1. With the model resting on the ground, stand 30 paces (approx. 90 feet)
away from the model.
2. Face the model with the transmitter in your normal flying position and depress and hold
the bind button on the back of the transmitter. This causes reduced power output from
the transmitter.
3. You should have total control of the model with the button depressed at 30 paces
(90 feet).
4. If control issues exist, call Horizon Product Support at 1-877-504-0233 for
further assistance.
Advanced Range Testing Using a Flight Log
While the above Standard Range Testing procedure is recommended for most sport aircraft,
for sophisticated aircraft that contain significant amounts of conductive/reflective materials
(e.g., turbine-powered jets, some types of scale aircraft, aircraft with carbon fuselages, etc.)
the following advanced range check will confirm that all internal and remote receivers are
operating optimally and that the installation (position of the receivers) is optimized for the
specific aircraft. This Advanced Range Check allows the RF performance of each individual
internal and remote receiver to be evaluated and to optimize the locations of each individual
remote receiver.
Advanced Range Testing
1. Plug a Flight Log (JRPA145, optional) into the data port in the R921X receiver and
turn on the system (transmitter and receiver).
2. Advance the Flight Log until F- frame losses are displayed, by pressing the button
on the flight log.
3. Have a helper hold your aircraft while he observes the Flight Log data.
4. Standing 30 paces away from the model, face the model with the transmitter in your
normal flying position and depress and hold the bind button on the back of the
transmitter. This causes reduced power output from the transmitter.
5. Have your helper position the model in various orientations (nose up, nose down,
nose toward the transmitter, nose away from the transmitter, etc.) while your helper
is watching the Flight Log, noting any correlation between the aircraft’s orientation and
Frame Losses. Do this for 1 minute. The timer on the X9303 can be used here. For giant-
scale aircraft, it’s recommended that the airplane be tipped up on its nose and rotated
360 degrees for one minute, then record the data. Next place the airplane on its wheels
and do a second test, rotating the aircraft in all directions for one minute.
6. After one minute, release the bind button. A successful range check will have recorded
zero frame loses. Scrolling the Flight Log through the Antenna fades (A, B, L, R) allows
you to evaluate the performance of each receiver. Antenna fades should be relatively
uniform. If a specific antenna is experiencing a high degree of fades, then that
antenna should be moved to a different location.
7. A successful Advanced test will yield the following:
H- 0 holds
F- 0 frame losses
A, B, R, L- Antenna fades will typically be less than 100. It’s important to compare the
relative antenna fades and if a particular receiver has significantly higher antenna fades
(2 to 3X), then the test should be redone, and if the same results occur, move the
offending receiver to a different location.
