Thank you for purchasing a Futaba R7308SB
FASSTest-2.4GHz compatible receiver. TheR7308S B r e c e i v e r f e a t u r e s b i - d i r e c t i o n a lcommunication with a FASSTest Futaba transmitterusing the S.BUS2 port. Using the S.BUS2 port
an impressive array of telemetry sensors may beutilized. It also includes both standard PWM
output ports (1-8ch) and S.BUS output ports. The
R7308SB can also be switched to the Dual Rx
Link System. This system can ensure safety bymounting two FASSTest receivers on one aircraft.

1M23N38310

R7308SB◆ FASSTest-2.4GHz Bidirectional Communication System◆ Dual Rx Link System Equipment◆ S.BUS2 / S.BUS Port and 8 Channels for Conventional SystemReceiver● Applicable systems: Futaba FASSTest-2.4GHz system transmitter

Usage precaution

Antenna installation for carbon fuselage• Analog servos cannot be used with the R7308SB in the FASSTest
12CH mode.

• Don't connect to Extra Voltage before turning on a receiver.

You must leave 30mm at the tip of the antenna fully exposed. The
exposed antenna should be secured so that it cannot move around orback inside of your aircraft.

WARNINGBe careful of connector insertion
Don't connect an S.BUS servo / gyro to S.BUS2 connector.

Changes or modification not approved by the party responsible forcompliance could void the userʼs authority to operate the equipment.

Link precaution

The R7308SB receiver should be protected from vibration by foamrubber, Velcro, or similar mounting methods. Protect from moisture.

Do not perform the linking procedure while the motor's main power isconnected or the engine is operating as it may result in serious injury.

Keep away from conductive materials to avoid short circuits.

When the linking is complete, please cycle the receiver power andensure the receiver is properly linked to the transmitter.

Antenna installation precaution

Power on the system in this order: Transmitter ﬁrst, followed by thereceiver.

Do not cut or bundle the receiver antenna wire.
The antennas must be mounted in such a way to assure they are strain
relieved.

If the R7308SB receiver was previously linked to another transmitter,
make sure that transmitter is not operating while linking the receiver tothe new transmitter.

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

Connector precaution

Do not touch the antenna to metal, carbon, or other conductive
material.

Don't connect a connector, as shown inthis ﬁgure.
■ It will short-circuit, if it connected in this way.
A short circuit across the battery terminals may
cause abnormal heating, ﬁre and burns.

Be sure that the two antennas are placed at 90 degrees to each other.
■ The R7308SB 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.

Do not insert either a switch
or battery in this manner.

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(Typical installation)

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The R7308SB has a port switching
function. If SB2/4 to SB2/7 ports are also
set to S.BUS2, sensors can be connected.

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R7308SB

0RGHVZLWFK,WLVQRWXVHGIRUDOLQNFASSTest-2.4 GHz system(18 ch/12 ch mode)
S.BUS2 and S.BUS port and 8 channels for conventional system receiver• Dual antenna diversity • Sleeve antenna• Size: 0.98 x 1.53 x 0.56 in. (24.9 x 38.8 x 14.3 mm)• Weight: 0.39 oz. (11.0 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: 0 〜 70 V DC

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R7308SB Speciﬁcations+8%*Be sure that when using ESCs regulated
output the capacity of the ESC must meetyour usage condition.
*Never use dry batteries for the power supply of the R7308SB as they may cause
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LED Indication
StatusNo signal reception
Receiving signals
Waiting for link
Unrecoverable error (EEPROM, etc.)

Do not bend the antenna partRed Solid
Green Solid
Start → 2second
later → Red Blink（3 second）
Red Green
Alternate blink

In Dual RX Link Mode
StatusExternal receiver is receiving error or not connected.
S.BUS signal not received
S.BUS signal reception from external receiver(also received by external receiver)

Gently bend the coaxial
cable part.

Antenna installation

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MODE LED

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Green Solid

In FASSTest12CH Telemetry OFF ModeStatus
LINK LEDStart

Fix the sleeve to the model

LINK LED

Orange Solid

Link
FASSTest is a bidirectional communication system
between the R7308SB receiver and FASSTest capabletransmitters. Multiple optional telemetry sensors may beconnected to the S.BUS2 on the receiver and that data is inturn displayed on the transmitter.

Link to the transmitter1 Bring the transmitter and the receiver close to eachother, within 20 inches (half meter).
2 Turn on the transmitter. Place the transmitter into
the receiver linking mode.
3 Turn on the receiver.
4 The receiver will wait for the linking process tobegin for 2 seconds. Following that it will return tothe normal operation mode.

Channel Modes
The R7308SB is capable of changing its channel allocations
as described in the table below. This is especially importantwhen using the receiver in a dual receiver mode. Seeyour transmitter operation manual for complete details on
operating in the dual receiver mode.
R7308SB CH Mode table
Outputconnector

ChannelMode A
CH 1-8Mode B
CH 1-7

Mode CCH 1-6

Mode DCH 1-3Mode E
CH 9-16

Mode FCH 9-15

Mode GCH 9-14111119992

222

2

10101033333111111

SB2 / 4444S.BUS2

121212SB2 / 5555S.BUS2131313

SB2 / 666

6S.BUS2141414

SB2 / 7

77S.BUS2S.BUS2

1515

S.BUS2SB / 88S.BUS

S.BUS

S.BUS

16S.BUS

S.BUS

LEDblink

RED 1RED 2RED 3RED 4RED 5GREEN 1 GREEN 2Default

5 When the LED of the receiver changes fromblinking red to solid green, linking is complete.
(A link waiting state is ended in 3 second.)• Refer to the transmitter's operation manual for complete
details on how to place the transmitter into the linking
mode.
• If there are many FASSTest systems turned on in close
proximity, your receiver might have difﬁculty establishing alink to your transmitter. This is a rare occurrence. However,should another FASSTest transmitter/receiver be linking
at the same time, your receiver could link to the wrong
transmitter. This is very dangerous if not noticed. To avoid
the problem, we strongly recommend that you double
check whether your receiver is really under control by yourtransmitter.
• If the System Type of the transmitter is changed, thereceiver will need to be re-linked to the transmitter.

S.BUS2

1 Turn on the receiver. [Transmitter is always OFF]2 Press and hold the SW for 5 seconds to 10 seconds.
3 When the LED of the receiver changes from blinking
red to blinking orange, SW is released.

4 The LED should now blink red two times in thepatterns described in the chart below.
5 Each press of the SW advances the receiver to thenext mode.

6 When you reach the mode that you wish to operatein, press and hold the SW for more than 2 seconds.
When LED blinks in orange, it is the completion of amode change, SW is released.

7 Cycle the receiver power off and back on again after
changing the Channel mode.

S.BUS2 extends S.BUS and supports bidirectional
communication. Sensors are connected to the S.BUS2 port.
LINK LED
Compliance Information Statement (for Canada)This device complies with Industry Canada license-exempt RSS standard(s). Operation is subject to thefollowing two conditions: (1) this device may not cause interference, and (2) this device must accept any
interference, including interference that may cause undesired operation of the device. This equipment complies with IC radiation exposure limits set forth for an uncontrolled environment. This equipment should beinstalled and operated with minimum distance 20cm between the radiator & your body.
French: Cet appareil radio est conforme au CNR-210 d’Industrie Canada. L’utilisation de ce dispositifest
autorisée seulement aux deux conditions suivantes : (1) il ne doit pas produire de brouillage, et (2) l’utilisateur
du dispositif doit être prêt à accepter tout brouillage radioélectrique reçu, même sice brouillage est susceptible de compromettre le fonctionnement du dispositif. Cet équipement est conforme aux limites d’exposition
aux rayonnements IC établies pour un environnement non contrôlé.
Cet équipement est conforme aux limites d’exposition aux rayonnements IC établies pour un environnement
non contrôlé. Cet équipement doit être installé et utilisé avec un minimum de 20 cm de distance entre lasource de rayonnement et votre corps.

1 Turn on the receiver. [Transmitter isalways OFF]2 Receiver enters link waiting state

Red Solid
Start → 2second
later → Red Blink（3 second）

3 The LED will ﬂash for the current CH Current CH mode
output mode.

displayDual Rx Link System

How to change to Dual RX Link mode

By installing two receivers in one aircraft, if one receiver
becomes unable to communicate, the other receiver can beoperated.

1 Turn on the receiver. [Transmitter is always OFF]2 Press and hold the SW for 5 seconds or more.

Receiver : AReceiver : B
Communicate with two receivers

Blinking switches every 5 seconds as follows.

RED ⇒ ORANGE ⇒ GREEN ⇒ ORANGE slow blink
If it is passed,
turn off the3 Release thepower andswitch hererestartBlinks GREEN once
Even if there is a problem with
the B receiver, communication
will be performed with the Areceiver.

Dual RX Link mode: OFFPress SW once
more to return toﬂashing green once

4 Press switch
Even if there is a problem withthe A receiver, communication
will be performed with the B
receiver.

Blinks GREEN twice

Dual RX Link mode: ONIn Dual RX link mode, the SB2/RX port is for reception
only, so use CH mode B, C, D, F, G mode for S.BUS
output and S.BUS2 input/output.

Connection example

5 Press and hold the SW
Blinks ORANGE

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6 Release SW)$667HVW5HFHLYHU
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Solid ORANGE(6&:KHQXVLQJ(6&Declaration of Conformity (for EU)

Hereby, Futaba Corporation declares that the radio equipment type is R7308SB in compliance with Directive
2014/53/EU. The full text of the EU declaration of conformity is available at the following internet address:

7 Turn off the receiver power
After restarting, theMODE LED lights up.

https://www.rc.futaba.co.jp/support/manual/
低功率射頻器材技術規範警語
取得審驗證明之低功率射頻器材，非經核准，公司、商號或使用者均不得擅自變更頻率、加大功率或變更原設計之特性及功能。
低功率射頻器材之使用不得影響飛航安全及干擾合法通信 ；經發現有干擾現象時，應立即停用，並改善至無干擾時方得繼續使用。前述合法通信，指依電信管理法規定作業之無線電通信。低功率射頻器材須忍受合法通信或工業、科學及醫療用電波輻射性電機設備之干擾。

StatusExternal receiver is receiving error or not connected.
S.BUS signal not received
S.BUS signal reception from external receiver(also received by external receiver)

MODE LEDRed Solid
Green SolidFASSTest12CH(Telemetry OFF）mode

How to Dual Rx Link

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collision of telemetry signals from the receiver to the transmitter
when using dual RX link mode in FASSTest12ch mode.
1 Turn on the receiver. [Transmitter is always OFF]2 Press and hold the SW for 5 seconds or more.

1 Install two receivers on the aircraft as shown in theconnection example.

2 Link the two receivers using the dual receiver featureof the transmitter.
For systems without dual receiver capability, linkeach receiver in turn.

Transmitter in link mode
For FASSTest 18CH Select dual mode and link primary*Follow the link procedure
for each receiver manual.

Blinking switches every 5 seconds as follows.

RED ⇒ ORANGE ⇒ GREEN ⇒ ORANGE slow blink

Turn on the main
receiver and link

3 Release theTransmitter in link modeswitch here

For FASSTest 18CH Select dual
mode and link secondary

Blinks ORANGE once

FASSTest12CH(TelemetryOFF）mode : OFFTurn on the subreceiver and link

Press SW once moreto return to ﬂashingorange once

◆ About telemetry system

4 Press switch

FASSTest12CH(TelemetryOFF）mode : ON

When using the dual receiver function

Blinks ORANGE twice

・The telemetry function of the main receiver can be used
・Sub-receiver telemetry function is not available

Telemetry for FASSTest12CH
In FASSTest12CH mode, after linking R7308SB in telemetry
OFF mode, link the receiver you want telemetry to. (Thetransmitter will show the telemetry of the last linked transmitter.)＃1

5 Press and hold the SW
Blinks ORANGEFirst LinkTelemetry OFFmode＃2＃2Display

Second Link

＃1First Link

Change to thismode when using
FASSTest12CH in
dual RX link mode.

6 Release SW＃2Second Link

Solid ORANGE

7 Turn off the receiver power
After restarting, theLINK LED lights up.
In FASSTest12CH Telemetry OFF ModeStatus
LINK LEDStart

Orange Solid

Telemetry

Telemetry OFFmodee.g.

FASSTest receiver＃2

Display
Telemetry＃2 Telemetry display of second-linked receiver.
＃1 Telemetry OFF ﬁrst-Linked receiver.
Compliance Information Statement (for U.S.A.)
This device, trade name Futaba Corporation, model number R7308SB, complies with part15 of the FCC
Rules. Operation is subject to the following two conditions:(1) This device may not cause harmful interference, and(2) This device must accept any interference received, including interference that may cause undesired operation.
CAUTION: To assure continued FCC compliance
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authority to operate the equipment.
2. This equipment complies with FCC radiation exposure limits set forth for an uncontrolled environment.
This equipment should be installed and operated with minimum distance 20cm between the radiator & your body.
The responsible party of this device compliance is:
FUTABA Corporation of America 2681 Wall Triana Hwy Huntsville, AL 35824, U.S.A.
Phone:1-256-461-9399 FAX:1-256-461-1059 E-mail: service@futabaUSA.com

FUTABA CORPORATION
Hobby Radio Control Business Center Sales & Marketing Department
1080 Yabutsuka, Chosei-mura, Chosei-gun, Chiba-ken, 299-4395, Japan TEL: +81-475-32-6051, FAX: +81-475-32-2915 ©FUTABA CORPORATION

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