
The MUSIC button cycles through the music muting modes.
mute with either
Mute on is the default state
mode in
which
continue to be heard during radio and intercom
the background in this case at all
times, except when the crew is actually transmitting out the
Button
WHITE
GREEN
the telephone
hear the
telephone party on the other end and will be heard by the
. Com and other selecte
d radio
. The telephone party will not

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In CREW mode, only the pilot and copilot are connected to the
telephone. Passengers will not hear the telephone. The pilot and
copilot will also have transmit capability on the selected com
transceiver.
In Pilot Isolate intercom mode, when the AMX240 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 to the pilot.
REPLAY BUTTON
,
This is the “say again” function that repeats previous ATC
communications.
The AMX240 stores the last 8 incoming audio messages (up to a
total maximum of 45 seconds of audio) from the radio you have
selected for transmit. The pilot and copilot hear the playback.
To play back the last recorded message, press the REPLAY
pushbutton. You can either wait for the message to finish playing
before accessing the prior message, or cancel the current
playback and step backward. To cancel the playback, press and
hold the playback button for two seconds. The next time the
button is pressed the next earlier message will be heard.
The playback will stop whenever there is more incoming selected
com audio, and the message can be replayed from the beginning
by pressing the REPLAY button. Playback can also be stopped
by pressing the MUTE button or holding the REPLAY button for
for more than 2 seconds again.
The Replay button color does not change from WHITE.

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POWER ON/OFF
The AMX240 will automatically power on when avionics power is
applied and perform a quick self-test.
Following a successful power-on self-test, the AMX240 will
default to the last configuration prior to the previous shutdown.
To manually power the AMX240 off, twist the Pilot Volume knob
to the full counter-clockwise position until the detent is felt/heard.
To manually power the AMX240 on following a manual power off,
twist the Pilot Volume knob clockwise out of the OFF detent.

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ADDITIONAL FUNCTIONS
INTEGRATION WITH AVIDYNE IFDs
The AMX240 is designed for tight integration with the Avidyne
Integrated Flight Displays (IFDs). When connected to an IFD, the
AMX240 enables Com frequency decoding and frequency
monitoring of the two transmit and four receive channels of the
IFD com radio. This means that the active Com frequency and
agency name are displayed on the IFD so you always know with
whom you will be talking when you transmit.
IFD540 Integration
R9 Integration

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INTERCOM
The AMX240 intercom is a 6-place high-fidelity stereo or mono
intercom with automatic voice-activated (VOX) squelch for each
mic input.
As described earlier, dedicated knobs for the pilot, copilot and
passenger intercom volumes allow for full customization for
personal preferences without relying on headset volume controls.
The AMX240 includes an “Alternate Intercom Function” which
allows the passengers to converse with the crew intercom without
also hearing aircraft radio traffic, and the crew will not hear the
passengers while the aircraft radios are also active.
To activate this “Alternate Intercom Function”, press and hold the
ISOL button for two seconds while in the ALL intercom mode (all
segments green). The PLT to CPLT segment will blink to indicate
this mode is active. This function is remembered through power
cycles.
UNSWITCHED INPUTS
Unswitched inputs are presented to the pilot and co-pilot
regardless of the audio configuration or selections. If audio
comes in via one of the unswitched/unmuted lines, any
entertainment audio is instantly muted.
“Unswitched” refers to the fact the input audio is not affected by
audio panel mode/button selections.
“Unmuted” refers to input audio not being muted by radio
transmitter keying.
Unswitched #1 is always presented to the speaker, and the crew
headphones, and is available to the pilot in fail-safe (off) mode.
Unswitched #2, is always connected to the Crew’s headphones.
However, this unswitched audio is only presented to the aircraft
speaker when the SPKR push button has been selected.

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Unswitched #3 and #4 inputs are always presented to the crew
headphones and to the aircraft speaker.
Unswitched
Input
Hear in
Fail Safe
Hear in
Crew Headset
SPKR button
Select
1 Yes Yes No
2 No Yes Yes
3 No Yes No
4 No Yes No
5 (jack) No Yes No
MARKER BEACON
The Outer marker will light up the “O” lamp and present a 400 Hz
dash tone. The lamp and tone flash on/off at a rate of 2 tones
and flashes per second.
The Middle marker will light up the “M” lamp and present a 1300
Hz alternating dot and dash tone. The combination dots and
dashes will be at a rate of 95 per minute.
The Inner marker will light up the “I” lamp and present a 3000 Hz
dot tone. The lamp and tone flash on/off at a rate of 6 tones and
flashes per second.
Marker Beacon sensitivity is defaulted to LO and is only changed
via an optional external cockpit switch.

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AUXILIARY INPUTS
ADF audio, if wired, will be heard on MON 1.
DME audio, if wired, will be heard on MON 2.
MON 1 and MON 2 will both be heard at the same time if both
buttons are selected. Note that MON 1 and MON 2 are
connected either to the standby audio output from the radio OR
the ADF/DME so you will not hear both the COM standby and
ADF or DME.
HF audio, if wired, will be heard via the wired Telephone button.
MUSIC DISTRIBUTION
Music 1 can be the rear connector (J2, pins 23, 24, 25), the front
panel jack, OR a Bluetooth®music stream. The three inputs are
paralleled, so if more than one device is connected, all will be
combined into the audio (not recommended).
Music 2 is only sourced from the rear connector (J2, pins 26, 27,
28). Music 2 is presented only to the passengers, and cannot be
presented to the crew positions.
Music 1 is presented to the pilot and co-pilot unless “Music One
All Headsets” music distribution is selected.