REDCAT R3C 4 Channel Radio User Manual

MAN-R3C-2024-3-13
User Manual
FOR SCALE CRAWLERS ONLY Radio & RX/ESC

INCLUDED

R3C: 2.4GHz Transmitter – 4CH
R3C-ER: 2-in-1 ESC/Receiver – 3CH

REQUIRED

Transmitter Batteries: Four AA batteries
LIPO Battery: 7.4V 750MAh w/ male JST plug

IMPORTANT LINKS:

• To view the full length manual with ESC guide, Radio guide, exploded views and parts lists, go to: www.redcatracing.com/pages/manuals
• Link to electric vehicles manual: www.redcatracing.com/manuals/ELECTRIC-MANUAL.pdf

R3C Radio/ESC Guide

Warnings & Compliance

** FCC Compliance Statement! The radio included with your vehicle complies with part 15 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 operations.
Note:** This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules.
These limits are designed to provide reasonable protection against harmful interference i a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one of the following measures:

• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and receiver.
• Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
• Consult the dealer or an experienced radio/TV technician for help.

TX
FCC ID: 2A2UNRTX4C00
IC:24025-RTX4C00
This device complies with Industry Canada license-exempt RSS standard(s). Operation is subject to the following two conditions: (1) This device may not cause interference, and (2) this device must accept any interference, including interference that may cause undesired operations of this device.
WARNING: Any changes or modifications not expressly approved by the party responsible for compliance could void the user’s authority to operate this equipment.
WARNING: While operating the Radio, a separation distance of at least 20 centimeters must be maintained between the radiating antenna and the body of the user or nearby persons in order to meet the FCC RF exposure guidelines.
AFHDS (automatic frequency hopping digital system)
AFHDS was developed for Radio control models and offers active and passive anti-jamming capabilities, low power consumption and high receiver sensitivity.
This radio system works in the frequency range of 2.405 to 2.475GHz. This band has been divided into 141independent channels. Each radio system uses 16 different channels and 142 different types of hopping algorithm. By using various switch-on times,  hopping scheme, and channel frequencies, the system s less likely to lose transmission.
Each transmitter has a unique ID. When binding with a receiver, the receiver saves that unique ID and can accept only data from that unique transitter.
This avoids picking another transmitter signal and dramatically increases interference immunity and safety.
WARNING: Even with the AFHDS 2A-BS technology, if the radio system is not used in accordance with this manual, it can still fail and cause serious injury. Be sure to read and understand this entire manual, as well as the manual that came with all other RC components you are Using.

Specifications

TRANSMITTER SPECS.

Number of Channels| 4
Use| Surface use only
RF| 2.4GHz ISM
Maximum Power| <20dBm (e.i.r.p.) ( EU)
2.4GHz Protocol| 2A-BS
Distance| >300m (Ground Distance w/o Interference)
Channel Resolution| 1024
Input Power| (4x)1.5AA batteries
Low Voltage Alarm| <4.2V
Antenna| Built-in
Temperature Range| -10deg. Celsius ~ +60deg. Celsius
Humidity Range| 20% ~ 95%
Dimensions| 160x193x97mm
Weight| 220g
Certifications| CE, FCC ID: N4ZG4P00
ESC/RECEIVER SPECS.

Number of Channels| 3
Compatible Models| 1:18 Crawler
RF| 2.4GHz ISM
2.4GHz Protocol| 2A-BS
Distance| ≥300m (Ground Distance w/o Interference)
Input Power| 2S LiPo
BEC Output| 5V/1 A
Data Interface| PWM
Cont. / Peak Current| 10A/40A
Applicable Motors| 180 Brushed Motor
Temperature Range| -10deg. Celsius ~ +60deg. Celsius
Humidity Range| 20% ~ 95%
Weight| 9.8g
Dimensions| 382513mm
Dimensions| 382513mm
Certifications| CE, FCC ID: 2A2UNR3A00

R3C Radio Guide

Transmitter Overview

from center to full left or to full right
[16] Throttle Trigger| The total moving angle of the throttle trigger is 3755 Degrees; 25 Degrees forward and 12.5 Degrees backward

Transmitter Batteries
Insert 4 brand new AA batteries into the controller. Be sure to line up the positive (+) side of the battery with the (+) mark inside the battery compartment.
WARNING: Never mix and match different battery types and never mix old and new batteries. Only use 4 new AA Alkaline batteries.

Receiver/ESC Overview

(Aux. Servo)
[3] LED| [8] S (Channel Interface Signal Pin)
[4] Antenna| [9] + (Channel Interface Anode Pin)
[5] Power Button| [10] – (Channel Interface Cathode Pin)

LED
The LED [3] indicates the working state of the receiver/ESC.
OFF: The receiver is not powered on.
ON – Solid: The receiver is on and working normally.
Flashing Quickly: The receiver is in binding mode.
Flashing Slowly: The transmitter is powered off, or the receiver isn’t receiving a signal from the transmitter.
Interface
CH1 and CH3 channel interfaces [6] & [7] are standard 2.54mm*3 Pin connectors, which are found on most common servos.
The battery interface [1] uses a female JST connector. The battery pack must have a male JST connector.
The motor interface [2] includes a female PH2.0 connector that is built into the receiver/ESC.
The included extension uses a male PH2.0 connector on one end and two blade connectors on the other end that connect to the positive and negative terminals found on the motor.
External Antenna
CAUTION: Do not pull on or bend the receiver’s antenna. Do not fasten the antenna and the servo cable together.
CAUTION: Keep the receiver’s antenna at least Icom away from conductive materials such as carbon or metal. If the antenna is too close to conductive materials, it will negatively effect the signal strength of the receiver.

Receiver/ESC Connections

Attention: Be sure the plug ends are correctly oriented and plugged in fully. Attention: The ESC only accepts a 2S LIPO battery.
Only use a 2S LIPO battery.

Receiver/ESC Connections – Side View

Attention!
Be sure all connections are plugged in correctly. Be sure all connectors are securely plugged in all the way.
The ESC and the receiver are both housed into a single unit so there is no need to plug in an external ESC.
There are two 2.54mm 3 pin standard outlets (CH1 & CH3). These outlets are for plugging in a steering servo (CHI) and an optional auxiliary servo (CH3). Do not attempt to plug an ESC into either of these outlets. The ESC is already built into the receiver and no external ESC is needed. See the above illustrations for proper connections.
Pay attention to the following when installing the receiver:

1. Make sure the receiver is not installed near a motor or other sources of electrical noise.
2. Keep the receiver’s antenna away from conductive materials such as carbon or metal. To ensure normal function, make sure there is a gap of at least Icom between the antenna and the conductive material.

Powering ON
Be sure the battery is fully charged and installed correctly (see above).
Follow the steps below to turn on the transmitter:

1. Toggle the Power Switch of the transmitter to the ON position. The R.LED will illuminate.
2. Push the power button to power on the receiver.

Note: For safety, always power on the transmitter before the receiver.

1. Turn on the transmitter 1st.
2. Then, turn on the receiver/ESC.

Binding

The transmitter and receiver have already been bound at the factory. However if the receiver needs to be replaced or additional receivers bound follow these steps:

1. Turn on the transmitter while pressing and holding the BIND button, then the transmitter will enter the binding mode. At this time, the G.LED will start flashing quickly. Once in binding mode release the Bind button.
2. The receiver will enter the binding mode automatically when powered on.
3. Once binding is successful, the LED of the receiver will flash slowly, and the transmitter LED will remain solid on after being re-powered on.

Note: When binding, put the transmitter into binding mode first, then the receiver.

Calibration

Use this function to correct for the mechanical deviation of the throttle trigger and steering wheel, for example, deviation occurred in the self- centering or maximum minimum travel, the steps are as following:

1. Turn and hold the steering wheel clockwise to the max travel and push the throttle trigger forwards as far as possible, and at the same time turn on the transmitter, the transmitter will be in calibration mode. The R.LED and G.LED will work in two-flashing-one-off state repeatedly.
2. Steering Wheel Calibration: Turn the steering wheel to the max and min travel clockwise/counterclockwise respectively. When calibration is completed, the R.LED will be off.
3. Throttle Trigger Calibration: Push/pull the throttle trigger to forward/backward as far as it will go. When calibration is completed, the G.LED will be off.
4. Once calibration is complete, press the BIND button to save and exit. The G.LED will be lit solid.

Powering OFF

1. Unplug the battery pack from the receiver and remove it from the vehicle.
2. Turn off the transmitter.

Note: Always be sure to disconnect the battery pack from the receiver BEFORE turning off the transmitter.

Channel Reverse

This function is used to adjust each channel’s direction of movement in relation to its input.
The ST.REV and TH.REV are the reverse switches for CHI (steering) and CH2 (throttle).
If the switch is up, it indicates the channel is in reverse, and if the switch is down, it indicates the channel is in its normal operating mode.
Example: If the vehicle moves forward while moving the throttle trigger to the reverse position, flip the TH.REV switch.

Steering & Throttle Trims

1. The ST-TRIM+ and ST-TRIM- are the trim buttons for centering CHI (steering), and can be multiplexed as trims of CH3 and CH4. For multiplexing switching mode, refer to PG.6 “Mode Switching”.
2. THATRIM+ and TH.TRIM- are the trim buttons for centering CH2 (throttle). Adjustment Range: -120us – + 120us, and the step is 4us.

If the vehicle steers to the left or right automatically with the steering wheel centered, use the appropriate steering trim button until the vehicle drives straight.If the vehicle drives forward or backward automatically with the throttle trigger centered, use the appropriate throttle trim button until the vehicle remains still.

LED status:

• When pressing the trim keys, the G.LED will flash slowly on short presses and quickly on long presses.
• When the trim adjustment value is at the neutral position, the G.LED will flash twice slowly.
• When the trim adjustment value is at it maximum or minimum setting, the G.LED will not flash at all.

Note: After the throttle trim is changed, the receiver needs to be re- powered on to recognize the new throttle neutral. Otherwise, an exception may occur during vehicle reversing.

Steering Dual Rate

ST.D/R+ and ST.D/R- are used for the CHI steering servo travel adjustment, which can be multiplexed as CH2 (throttle), CH3, and CH4 servo travel adjustment, refer to “Mode Switching” for multiplex switching mode; Adjustment Range: O-120%(the default is 100%), and the step is 5%.
ST.D/Rt: Increases servo travel. ST.D/R-: Decreases servo travel.Press the ST.D/R “+” button to increase maximum steering.
Press the ST.D/R “-” button to decrease maximum steering.

LED status:

• When using the D/R keys, the G.LED will flash slowly on short presses and quickly on long presses.
• When the travel adjustment value is at its end points (maximum/minimum values of 0/120%), the G.LED will not flash at all.

Mode Switching

This function is for reusing ST-TRIM(including ST.TRIM+ and ST-TRIM-) and ST.D/R (including ST.D/R+ and ST.D/R-) adjustment buttons for different channels. Refer to [Steering Trims] and [Steering Dual Rates.
Setup: While the receiver is ON, quickly press the BIND button twice (within 1 second) to cycle through modes 1, 2, 3, and 4. The default setting when powering on is mode 1.
Model 1: The GLED flashes slowly once. The ST-TRIM is used for CHI trim adjustments and the ST.D/R is used for CH1 end point adjustments.
Mode 2: The G.LED flashes twice slowly. The ST-TRIM is used for CHI trim adjustments and the ST.D/R is used for CH2 end point adjustments.
Mode 3: The GLED flashes three times slowly. The ST.TRIM is used for CH3 trim adjustments and the ST.D/R is used for CH3 end point adjustments.
Mode 4: The GLED flashes slowly four times. The ST-TRIM is used for CH4 trim adjustments and the ST.D/R is used for CH4 end point adjustments.

Calibration

Use this function to correct for the mechanical deviation of the throttle trigger and steering wheel, for example, deviation occurred in the self- centering or maximum minimum travel, the steps are as following:

1. Turn and hold the steering wheel clockwise to its maximum travel and push the throttle trigger forward as far as possible, and at the same time turn on the transmitter. This puts the transmitter into calibration mode. The R.LED and G.LED will both repeat the sequence of “flashing twice-off-flashing twice”.
2. Steering Wheel Calibration: Turn the steering wheel to its maximum left and right position, back and forth. When calibration is completed, the R.LED will be off.
3. Throttle Trigger Calibration: Push/pull the throttle trigger to forward/backward as far as it will go. When calibration is completed, the G.LED will be of f.
4. Once calibration is complete, press the BIND button to save and exit. The G.LED will be lit solid.

Failsafe
The failsafe function is used to protect the model and surrounding people when the connection fails between the receiver and transmitter. The failsafe is activated when the transmitter is turned off, the transmitter batteries die, or if there is interference. By default, CH2 is the only channel with a failsafe setting. The other channels are not set.

• The failsafe for CH2 is enabled by default and the ESC will enter the braking state when the failsafe is activated.
• For the other channels, the interfaces will maintain the last output when the failsafe is activated.

Setting the failsafe:

1. With the transmitter and ESC both turned ON, hold the control corresponding to the channel at the desired failsafe position.
2. Thenpress and hold the BIND button for 3 seconds. The G.LED will flash for 2 seconds, indicating that the failsafe setting was saved successfully.

Beginner Mode

Beginner mode is designed for people who are new to the hobby.
In this mode, throttle output is limited to 50 percent and the channel range by default is set to 1250~1500~1750us.
Setup:
To switch between beginner mode and normal mode, press and hold the CH4 button while turning the steering wheel counterclockwise as far as it will go. While holding, power on the transmitter. The G.LED will flash in a sequence of “flash-flash-off, flash-flash-off”, indicating beginner mode is activated.
Note: By default, the system is set to normal mode each time it is turned on.

Low Voltage Protection & Overheating Protection

This receiver has a low voltage protection function.

• Low Voltage Protection: When the battery voltage is detected to be lower than the safe operating range, power output to all channels will be cutoff.

This receiver/ESC also has an overheat protection function that will cutoff power to CH2 when activated. Once the receiver/ESC cools down to normal operating temperature, CH2 will resume to it’s normal operating power output.
Note: In the event there is a blockage in the drive train, the receiver/ESC will cutoff power to the motor (CH2) to prevent damage to both the receiver/ESC unit and the motor. If this happens, inspect the vehicle and clear out anything that may be obstructing the drive-train from spinning freely. This may include lodged sticks, rocks, or anything else binding the drive-train.

Troubleshooting

battery into the ESC and try again. (PG.4)
2.  Contact Redcat support.
The vehicle ran backward when you pulled the throttle trigger towards you.| 1. The radio “Throttle Reverse” switch may be improperly set.
2.  The motor wiring is incorrect.| 1.  Switch the radio “Throttle Reverse” switch. (PG.5)

2.  Be sure the motor is plugged in correctly. The red wire connects to the tab labelled (+) on the motor .

Vehicle moves with no throttle input.| 1. Throttle trim is not set properly.
2. The transmitter needs to be calibrated.| 1. Set transmitter throttle trim. (PG.5)
2. Calibrate the transmitter. (PG.5)
The motor suddenly stops working.| 1. Transmitter signal is lost
2. The battery pack needs charging or the thermal protection may have been activated.| 1.  Be sure the transmitter has good batteries and is turned on.
2.  Check the battery voltage and the ESC temperature. Let cool and recharge battery. (PG.7)
The receiver/ESC is powered on, but nothing works and the LED on the receiver/ESC is blinking slowly.| 1. The receiver isn’t picking up the transmitter sygnal.| 1. Be sure the transmitter is turned on.
2. Put new batteries in the transmitter. (PG.2)
3. BIND the transmitter to the receiver/ESC
The receiver/ESC is powered on, but nothing works and the LED on the receiver/ESC is blinking quickly.| 1. The receiver is in BIND mode. (PG.3 LED Status)| 1. Be sure the transmitter is turned on and power on the receiver/ESC again. (PG.4)
Clicking noise while steering.| 1. The servo horn is stripped.
2. The servo gears are stripped.| 1. Replace the servo horn.
2. Replace the servo.
Vehicle won’t steer or move.| 1.  Battery pack not charged.
2.  Battery wires loose.
3.  Did not follow proper start-up instructions.| 1. Charge the battery pack.
2. Plug in the battery securely (PG.4)
3. Follow the start-up sequence on (PG.4)
Vehicle turns to the side automatically.| 1.  Steering trim needs adjusting.
2.  Steering servo horn needs realigning or replaced.
3.  Servo gears are stripped.| 1. Adjust transmitter steering trim. (PG.5)
2. Check servo horn, replace if worn or stripped.
3. Replace the servo.
Vehicle steers to the left when you steer to the right.| 1.  Steering reverse (on transmitter) is set incorrectly.
2.  You are driving towards yourself and it just seems like it’s backwards.| 1.  Set the steering reverse on transmitter. (PG.5)
2.  Practice driving the vehicle to get used to steering with different vehicle orientations. When driving towards yourself, it just seems like the steering is backwards.

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SCALE FUN FOR EVERYONE
IMPORTANT LINKS:

• To view the full length manual with ESC guide, Radio guide, exploded views and parts lists, go to: www.redcatracing.com/pages/manuals
• Link to electric vehicles manual: www.redcatracing.com/manuals/ELECTRIC-MANUAL.pdf

Documents / Resources

| REDCAT R3C 4 Channel Radio [pdf] User Manual
R3C 4 Channel Radio, R3C, 4 Channel Radio, Channel Radio, Radio
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