7
Receiver/Servo Connections
and Installation
Your R-122 Receiver is equipped with Battery Eliminator
Circuitry (B.E.C.). The receiver gets its power from the
model’s Ni-Cad battery pack, thus saving the weight of an
additional receiver battery. Ni-Cad batteries from 4.8–8.4V
(4–7 cells) can be used safely. Higher voltage packs may
damage the receiver and servos.
Note: When using a separate receiver Ni-Cad as a power
source, the operating voltage range is 4.8–6.0V
(4–5 cell)
Attention: Make sure the male and female connectors have
the correct polarity (+/–) before connecting. The servo lead
and receiver case are molded so that the lead can only be
inserted correctly. Be sure to orient the servo plug correctly
for proper insertion.
You may use a separate gas to power the receiver (such as
for some electric boats or in gas-powered vehicles). A Ni-
Cad pack plugged into the BATT socket on your receiver will
operate your receiver. You may also use alkaline batteries
with the included battery box.
If you use a mechanical speed controller, please make sure
that it has the correct connector for a B.E.C. system (red con-
nector). See Figure A below for a typical set- up.
Most electronic speed controllers are set up for B.E.C. oper-
ation and plug directly into your receiver (Function 2). See
Figure B for a typical set-up and check your speed
controller’s manual for correct installation.
Figure A – Connections to B.E.C. receiver with mechanical speed
controller. Ni-Cad battery and speed controller are not included in the
radio set.
Figure B – Connections to B.E.C. receiver with
electronic speed controller. Ni-Cad battery and
speed controller are not included in the radio set.
To Resistors
Mechanical
Speed Control
BEC Connector
Switch
R-122 Receiver
R-122
Z250 Servos
To Motor
Battery Box
(For use with optional
separate receiver battery
power)
7.2V-8.4V Battery
7.2–8.4V Battery
R122 Receiver
R122
Z250 Servo
BEC Connector
E.S.C.
To Motor
JR XR-2 7/15/99 8:35 AM Page 7
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