AKK A1918 5.8G Long Range VTX FPV Transmitter Instruction Manual

1. Product Overview

The AKK A1918 is a high-performance 5.8G FPV video transmitter (VTX) designed for long-range applications. It features switchable power outputs, SmartAudio support for convenient configuration, and a built-in microphone for audio feedback. This VTX is compatible with a wide range of FPV setups, offering reliable video transmission for your drone or RC vehicle.

Figure 1.1: Front view of the AKK A1918 VTX, showing the 'Race Ranger' branding and AKK logo.

Figure 1.2: Package contents including the A1918 VTX, MMCX antenna, connection cable, and product manual.

2. Key Features

• SmartAudio Support: Allows for convenient VTX settings changes (channels, output power) directly through Betaflight OSD.
• One-Button Control: Manual adjustment of channel, band, and power settings via a single button on the VTX.
• Built-in Microphone: Provides audio feedback from your FPV setup, enabling you to hear your quad even at a distance.
• Wide Voltage Input: Supports 7-28V input, compatible with 2-6S LiPo batteries.
• 5V Output: Provides a stable 5V power supply for your FPV camera.
• Switchable Power Output: Adjustable power levels of 200mW, 400mW, 800mW, and 1000mW for varied range requirements.

Figure 2.1: The A1918 VTX shown with its included connection cables and MMCX antenna.

3. Setup and Installation

3.1 Physical Dimensions and Components

Before installation, familiarize yourself with the VTX's dimensions and component layout. The unit measures 36mm (W) x 36mm (D) with 30.5mm mounting holes.

Figure 3.1: Detailed diagram showing the dimensions, MMCX connector, heatsink, button, microphone, and LED indicators for channel, band, and power.

3.2 Wiring Diagram

The A1918 VTX uses a JST, 6-pin connector for power and signal connections. Refer to the pinout diagram in Figure 3.1 for correct wiring.

• VIN: Input voltage (7-28V)
• GND: Ground
• 5V OUT: 5V output for FPV camera
• VIDEO: Video signal input from FPV camera
• AUDIO: Audio signal input (if applicable, or for SmartAudio)
• SMARTAUDIO: SmartAudio control line (for OSD control)

Figure 3.2: Side view of the VTX, highlighting the MMCX antenna connector and the 6-pin JST connector.

Figure 3.3: Close-up view of the MMCX antenna connector, ensuring secure antenna attachment.

3.3 Antenna Connection

Connect the provided MMCX antenna to the VTX. Ensure a firm connection to prevent signal loss. Always connect the antenna before powering on the VTX to avoid damage.

4. Operating Instructions

4.1 SmartAudio Control

The A1918 VTX supports SmartAudio, allowing you to configure settings directly from your flight controller's OSD (On-Screen Display) in Betaflight. Connect the SmartAudio pin of the VTX to a UART TX pad on your flight controller and enable SmartAudio in Betaflight configurator.

4.2 Manual Button Control

If SmartAudio is not used, you can manually change the VTX settings using the single button on the unit (refer to Figure 3.1).

• Short Press: Cycles through channels (CH1-CH8). The blue LEDs indicate the current channel.
• Long Press (2 seconds): Cycles through frequency bands (Band A, B, E, F, Race Band). The green LEDs indicate the current band.
• Very Long Press (5 seconds): Cycles through power levels (200mW, 400mW, 800mW, 1000mW). The red LEDs indicate the current power output.

4.3 Frequency and Power Table

The following table details the available frequencies across different bands and channels, as well as the corresponding power output levels.

Figure 4.1: Comprehensive table of specifications, including input voltage, features, power supply, output power, antenna connector, cable connector, dimensions, weight, kit contents, and detailed frequency bands and channels.

5. Maintenance and Care

To ensure the longevity and optimal performance of your AKK A1918 VTX, follow these maintenance guidelines:

• Heat Management: The VTX is equipped with a heatsink. Do not remove the heatsink as it is crucial for dissipating heat and preventing damage to the internal components. Ensure adequate airflow around the VTX during operation.
• Cleanliness: Keep the VTX free from dust, dirt, and moisture. Use a soft, dry cloth for cleaning. Avoid using liquid cleaners.
• Connection Integrity: Regularly check all cable connections (power, video, SmartAudio, antenna) to ensure they are secure and free from damage. Loose connections can lead to signal loss or intermittent operation.
• Storage: When not in use, store the VTX in a dry, cool environment, away from direct sunlight and extreme temperatures.

6. Troubleshooting

If you encounter issues with your AKK A1918 VTX, consider the following troubleshooting steps:

• No Video Signal:
  • Verify that the VTX is powered on and receiving adequate voltage.
  • Check the video input connection from your FPV camera to the VTX.
  • Ensure your FPV receiver is on the correct frequency and band matching the VTX.
  • Confirm the antenna is securely connected to the VTX and not damaged.
• Poor Video Range/Quality:
  • Increase the VTX output power if operating in an open area (refer to Section 4.2).
  • Check for obstructions between the VTX and receiver.
  • Ensure both VTX and receiver antennas are correctly oriented and compatible.
  • Inspect antennas for damage.
• SmartAudio Not Working:
  • Verify the SmartAudio wire is correctly connected to a UART TX pad on your flight controller.
  • Ensure SmartAudio is enabled and configured correctly in Betaflight configurator for the specific UART.
  • Check for firmware compatibility issues between the VTX and flight controller.
• Overheating:
  • Ensure the heatsink is not obstructed and has sufficient airflow.
  • Avoid operating the VTX without an antenna connected, as this can cause rapid overheating and damage.
  • Consider adding additional cooling if operating in confined spaces or at high power levels for extended periods.

7. Technical Specifications

For detailed technical specifications, please refer to Figure 4.1 in Section 4.3. Key specifications include:

• Input Voltage: 7V to 28V
• Output Power: 200mW/400mW/800mW/1000mW switchable
• Antenna Connector: MMCX
• Cable Connector: JST, 6-pin
• Dimensions: 36(W) x 36(D) mm, 30.5 x 30.5 mm (hole spacing)
• Weight: 16.81g (excluding antenna)
• Special Feature: Built-In Microphone

8. Important Regulatory Information

Please read the following information carefully before operating this device:

• This product is sold under the FCC's amateur radio rules.
• Operation of this product legally in the US requires an amateur radio license.
• Operators must comply with all applicable laws and hold an amateur license to operate this equipment.
• Unauthorized use of amateur equipment without a license may result in significant fines by the FCC.

9. Warranty and Support

This product is typically covered by a standard return policy, allowing for refund or replacement within 30 days of purchase. For specific warranty details, technical support, or assistance with product issues beyond the scope of this manual, please contact AKK Technology Inc. directly through their official support channels or the retailer from whom the product was purchased.

Manufacturer: AKK