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Receiver with BEC system
The SB6 SYN receiver features a high-quality voltage stabilisation system (BEC = Battery Eliminator Circuit). This
draws the required power for the receiver and the servos connected to it from the model’s main drive battery.
Important note:
The BEC system has limited current capacity:
With a 4.8 ... 6 V drive battery (4 ...5 NiCd or NiMH cells):
maximum 1 Amp
With a 7.2 V drive battery (6 NiCd or NiMH cells): maximum 0.7 Amp
This corresponds approximately to the load represented by two standard servos, e.g. C507, C508, C512 or C577.
If you wish to use more powerful servos drawing higher currents, the BEC system must not be used, as
overloading will immediately wreck the receiver and the servos connected to it.
If powerful servos are installed in your model, e.g. two high-performance digital servos, the BEC system must
be by-passed by plugging a receiver battery into any servo socket (1 - 3). In this case the battery socket is
simply left unused.
Wiring diagram 1: Mechanical speed controller with BEC connector
Most electric cars with a mechanical speed controller are fitted with a BEC cable as standard. This takes the form of
a separate 2-core BEC cable with a red connector, attached permanently to the mechanical speed controller. This
connector can be plugged directly into the battery socket on the receiver (see sketch below).
Caution:
The SB6 SYN receiver is designed to be used only with batteries up to 7.2 V (6 NiCd or NiMH cells). If the
car is fitted with a higher voltage drive battery, the 2-pin BEC connector must not be connected to the
receiver. In such cases a separate receiver battery (see wiring diagram 3) must be used.
Receiving system
BEC system, typical wiring arrangements
Receiver
Select desired frequency channel (Ch
50 - 92) using a small screwdriver
If the receiving system is not to be
powered from the drive battery, the
battery holder supplied with the RC set
can be used.
Mechanical
speed controller
Drive battery
4.8 ... 7.2 V
to motor
ON/OFF switch
