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Applicable systems: Futaba FASSTest-2.4 GHz system 

transmitter 

If R7103SB does not use S.BUS/S.BUS2 system, it can 
perform only operation of 3 channels. However, if S.BUS/
S.BUS2 system is used, use of the maximum channel of 
a transmitter can be performed. You have to use S.BUS/
S.BUS2 servo, in order to use S.BUS/S.BUS2 system.

R7103SB

FASSTest-2.4 GHz Bidirectional Communication System
S.BUS2 / S.BUS Port and Conventional System Receiver

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FASSTest-2.4 GHz 

system/

S.BUS2 

and

 S.BUS

 port and conventional system receiver

• Dual antenna diversity
• Size: 0.89 x 1.47 x 0.37 in. (22.5 x 37.4 x 9.3 mm)
• Weight: 0.29 oz. (8.3 g)
• Power requirement: 3.7 V to 7.4 V (Voltage range: 3.5 V to 8.4 V)
• Battery F/S Voltage: It sets up with a transmitter
• Extra Voltage port (port 2) "EXT-VOL cable and CA-RVIN-700" of an option is used: 0 to 70 V DC

* Be sure that when using ESCs regulated output the capacity of the ESC must meet your usage condition.

Thank you for purchasing a Futaba 

R7103SB FASSTest-2.4 GHz

compatible receiver. The 

R7103SB

 receiver features bi-directional 

communication with a 

FASSTest

 Futaba transmitter using the 

S.BUS2

port. Using the 

S.BUS2

 port an impressive array of 

telemetry sensors

may be utilized. 

R7103SB

 has a merit which acquires the information 

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telemetry sensors

. It 

also includes both standard PWM output ports and 

S.BUS

 output ports. 

ports

 of 

R7103SB

 can choose an output channel from the 

11 modes

LED Indication

Green

Red

Status

Off

Solid

No signal reception

Solid

Off

Receiving signals

Alternate blink

Unrecoverable error (EEPROM, etc.)

FASSTest

FASSTest

 is a bidirectional communication system between the R7103SB 

receiver and FASSTest capable transmitters.  Multiple optional telemetry sensors 
may be connected to the 

S.BUS2

 on the receiver and that data is in turn displayed 

on the transmitter.

*Please see your transmitters operation manual to configure transmitter to operate 

with telemetry sensors.

Please refer the table below for LED status vs 

receiver's condition.

1M23N35802

Usage precaution

• Analog servos cannot be used with the R7103SB in the FASSTest 12CH mode.

• The R7103SB receiver can only be used with FASSTest capable transmitters.

WARNING

Changes or modification not expressly approved by the party responsible 

for compliance could void the user’s authority to operate the equipment.

The R7103SB receiver should be protected from vibration by foam rubber, 

Velcro or similar mounting methods. Protect from moisture.

Keep away from conductive materials to avoid short circuits. 

Don't connect the servo or gyro which do not correspond to S.BUS2 port 
S.BUS2.

• When the servo and gyro which do not correspond to S.BUS2 are connected to S.BUS2 

port, there is a danger of falling by malfunction. 

Turn on the power in transmitter

receiver order. In addition, always check 

the operation of all the servos before flight.

Do not insert or remove the servo connector while the receiver power is 
ON.

•Since the S.BUS servo switches the operation mode automatically according to the 

type of signal (S.BUS signal/PWM signal) from the receiver, if the connector is inserted 
or removed while the power is ON, an S.BUS connected servo will be erroneously 
recognized and may stop.

Antenna installation precaution

Do not cut or bundle the receiver antenna wire.  

     

Do not bend the coaxial cable. It causes damage.

The antennas must be mounted in such a way to assure they are strain    
relieved.

Keep the antenna as far away from the motor, ESC and other noise sources 
as you possibly can.

Be sure that the two antennas are placed at 90 degrees to each other.

• The R7103SB has two antennas. In order to maximize signal reception and promote 

safe modeling Futaba has adopted a diversity antenna system. This allows the receiver to 
obtain RF signals on both antennas and fly problem-free.

Antenna installation for carbon fuselage

WARNING

You must leave 30 mm at the tip of the antenna fully exposed. The exposed 

antenna should be secured so that it cannot move around or back inside of 
your aircraft. 

(Typical installation)

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Mode

Port

Port1

Port2

3/B

S.BUS2

A(Default)

S.BUS

CH2

CH3

S.BUS2

90°

Do not bend the antenna part

Gently bend the coaxial 

cable part.

Fix the sleeve to the model

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Antenna installation

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