environment, and this is the key to maintaining a solid RF link, even in aircraft that have
substantial conductive materials (e.g., turbine engines with metal tail pipes, carbon fiber,
tuned pipes, etc.) which can weaken the signal.
Using double-sided foam tape (servo tape), mount the remote receiver(s), keeping the
remote antenna(s) at least 2 inches away from the primary antenna. Ideally, the antennas
will be oriented perpendicular to each other; however, we’ve found this to not be critical.
6-inch, 9-inch, 12-inch, 24-inch and 36-inch leads are available and, in sophisticated
aircraft, we’ve found it best to mount the remote receivers in different parts of the aircraft,
keeping the remote antennas as far away as practical from any conductive materials. A
typical installation would include the main receiver mounted in the conventional location in
the fuselage and the remote antennas in the nose (jets) in the top turtle deck and even in
the tail. The optimum location is as far away from any conductive materials as practical.
In helicopters, there is generally enough room on the servo tray to achieve the necessary
separation. If space is limited, a mount can be made using clear plastic to mount the
external antenna.
R921X Binding Instructions
The R921X receiver must be bound to the transmitter before it will operate. Binding is the
process of teaching the receiver the specific code of the transmitter or transmitter module
so it will connect only to that specific transmitter. Once bound, the receiver will only connect
to that specific transmitter (module) or when used with a Spektrum
™
or JR
®
transmitter that
has ModelMatch
™
, the receiver will only connect when the previously bound model memory
is selected. If another model memory is selected, the receiver will not connect. This feature
is called ModelMatch and prevents flying a model using the wrong model memory.
QuickConnect
™
In the event of a power interruption, the receiver will reconnect with the transmitter
immediately when power is restored. This feature helps avoid control loss during short
interruptions in power.
Note
: The R921X receiver features DSM
®
technology and is compatible with all JR
®
and Spektrum
™
aircraft radios that support DSM2 and DSMX technology including:
JR12X, 12X MV, 11X, X9503, X9303, JR DX8, DX7, DX6i, DX5e and Module Systems.
