Detrum SR86A-G Instruction Manual V1.0

Quick Start

Before installing, ensure:

• All surfaces are well connected to the servos by linkage rods.
• Bind the receiver to your transmitter in advance.
• All channel directions are set to the correct position, trims are set to zero.

Follow these steps to complete your first-time installation:

1. Mount the SR86A-G on the airframe and connect its required channels to the corresponding control surfaces.
2. Place the airplane on the ground and power it on. The LED on SR86A-G will start fast green flashing, indicating it is calibrating the gyro and sticks. Do not move the airplane or sticks during this period. After a successful initialization, the LED displays the current flight mode.
3. The default 6th channel is the flight mode switch, and the 8th channel is the return switch. Wave the flight mode switch and observe the LED color change.
4. CAUTION: The return switch is valid only when the airplane is airborne and the GPS is functioning correctly.
5. After successful initialization, use the transmitter to set programmable items (mounting direction, wing type, etc.).
6. Switch to Gyro Off Mode. Adjust neutral positions for all servos. Check servo movement direction by moving each stick individually. If a servo moves in the opposite direction, reverse it on your transmitter (refer to your transmitter's instruction manual).
7. CAUTION: If trims were set in this step, repeat Step 3 to initialize SR86A-G.
8. Switch to Normal Mode. Check gyro direction for each axis and reverse if necessary.
9. When using SR86A-G with the Blitz-DT9, GPS information can be viewed in the Blitz-DT9 downlink menu.
10. Use the transmitter to set programmable items (assign desired flight mode to the 3-position switch, adjust gain, etc.). After completing all settings, begin your first flight.

Introduction

The SR86A-G is an 8-channel 2.4GHz receiver integrated with a 6-axis gyro. It provides four different flight modes: Gyro Off, Normal, Aerobatic, and Auto-Recovery (Auto Balance). It can be programmed from the matched transmitter and can connect to GPS for return functionality.

Antennas

The receiver has two antennas. For optimal signal reception, position the antenna heads at a 90-degree angle to each other, ensuring they are not twisted together or parallel.

LED Indicator

The LED indicator on the SR86A-G provides status information about the receiver's operation, including binding, initialization, and flight modes.

Bind Button

The bind button is used to initiate the binding process between the receiver and the transmitter.

Interface

The SR86A-G features ports for GPS (SDA, GPS-RX, GPS-TX, SCL) and standard servo connections (Signal, VDD, GND) for each channel (AILE, ELEV, THRO, RUDD, GEAR, AUX1, AUX2, AUX3).

Note: For delta-wing airplanes, connect the left and right aileron servos to the AILE and ELEV channels. For V-tail airplanes, connect the left and right rudder servos to the ELEV and RUDD channels.

Installation

Mount the SR86A-G on the airframe using one of the provided double-sided tapes. Follow these principles for installation position:

• Close to the center of gravity (CG).
• The heading direction of SR86A-G must match the airplane's heading direction.
• The edges of SR86A-G should be parallel to the corresponding axes of the airplane.

SR86A-G can be attached flat or upright. There are four possible mounting directions: face up, face down, face left, and face right.

Installation Precautions:

• Use only one piece of double-sided tape at a time. Soft or thick mounting material may affect gyro performance.
• Use only the double-sided tape provided with the SR86A-G. Do not use hot-melt glue or belts.
• Ensure sufficient space around SR86A-G, keeping it away from motors, ESCs, and batteries. Avoid contact with servo horns, linkages, or other movable parts.
• Place antennas in an open space, ensuring they are not blocked. Position the antenna heads at a 90-degree angle to each other. Do not twist antennas together or place them in parallel.

Binding

Binding is essential for the transmitter and receiver to communicate. This process pairs them together. It is necessary when using the R/C system for the first time or when changing transmitters. Each transmitter has a unique ID code stored in the receiver after binding, eliminating the need for re-binding after restarting.

Preconditions:

• Ensure the transmitter is powered off and the throttle stick is in the lowest position.
• Place the transmitter and receiver within approximately 1 meter of each other.

Steps:

1. Power on SR86A-G. The LED indicator will flash red rapidly, indicating the transmitter is off.
2. Press and hold the Bind button for more than 2 seconds. The LED indicator will flash red slowly, signifying the receiver is in bind mode.
3. Put the transmitter into bind mode. The system will begin binding.
4. Once the LED on SR86A-G turns solid green, the receiver is bound to the transmitter. After 1 second, the LED will flash green rapidly, indicating the initialization process has begun.

Initialization

After powering on the RC system or completing the binding process, SR86A-G will enter the initialization phase. The LED will flash green rapidly, indicating gyro and stick calibration. Do not move the airplane or sticks during this period (up to 10 seconds), as this can cause repeated recalibration.

• Successful calibration results in SR86A-G switching to flight mode, with the LED indicating the current mode.
• If calibration fails, the LED will remain red, indicating that SR86A-G functions only as a receiver (gyro is unavailable). Restart the power to re-initialize SR86A-G.

Flight Mode

Use a 5-channel or higher transmitter. Assign a 3-position switch for flight mode control, ensuring it does not have other functions. This switch allows you to change flight modes.

The SR86A-G offers four distinct flight modes, indicated by the LED status (refer to LED Descriptions). The modes are:

• Normal Mode: The gyro senses angular velocity on each axis and makes momentary corrections. This mode enhances airplane stability, especially in windy conditions.
• Aerobatic Mode: Incorporates an attitude hold function. If no commands are sent from the transmitter, the gyro locks the airplane's previous attitude. This mode aids in performing aerobatic maneuvers. While using sticks, SR86A-G assists with stability without interfering with control inputs. Upon releasing the sticks, SR86A-G saves and locks the current attitude. Avoid drastic trim adjustments in Aerobatic Mode, as excessive trims can affect neutral position calibration. Set trims during testing and then power cycle the unit.
• Gyro Off Mode: Disables gyros for all channels. The airplane is solely controlled by the transmitter, and SR86A-G acts as a receiver. This mode is typically used for testing.
• Auto-Recovery Mode (Auto Balance Mode): Locks the tilt angle on the pitch and roll axes, allowing the airplane to maintain level flight and altitude automatically. Altitude and attitude are controllable during flight. In emergencies, switching to this mode from any other mode will automatically recover the airplane to level flight (one-click rescue). This mode is beneficial for beginners or FPV applications.
• Return Mode: Based on Auto-Recovery, this mode allows the airplane to plan a path and return to its starting point. Altitude is controllable during return flight. You can exit return mode at any time by activating the return switch. It supports one-button return and signal loss return.

Setting the Programmable Items

After installation and initialization, use the matched transmitter to set SR86A-G's programmable items. These include mounting direction, wing type, roll/pitch/yaw gain, flight mode, and roll/pitch offset. Refer to your transmitter's instruction manual for detailed setting methods.

Appendix

LED Descriptions

Specifications