XCOM 760 User manual

XCOM 760
VHF Transceiver
Hardware Revision 1.10
Software Rev. 1.20 Build 46
Installation and Users Manual
XCOM Avionics
Factory 4, No. 24 Leda Drive. Leda Business Park
Burleigh Heads, Queensland Australia 4226.
Phone [phone] Fax [phone]

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Table of Contents
Introduction.................................................................................................4
Features Overview ........................................................................................4
Manual Release Information ...........................................................................5
Package Contents .........................................................................................6
User Manual.................................................................................................6
Warranty Card..............................................................................................6
Description ..................................................................................................6
Front Panel Controls and Switches...................................................................7
Emergency Frequency..............................................................................7
LCD Display .................................................................................................8
TX (Transmit) Icon ..................................................................................8
RX (Receive) Icon....................................................................................8
DUAL WATCH..........................................................................................8
LOW BATT..............................................................................................8
MEM......................................................................................................8
Middle Line.............................................................................................8
Bottom line ............................................................................................8
XCOM Installation .........................................................................................9
Wiring Harness.............................................................................................9
Antennas................................................................................................... 10
Radio Frequency Hazard Information........................................................ 10
Radio Ground Strap ............................................................................... 10
Operating your XCOM Transceiver................................................................. 10
On ...................................................................................................... 10
MODE.................................................................................................. 10
MEM.................................................................................................... 11
DUAL................................................................................................... 11
Flip Flop button (Ú)............................................................................... 12
Memory Programming ................................................................................. 12
Introduction ......................................................................................... 12
Operation............................................................................................. 12
Clearing Memories................................................................................. 13
Memory Scanning ....................................................................................... 13
Introduction ......................................................................................... 13
Starting Memory Scan............................................................................ 13
Stopping Memory Scan .......................................................................... 13
Setup Options ............................................................................................ 14
Introduction ......................................................................................... 14
Operation............................................................................................. 14
Antenna Information ................................................................................... 16
Wiring Diagram – Typical Installation............................................................. 18
XCOM VHF Transceiver Specifications - Subject to Change................................ 19
Drilling Template ........................................................................................ 24
Notes........................................................................................................ 25
Warranty Card............................................................................................ 26

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Introduction
Thank you for purchasing the XCOM 760 VHF Transceiver. This manual describes
the operation and installation of the product. Should you have any questions that
are not answered in this manual, please contact XCOM Avionics in Australia on
[phone] or by email to [email protected]. As this product is new, there
are continual developments and changes still being made so XCOM recommends
checking the website for the latest edition of this manual.
The XCOM 760 VHF Transceiver is the second of several innovative avionics
products to be released by XCOM Avionics. Based on the features of the very
successful Microair and Becker radios, the XCOM 760 offers many advanced
features previously only available in the more expensive brands.
Designed from the ground up in Australia, the XCOM 760 offers superior
performance under the demanding and noisy conditions experienced in many
amateur built and light sport aircraft. With low power consumption, this radio is
also ideally suited to use in gliders, homebuilts and ultralights.
A full 6 watt carrier output ensures that you will be heard above the general chatter
in busy airspace and the voice-activated (vox) intercom with muting music input
will enhance your enjoyment of the flight. With expanded receive frequency range
up to 163 MHz. the XCOM 760 provides NOAA weather reception, ensuring that you
are always aware of impending weather conditions (NOAA weather only operates in
the USA), and will have an optional MARS/CAP capability to be introduced in future
releases.
Additional safety enhancements, such as dual watch, allow the pilot to listen to the
standby frequency while still monitoring the primary frequency. The XCOM 760 also
has 99 memory channels, large volume and channel selector knobs and well spaced
buttons. This radio is extremely easy to operate, even when wearing flight gloves,
and you can even check the condition of your battery with the built in voltage
monitor. Even at voltages as low as 10 volts, the XCOM 760 is capable of delivering
2 watts of carrier with full modulation.
Software update capability and Internet downloads mean that you are always
provided with the latest features.
Features Overview
•Digital volume and squelch controls on front panel
•Digital volume and vox intercom controls on front panel (same volume
squelch control, but activated by mode button when required).
•2 place voice activated intercom, with pilot over-ride and passenger (pax)
isolate (pax can listen to cd music while pilot listens to com). Dual mode input
line for cd or second com input. Cd music has auto fade, turns off if com is
receiving and reduces in volume if pilot or pax talk.

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•Remote toggle (toggle active or standby or scroll memory channels via a push
button on the stick – only available when copilot PTT is not used)
•Transmitter (TX) timeout (stuck mic) which turns off transmitter after 30
seconds (user adjustable). TX is re-enabled by releasing and re-pressing PTT.
•99 memory channels (10 NOAA, 1 priority 121.500 and 88 user defined
memory channels).
•Memory channels scanning.
•10 preset NOAA weather channels (suitable for USA only)
•Dual Watch - allows monitoring of the active frequency while listening on the
standby frequency. The active frequency has priority.
•User enabled wide receive mode - allows monitoring of the VOR frequencies
between 108 and 118 MHz., the normal airband up to 137 MHz. and then up
to 163 MHz., in 25 kHz. steps. All frequencies, when enabled, can be stored in
memory channels.
•RS232 interface allowing control of radio functions and programming of
memories. Future revisions may allow upgrade of the internal firmware via
internet download. (This feature to be introduced during 2005/6)
•Low battery alert with user selectable alert levels for under voltage (default is
10.5 vdc.) and over voltage (default is 14.5 vdc.)
•Optional MARS / CAP capability (special order to be introduced during 2005/6
subject to FCC approvals)
XCOM Avionics reserves the right to update this manual as product enhancements
are made throughout the life of this product. The actual release number of this
manual is printed on the bottom of the pages for easy reference and the latest
version can always be downloaded from the XCOM web site.
Please note that this manual is accurate for the software version denoted on the
front cover page. Features may vary between software versions and some features
may not be available in all XCOM radios.
Manual Release Information
Release Date Changes
1.0 January 04 Original draft of document
1.1 May 04 Release of manual to public
1.2 July 04 Addition of aerial safety information re: FCC Request
1.3 July 04 Addition of certification approvals FCC and FAA
1.4 December 04 Addition of new features in manual, release Version 120 software
1.5 January 05 Fixed wrong number for Low Volts page 13
1.6 June 2005 Updated to Software version 120 build 0034
1.7 July 2005 Spelling and grammar changes

Package Contents
The XCOM 760 is packed in an anti-static bag, for electrical protection, and
enclosed in foam within a cardboard box for protection during shipping.
The boxed contents are….
•One XCOM 760 VHF transceiver
•User manual
•DB15 solder plug and plastic back shell
•Optional: If you purchased the optional wiring harness it will be included in
this package with installation instructions.
User Manual
Please read and understand this manual BEFORE attempting to install and operate
this transceiver. The XCOM VHF 760 has many advanced features which, if not
properly understood, could cause improper operation or damage to this product.
Warranty Card
Included in the rear of this manual is the warranty card. Please fill out your details
and return to the manufacturer’s address provided. Please don’t return the card to
your dealer. Alternatively you may fill in the warranty details online through the
website at http://www.xcom760.com (select warranty registration).
Description
The XCOM VHF 760 Transceiver has a 2.25” (57mm) face for fitting in a normal
aircraft small instrument hole. The case is 5.1” (129mm) long, 2.4” (61mm) wide
and 2.4” (61mm) high. The unit is secured to the aircraft dashboard by 4 screws
and is self supporting, requiring no additional supports, trays or brackets.
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Front Panel Controls and Switches
nDUAL - Press once to activate dual receive
capability. The DUAL WATCH icon will be
illuminated in the LCD Screen. Press again to
de-activate.
oON - Press for 1 second to turn the
transceiver on. Depress for 2 seconds to turn
the unit off.
pMODE - Activates the various different
modes. See mode section below.
qMEM - Accesses the 99 memory locations.
See memory operation sections below.
rFlip Flop (Transfer) Press to transfer the
bottom line to the top and vice-versa. The top
frequency is the active transmit channel and
the bottom line is the standby frequency. (The
radio will not transmit on either the weather or
extended receive channels.) Also used as
escape from other screens.
sVOL/SQH - Default is transceiver volume.
Rotate the control to adjust the level
between 0 and 63. The default for normal
operation is 50.
To activate the squelch, press the knob in once
and the word will be displayed.
Rotate the control to the left to decrease and
open the squelch. Rotate to the right to
increase and close the squelch. Squelch values
range from 0 to 63 with the default for normal
operation around 30. After 3 seconds of no
activity the control reverts back to volume and
the screen returns to default. These controls
also adjust the intercom squelch and volume
when using the mode buttons as described
below.
tF/CH This control adjusts the standby
frequency. In normal use, rotating the control
adjusts the MHz. value. Press the control to
adjust the kHz. value. After 3 seconds of
inactivity the control will revert to MHz.
adjustment. See AdjAct section on page 14 for
additional information.
Emergency Frequency – Press both sand t
buttons together and you will automatically
activate the emergency frequency 121.5 –
press the flip/flop to exit.
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The rear of the radio has
nRS232 Port for future programming,
interface with external systems and
additional external control over the radio
oDB15 pin plug for connection of the
wiring harness
pBNC fitting for the antenna connection
LCD Display
TX (Transmit) Icon indicates that the
unit is transmitting. Note that after 30
seconds (default timeout) the unit will
automatically cease transmitting to
guard against a stuck or faulty PTT
switch.
RX (Receive) Icon indicates that a
signal is being received. Note that if the
squelch is fully opened (set at 0) then
the unit will continually receive either a
weak background signal or noise.
DUAL WATCH Lights up when the dual
watch button function is activated
LOW BATT indicates that the battery
voltage is low. A flashing icon indicates
that an over voltage situation exists.
MEM Indicates functions of the memory
modes. Please see below for additional
explanation.
Middle Line Displays the active
frequency
Bottom line Displays the standby
frequency and other status text.
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XCOM Installation
The XCOM 760 VHF Transceiver installation is straight forward and requires no
special skills. However installation of the wiring harness should be undertaken by a
suitably qualified person with the appropriate skills and test equipment. It is our
recommendation that installers purchase the factory manufactured wiring harness
or that owners have a local avionics repair or maintenance facility install the XCOM
760 for you.
When positioning the radio, ensure that the controls are within easy reach of the
pilot and in a suitable viewing angle when the pilot is sitting and secured in the
pilot’s seat. To mount the radio, position the supplied template on your panel and,
when satisfied with the location, drill and cut through the template in the marked
positions. The face hole is a standard 2.25” inches and the 4 securing holes are
drilled 5/32”.
Please check behind your panel for other components which may be damaged
during drilling.
The radio is mounted by insertion into the panel from the rear and is secured in
place by the 4 mounting screws supplied. Replacement screws are #6-32, 1/2“
long. Do not use longer screws as these may contact internal components and
cause damage to the unit.
Wiring Harness
The wiring harness is the most critical part of the installation and is where most
customers have difficulty. If you are unsure of how to complete this task, please
seek the advice of a qualified person or have the unit installed professionally. To
assist with installation, custom harnesses may be ordered direct from the
manufacturer.
If you decide to manufacture your own harness, please refer to the web site for
advice, techniques and wiring diagrams to assist you.
The following are some basic tips to get you started:
•Use aircraft quality Tefzel wire. This wire is specially manufactured for use in
aircraft with high quality insulation which will not create harmful vapors in the
event of a fire.
•Use 18 gauge (AWG) wire for all power supply connections
•Use wide braided wire for the grounding strap connected to the unit case
•Other wires should be 22 gauge.
•The antenna lead-in wire should be made from 50 ohm coaxial cable.
•Use high quality switches for toggle and PTT
•Use aviation quality headset and mike jacks (these are available from most
aviation suppliers or from our web site).

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Antennas
Correct operation of the transceiver requires a properly installed antenna suitable
for the frequency range from 118 to 137 MHz. On any new radio (or antenna)
installation, the VSWR of the aerial should be checked. The antenna VSWR should
preferably be no higher than 1.5:1 at the center of the aircraft COM band (127.2
MHz.). While no damage to the transceiver will occur with VSWR’s of 3:1, some
degradation in performance must be expected. There is more information on
antennas in the rear of this manual and on our website.
Radio Frequency Hazard Information
Regulations require a safe working distance between the pilot, copilot, passengers,
or the general public of at least 68 cm (27 inches) from the antenna location. If an
antenna gain of greater than 5.6 dBi is to be used, the antenna manufacturer
should be contacted to determine the minimum safe distance.
Radio Ground Strap
To prevent RF leakage into the radio, ensure that the radio chassis is well
grounded. Use a wide braided wire for the ground strap connected to the unit case
to ensure that a wide band of RF is grounded, which will prevent RF feedback from
entering the radio and causing squeals or other noise when transmitting.
Operating your XCOM Transceiver
On - To switch the unit on simply depress the ON button for one second. To switch
the unit off, hold the button in for 2 seconds. When power is applied, the
transceiver will start up in whatever mode it was in when power was last removed.
That is, if the unit was turned on when the power was removed, by turning off the
aircraft avionics or master switch, then when power is restored, the unit will again
switch on. If the unit was turned off when the power was removed, then the unit
will remain off when power is re-applied.
MODE - This is the main menu button for selecting various user options and for
displaying the voltage. Mode selections are cycled by depressing the MODE button
momentarily. To return to standard operation, press the Flip/Flop (Ú)button.
There are 6 Modes:
IntVol Intercom Volume. Rotating the VOL/SQH control will increase or
decrease the intercom volume.
IntSQH Intercom Squelch Rotating the VOL/SQH control will increase or
decrease the intercom squelch.
VoR On Receive VOR (audio only) This setting allows reception in the frequency
range 108 to 117.975 MHz. Push the F/CH knob to toggle the option
between On & Off. Rotating the F/CH knob clockwise accesses the
General Coverage option.

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Gen On General Coverage option is enabled. This extends the receive range
from 137.00 to 163 MHz. The receive sensitivity is reduced above 150
MHz. Above 137 MHz. the radio will receive in FM rather than AM. This
enables monitoring of the popular Amateur 2 meter band and marine
frequencies. Push the F/CH knob to toggle the option between on & off.
Rotating the F/CH knob anti-clockwise will return to the VOR option
screen.
VoLTS Shows the current voltage. Rotating the F/CH up or down will show the
high volts set point and the low volts set point.
Sidevol Adjusts the level of sound you hear through the headsets when
transmitting (sidetone). Generally this does not need to be adjusted
from the factory default value.
ScanCH Adjusts the number of memory channels to scan when memory
scanning is activated. Note that the priority channel 0 (121.500) is
always scanned.
MEM - Press this button once to access the 99 memory channels. The memory
channels are displayed with the channel number on the bottom line and stored
frequency on the top.
When accessed for the first time, the memory channel will show the priority or
emergency frequency 121.500 MHz. as this is stored as a factory default in memory
location 0. Subsequent returns to the memory screens will show the last accessed
memory channel.
Memory locations are cycled by rotating the F/CH knob. Only those locations which
have frequencies stored will be displayed. The top 10 locations, channels 90
through 99, contain the NOAA weather frequencies for use within the United States.
Channels 1 to 5 may be pre-stored with tuning frequencies used when your radio
underwent quality control and tuning. These may be overwritten at any time.
While in the memory screen, pressing the PTT will transmit on the current memory
frequency. Pressing and holding Úfor 2 seconds will enter the memory
programming mode (see below). Pressing Úmomentarily will simply return you to
the default screen with no memory channel loaded.
For details on how to program the memory channels, please refer to the memory
programming section below.
DUAL - When in the default screen, this button enables the dual watch function,
indicated by the DUAL WATCH icon.
When this function is active, the transceiver will receive on the standby frequency
and intermittently check the active frequency for activity. If a signal is received on
the active frequency, the transceiver automatically switches to that frequency.
When the signal ceases, the unit returns to the standby frequency and continues
scanning the active.

Transmission is only available on the active frequency so care must be taken not to
attempt to reply to a signal received on the standby frequency. To distinguish
between signals received on the standby frequency, the MHz./kHz. separator will
flash. No flashing will occur when receiving on the active frequency.
Note: When receiving on the standby frequency a slight clicking sound may be
heard intermittently. This is the scanning sound as the transceiver momentarily
checks the active frequency and is normal in this mode. This also serves as an
audio indication that any received station is on the standby frequency.
Holding the MODE button for 5 seconds while in the default screen will reset the
unit back to factory default settings. Memory channels will be retained but all other
settings will revert to the factory defaults. Upon successful reset, the screen will
show reset and the unit will turn off. Turn the unit back on by pressing the ON
button.
Flip Flop button (Ú)– Pressing this in the default screen will swap the active and
standby frequencies. When in MEM mode, pressing and holding it down for 2
seconds will transfer the currently displayed memory channel to the active
frequency in the default screen. In all other instances, this button serves as an exit
button to return to the default screen.
Memory Programming
Introduction - The XCOM 760 has 99 user programmable memory channels,
stored in non-volatile memory. The memory channels can be programmed via the
keypad or via the RS232 data link (using the serial port and Windows based
software). This section deals with the keypad entry method. Refer to the
xcomavionics.com website for software downloads and RS232 interface details.
Operation – To program the currently active frequency into a free memory
channel, simply press and hold the MEM button for 3 seconds while in the default
screen. The memory program screen will appear and the MEM icon will flash.
The display will show the frequency being
entered and the first free memory channel.
If all memory channels are occupied, then
channel 1 will be selected and the currently
stored frequency will be shown. Press MEM
again to overwrite the current frequency
with the newly entered frequency.
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The selected memory channel can be altered by rotating the F/CH knob. If a
channel is already occupied, the currently stored frequency will be shown. To
overwrite an occupied channel, press the MEM button. Channels 0 and 90 through

99 cannot be selected as these are preset with the priority and NOAA weather
frequencies respectively.
Pressing the F/CH knob scrolls between memory channel selection and frequency
adjustment. The selected item flashes to indicate adjustment. Rotate the F/CH
knob to adjust the selected item up or down.
To store the frequency in the currently selected memory channel, press and hold
the MEM button for 2 seconds. The display will show to indicate
successful entry.
To exit the memory programming screen, press Ú.
Clearing Memories – To erase all memory channels, excluding the Priority and
NOAA weather channels, turn off the unit by holding the ON button for 2 seconds
and then, while holding the MEM button, turn the unit on by pressing the ON
button. The display will show Erased and then return to the default screen and all
memory channels will be reset.
To clear individual channels, enter memory programming mode and adjust the
channel MHz. value down below the lowest available MHz. value (108 MHz. if VOR
Receive is activated or 118 MHz. if VOR Receive is deactivated). The word CLEAR
will appear in the display.
Press and hold the MEM button for 2 seconds. The display will show and
the channel will be cleared.
To exit the memory programming screen, press Ú.
Memory Scanning
Introduction - The XCOM 760 has 99 user programmable memory channels,
stored in non-volatile memory. These channels can be scanned sequentially. If a
signal is received in a channel, the scanning is paused. Scanning resumes 3
seconds after the signal is lost.
Starting Memory Scan – While viewing memories (see MEM section above),
press the F/CH knob to start memory scanning. The number of channels scanned
is determined by the ScanCH setting. This can be altered in the MODE as detailed
above. Note that the Priority channel (CH 0) is always scanned.
Setting a ScanCH value of 10 indicates that the first 10 memory channels will be
scanned, in addition to the Priority channel.
Stopping Memory Scan – Pressing the F/CH knob a second time will cease
scanning. Scanning will also be terminated if a PTT is pressed or if the MODE
button is pressed.
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Setup Options
Introduction
These advanced options should be modified only by experienced users.
Modification of these options affects the way in which the XCOM operates, the
features available, and may affect the performance of the unit. These options
should not be modified in flight.
Operation
To access the setup screens, turn the unit off using the ON button and, while
holding the DUAL and MODE buttons, turn the unit back on using the ON button.
The current software version, , will be displayed for a few seconds and then the
unit will enter the setup mode.
The following setup modes are cycled by pressing the F/CH knob:
•Int Enables or disables the intercom
•Side Enables or disables sidetone
•nb Enables or disables the noise blanker
•HiVolts Sets the alarm value for hi volts
•LoVolts Sets the alarm value for low volts
•Stuc Sets the stuck mike (transmit) timeout value
•Gain Adjusts the microphone gain
•Ptt2 Selects the copilot PTT mode
•Input Selects the line input mode
•AdjAct Enables or disables the adjustment of active frequency
Exit setup at any time by pressing the Úbutton.
Int
Option
On or Off
This selects the intercom on or off (Default is on).
Disabling the intercom reduces power consumption by disabling the
headset amplifier during normal use. This is particularly useful
when the unit is used in gliders or other battery powered
installations. When the Intercom is selected off, the and
modes do not appear in the MODE settings.
Rotate the F/CH control to toggle the setting on or off.
Side
Option
On or Off
This selects the sidetone on or off (Default is on).
Disabling the sidetone reduces power consumption by disabling the
headset amplifier during transmission. This is particularly useful
when the unit is used in gliders or other battery powered
installations. When Sidetone is selected off, no voice is heard
during transmission.
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Rotate the F/CH control to toggle the setting on or off.
nb
Option
On or Off
This selects the noise blanker on or off (Default is on).
The noise blanker provides additional noise filtering when the unit
is used in an electrically noisy environment such as a powered
aircraft. In battery only installations, such as in gliders, where
electrical noise is limited, addition power savings can be achieved
by disabling noise blanking.
Rotate the F/CH control to toggle the setting on or off.
hivolts
This setting determines the point at which the LOW BATT icon
begins to flash. The default value is 14.5 volts.
If the power supply raises above this value, the LOW BATT icon will
illuminate and flash.
Rotate the F/CH control to set the value.
lovolts This setting determines the point at which the LOW BATT icon
illuminates. The default value is 11.0 volts.
If the power supply reduces below this value, the LOW BATT icon
will illuminate.
Rotate the F/CH control to set the value.
Stuc
Option
10 to 90
Default 30
This setting determines the timeout period for a long transmission.
The default value is 30 seconds.
If the PTT is held for a period longer than this value, the unit will
automatically cease transmission. This feature reduces the effect
of a PTT switch or wiring failure by limiting the time that the unit
can transmit continuously.
Rotate the F/CH control to set the value.
Gain
Option
10 to 63
Default 50
This setting adjusts the microphone gain. The default value will be
set when the unit undergoes tuning prior to shipment and may
vary slightly from unit to unit.
This setting should only be modified by a suitably qualified
technician as transceiver performance will be affected.
Rotate the F/CH control to set the value.
Ptt2
Option This setting determines the mode of operation of the copilot PTT
switch. The default is on.

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On or Off
In a single place aircraft, in helicopters or in aircraft where only
one PTT switch is required, the copilot PTT can be used to toggle
active and standby frequencies, in the default screen, or to cycle
through memory channels, when in the MEM screen. When the
PTT2 setting is on, the copilot PTT is active and when this setting is
off, the copilot PTT acts as a toggle switch.
Rotate the F/CH control to toggle the setting On or OFF.
Input
Option
CD or Rad
This setting determines the mode of operation of the line input
audio. The default is CD.
The line input can be used as a second communication input or as
a music or compact disc input. When CD mode is selected, the
input volume will fade as the pilot or copilot talks and the input will
be muted as a signal is received on the radio. When Radio mode is
selected, this fade and mute feature is disabled.
Rotate the F/CH control to toggle the setting to CD or RAD.
AdjAct
Option
On or Off
This setting enables or disables the ability to adjust the active
frequency directly in the default screen. The default is off.
To enable quick scanning and selection of active frequencies, the
active frequency can be adjusted directly and the new frequency
monitored immediately. This is particularly useful when searching
for frequencies with activity. When this mode is enabled, in the
default screen, pressing the F/CH knob cycles adjustment of the
frequencies between the following:
•Standby MHz.
•Standby kHz. (Kkz. digit flashing)
•Active frequency (active frequency separator bar flashing)
•Active MHz. (active MHz. digit flashing)
•Active kHz. (active kHz. digit flashing)
After 3 seconds of inactivity, the unit will revert to modification of
the standby frequency.
Rotate the F/CH control to toggle the setting on or off.
Antenna Information
The XCOM 760 Transceiver is a state-of-the-art product and requires a quality,
matched antenna to provide the best possible performance, clarity and range.
Some of the most important considerations are the location of the antenna, proper
installation and high quality cable and connectors.

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The most suitable location for the antenna is generally on top of the aircraft in a
location which can provide the best unobstructed line-of-sight view of the
surrounding areas. The antenna should be positioned so as to provide the
maximum clearance from obstacles and other antennas on the aircraft to limit
reflection and cross talk interference. In particular, position the antenna as far as
reasonably possible from high power transmitter aerials, such as that of the
transponder.
To provide the best performance from your antenna, a suitable ground must be
established. Without an adequate ground, transmission patterns may be difficult to
predict and performance will be significantly reduced. On metal aircraft with
certain antennas it is necessary to remove the paint from the inner surface to
provide a good metal-to-metal contact with the aircraft’s skin. On composite
aircraft it is necessary to install a ground plane unless already installed by the
aircraft manufacturer or unless using a dipole antenna.
Where the antenna requires a ground plane, the ground plane should be at least
20” (500mm) diameter or larger. Best performance will be gained with a large
ground plane. In composite aircraft, it is generally possible to epoxy or RTV
(silicone) a thin piece of aluminum sheet inside the structure to provide an
adequate ground plane.
Ground plane independent antennas are suitable for use with the XCOM. However,
in our experience, a fully grounded antenna with a large ground plane provides
superior performance.
Antenna construction is also a factor in determining the best installation. Most VHF
antennas used on sport aircraft are ¼ wave whip type antennas made from either
metal or fiberglass. The cheaper wire whip antennas are prone to deformation and
bending in flight and this impacts the tuned characteristics, reducing performance
of the radio installation. The enclosed fiberglass antennas generally do not suffer
this shortfall.
As a result, many of the more expensive antennas provide far greater receive and
transmission ranges due to their broad bandwidth characteristics.
Most antennas sold today are pre-tuned to the middle of the aircraft frequency
communications band. Although they provide adequate performance, these
antennas are generally not optimum for every installation as the characteristics
mentioned above vary in every aircraft. We therefore recommended that a SWR
test be performed at 118.000 MHz. and 137.00 MHz. and the antenna tuned to try
and get the SWR reading as low as possible at both of these frequencies. An ideal
VSWR reading should be below 1.5:1 but any value up to 3:1 is still considered
acceptable.
Finally, try to keep the antenna cable as short as possible and keep it clear of other
interference producing wiring such as electrical cables, strobe supplies, other
antenna cables and the like. Never coil excess cable, always cut the antenna cable
to the shortest possible length.

Wiring Diagram – Typical Installation
910 +
Pins
Wire 18AWG
12
Wire 18AWG
Pilot Headphones
Copilot Headphones
14
13
Pilot Mic
Copilot Mic
PTT Button
PTT Button
6
3
7
1
Pilot PTT
Pilot Mic
CopilotPTT
Copilot Mic
Copilot Headphones
Pilot Headphones
+
-
15
4
Speaker
Music Input
2
Backlight
Intercom ON/Off
8
5
11
Ground
+13.8 V
1 2 3 4 5 6 7 8
9 10 11 12 13 14 15
DB15 FEMALE plug viewed
from the rear (wire) side
XCOM VHF760 TRANSCEIVER WIRING DIAGRAM
Version 3 - Issued August 2005 Copyright XCOM Avionics www.xcomavionics.com
3A Fuse must be installed
*WhenusingElectretorAmplifieldDynamicsyoumustuseindividualinputs(1and3).Donot
parallel more than one per input.
*Speakernowhasaseparatenegativelead-donotgroundthespeaker asdamagewillresultin
theradiospeakeramplifier!
*22,000uF 25VElectrolyticCapacitorMustBe Installed
Electret,Amplified Dynamic Pilot Mike
MusicAuxAudio Input
Electret,Amplified Dynamic Co Pilot Mike
SpeakerOutput 8-16 Ohms
Intercom ONground to operate
PTTCo Pilot
PTTPilot
Positive 12 Volts
Positive 12 Volts
LEDBacklight +12V
SpeakerOutput 8-16 Ohms
Pilot Isolate
Negative Ground
Headphone Output Co Pilot
Headphone Output Pilot
XCOM760 VHF Transceiver Pin Details
Pin 1
Pin 2
Pin 3
Pin 4
Pin 5
Pin 6
Pin 7
Pin 8
Pin 9
Pin 10
Pin 11
Pin 12
Pin 13
Pin 14
Pin 15
All wires 22 AWG except power and ground
Center off switch
ON
Isolate
16V Maximum
To panel dimmer
22,000 uF 25V
Electrolytic Capacitor
MustBeInstalled
Notes
Release 1.7 © XCOM Avionics 2005 www.xcom760.com Page 18

Release 1.7 © XCOM Avionics 2005 www.xcom760.com Page 19
XCOM VHF Transceiver Specifications - Subject to Change
•Approvals: FCC, FAA, Finland CAA
•Tested to TSO C37d and C38d, environmental DO-160D
•Receiver Class D
•Transmitter Class 4
•Note: transceiver was designed to these specifications and meets and
complies with these, but has not yet been submitted for official TSO testing
•118.000 to 136.975 MHz, 760 channels transmit and receive (AM) receiver
sensitivity AM (118 – 136.975 MHz.): not less than 12 db SINAD for 1.5 uv
(30% AM at 1 kHz. audio)
•160 to 163 MHz. NOAA weather channels receive
•137 to 163 MHz. general coverage receive, receiver sensitivity FM (137 – 163
MHz.): Not less than 12 db SINAD for 0.7uv (±3.3 kHz. deviation at 1 kHz.
audio) Typically 12dB SINAD @ 0.5uv
•108 to 117.975 VOR receive only audio (no nav) receiver sensitivity AM (108
– 117.975 MHz.): Not less than 12db SINAD for 2.0 uv (30% AM at 1 kHz.
audio)
•140 to 144.00 MHz. CAP capable (on request – subject to FCC approval)
•Quasi alphanumeric display - 2 line backlight LCD
•Backlighting - LCD display and keypads, external lighting control volts
•Memories - 99 user definable memories, non volatile (no battery required)
•Transmit power – 5.5 Watts (+ 1dB / - 0.5 dB) into 50 Ohms (5.9 watts
nominal). Approximately 2 watts emergency operation (10 volts input)
•Modulation – High level amplitude modulation with a maximum modulation
depth of 80%
•Transmit timeout 30 seconds default (user selectable)
•Microphones - Electret > 100mv into 200 ohm
•Intercom: 2 place voice activated (vox) with CD music input
•Auxiliary input for CD/MP3 music system max 1 volt p-p into 600 ohm
•Input voltage - 13.8 vdc (8 to 16 vdc receive, 10.0 volts transmit, reduced
output)
•Current consumption - < 140ma receive (muted) with no intercom. <2.5
amps transmit
•2.2 amps transmit nominal
•Voltage alert - low battery indication, user definable (default 10.5 vdc)
•Voltage alert - high battery indication, user definable (default 14.5 vdc)
•Operating Temperature range - -20 to +55 °C (emergency -40 to + 85 °C
with reduced performance)
•Speaker audio output - @ 13.8 Vdc: > 3 Watts rms into 8 Ohms @ 10% thd
•RS232 programming port for downloading memory channels and operating
parameters etc. from a PC. Also used for software upgrades
•Optional remote control module allows PTT operated frequency selection, dual
watch and memory channel operation.

Certification
800 Independence Ave, SW
U.S. Department Washington, DC 20591
of Transportation
Federal Aviation
Administration
JUL 0 8 2004
Mr. Andy Leimer
Federal Communications Commission Equipment
Authorization Branch 7435 Oakland Mills Road
Columbia, Maryland 21046
Dear Mr. Leimer:
The Federal Aviation Administration's ATC Spectrum Engineering Services, has reviewed the type
Acceptance Certification request from X-Air Australia for the XCOM 760VHF transceiver ID
number QLDXCOMVHF. The technical data for this equipment is consistent with the spectrum
requirements and we have no objections to certification of this device.
If you have any question, please contact Mr. Donald Nellis, Spectrum Planning and International
Office at [phone].
Sincerely,
George K. Sakai
Director, ATC Spectrum Engineering Services
Release 1.7 © XCOM Avionics 2005 www.xcom760.com Page 20