Release 1.7
© XCOM Avionics 2005
www.xcom760.com Page
10
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.
