XP8103 18
The XP8103 employs a plug-in module system for transmitter
frequency changes. If you want to change a frequency, you can
simply change the radio frequency (RF) module, commonly
referred to as either an RF module or transmitter module. The JR
modules are universal for all modular frequency controlled
systems. In other words, if you currently own a modular JR
system, you can use the RF module from your current system with
the XP8103.
The XP8103 can transmit in either Pulse Code Modulation (PCM)
or in Pulse Position Modulation (PPM, commonly referred to as
FM). Be certain to observe the following guidelines:
1. Do not operate your transmitter when another transmitter is
using the same frequency, regardless of whether the second
transmitter is PCM, PPM (FM) or AM. You can never operate
two transmitters on the same frequency simultaneously without
causing interference to both receivers and crashing both aircraft.
2. For operation of your XP8103 with additional receivers, you
should refer to the receiver compatibility chart. The chart is
located in the Modulation Select Section of this manual.
(pg. 31)
Aircraft Only Frequencies
JR RF modules and receivers are available on 50, 53, and 72
MHz frequencies in the United States for use with model aircraft.
Employing 72 MHz frequencies does not require a special
operators license from the Federal Communications Commission
(FCC). However, the 50 and 53 MHz frequencies require that
you carry a Technician II license.
• A chart for all available frequencies is located on page 142
of this manual.
5.7 Frequency Notes/Aircraft Only Frequencies
5.8 Lithium Battery Indicator/Backup Error Display
Lithium Battery Indicator
If the voltage level of the lithium battery drops below an
acceptable level (2.2v), an “L” will appear and flash to the left
of the model number. This indicates that the lithium battery will
no longer maintain program memory if the main battery is
disconnected. When the flashing “L” appears on the screen, the
system should be sent to the JR/Horizon Service Center for a
lithium battery replacement.
Alarm and Backup Error Display
All pre-programmed data is protected by a five-year lithium
battery that guards against main transmitter battery failure.
Should the lithium battery fail, the display will indicate 1 back
up error regardless of the position of the ON/OFF switch. If
this occurs, it will be necessary to replace the battery and
reprogram all data. All transmitter programs will return to the
factory default setting, and the data you have input will be lost.
When it becomes necessary to replace the lithium back-up
battery, contact the JR/Horizon Service Center. Due to the
possibility of extensive damage caused by improper removal or
replacement, only the JR/Horizon Service Center is authorized
to make the change.
JR/Horizon Service Center
4105 Fieldstone Road
Champaign, IL 61821
"L" indicates
lithium battery
needs to be
replaced
