QCC3040 Bluetooth 5.3 Audio Receiver Transmitter User Manual

1. Introduction

The YET-TX20 is a versatile 2-in-1 Bluetooth 5.3 Audio Adapter designed for both receiving and transmitting audio signals. Equipped with a Qualcomm QCC3040 chip, it offers high-fidelity, lossless sound quality with ultra-low latency. This device allows you to easily add Bluetooth functionality to non-Bluetooth audio equipment, enabling wireless audio streaming in various scenarios, from home entertainment systems to car audio.

Image: The YET-TX20 Bluetooth Adapter shown with a smartphone, illustrating its receiving and transmitting capabilities.

2. Package Contents

Please check the box for the following items:

• 1 x YET-TX20 Bluetooth Adapter Unit
• 1 x USE Guide (Instruction Manual)
• 1 x 3.5mm Audio Cable
• 1 x USB Charging Cable (Type-C)

Image: Visual representation of the YET-TX20 product and its included accessories.

3. Specifications

Image: Detailed product parameters including model, Bluetooth version, battery, and dimensions.

4. Product Overview

Familiarize yourself with the device's ports and controls:

• RX AUX Port: 3.5mm audio input for Receiver mode.
• USB-C / Charge Port: For charging the device and for USB audio input (PC).
• TX AUX Port: 3.5mm audio output for Transmitter mode.
• Pairing Key: Used to initiate Bluetooth pairing.
• Audio Format Switch Key: Toggles between different audio formats (e.g., SBC, APTX HD, AAC).
• Indicator LED: Displays current mode (TX/RX) and active audio codec (SBC, X, AD, HD, AAC).

Image: Front and top view diagram of the YET-TX20, highlighting its various ports, buttons, and LED indicators.

5. Setup

5.1 Charging the Device

1. Connect the supplied USB-C charging cable to the USB-C port on the YET-TX20.
2. Plug the other end of the cable into a DC-5V USB power adapter (not included) or a computer's USB port.
3. The indicator LED will show charging status. A full charge takes approximately 3 hours and provides about 22 hours of working time.

Image: Visual guide to the device's battery life and charging duration.

5.2 Power On/Off

Press and hold the Power/Pairing key for a few seconds to turn the device on or off.

5.3 Connection Methods

The YET-TX20 supports two primary connection methods for audio input/output:

• 3.5mm AUX: Use the included 3.5mm audio cable to connect to devices with a 3.5mm audio jack.
• USB-C: For PC audio input, connect the device to your computer via the USB-C port.

Image: Illustration of connecting the adapter via USB-C to a laptop and via USB-C with an AUX cable to an audio source.

6. Operating Instructions

The YET-TX20 operates in two modes: Receiver (RX) and Transmitter (TX).

6.1 Switching Modes

Use the dedicated mode switch button (often labeled with RX/TX or an arrow icon) to toggle between Receiver and Transmitter modes. The indicator LED will show the active mode.

Image: Visual guide to the integrated receiver/transmitter functionality, suitable for multiple devices.

6.2 Receiver (RX) Mode

In RX mode, the YET-TX20 receives Bluetooth audio from your smartphone, tablet, or other Bluetooth-enabled devices and outputs it to non-Bluetooth audio equipment.

1. Switch the device to RX mode.
2. Connect the YET-TX20's RX AUX port to your non-Bluetooth speaker, amplifier, or car audio system using the 3.5mm audio cable.
3. On your smartphone or tablet, search for Bluetooth devices and select "YET-TX20" to pair.
4. Once paired, audio from your device will stream wirelessly to your connected audio equipment.

Image: The adapter connected to a speaker in RX mode, enabling Bluetooth audio streaming.

Image: The adapter used in a car's AUX system in RX mode. Note that call functionality is not supported in this configuration.

6.3 Transmitter (TX) Mode

In TX mode, the YET-TX20 transmits audio from non-Bluetooth devices (like TVs or PCs) to Bluetooth headphones or speakers.

1. Switch the device to TX mode.
2. Connect the YET-TX20's TX AUX port to your TV, PC, or other audio source's audio output (e.g., headphone jack) using the 3.5mm audio cable. Alternatively, connect the YET-TX20 to your PC via the USB-C cable for digital audio transmission.
3. Put your Bluetooth headphones or speakers into pairing mode.
4. Press the Pairing key on the YET-TX20 to initiate pairing. The device will automatically search for and connect to nearby Bluetooth audio devices.
5. Once paired, audio from your source device will stream wirelessly to your Bluetooth headphones/speakers.

Image: The adapter connected to a PC in TX mode, providing Bluetooth audio functionality.

6.4 Dual Device Connection (TX Mode)

The YET-TX20 can connect to two Bluetooth devices simultaneously in TX mode, offering ultra-low latency for an enhanced audio experience.

1. Follow steps 1-4 for TX mode to pair with the first Bluetooth device.
2. Once the first device is connected, put the second Bluetooth device (e.g., another pair of headphones) into pairing mode.
3. Press the Pairing key on the YET-TX20 again to connect the second device.
4. Both devices will now receive audio simultaneously.

Image: The adapter connected to two Bluetooth headphones/earbuds simultaneously in TX mode, demonstrating ultra-low latency.

6.5 Audio Format Switching

Press the Audio Format Switch Key to cycle through available audio codecs (SBC, APTX, APTX HD, AAC). The indicator LED will show the currently active codec.

7. Maintenance

• Keep the device dry. Moisture can damage the internal circuitry.
• Do not expose the device to extreme temperatures.
• Clean the device with a soft, dry cloth. Avoid using harsh chemicals or abrasive cleaners.
• Store the device in a cool, dry place when not in use.

8. Troubleshooting

8.1 No Sound / Poor Audio Quality

• Ensure the YET-TX20 is fully charged.
• Verify that the correct mode (RX or TX) is selected for your setup.
• Check all audio cable connections (3.5mm AUX or USB-C) are secure.
• Ensure the volume on both the YET-TX20 and the connected audio devices is turned up.
• Confirm that the YET-TX20 is successfully paired with your Bluetooth device(s).
• Try switching audio codecs using the Audio Format Switch Key.
• Reduce the distance between the YET-TX20 and connected Bluetooth devices, ensuring no major obstructions.

8.2 Pairing Failure

• Ensure the YET-TX20 is in the correct mode (RX for receiving, TX for transmitting).
• Place the YET-TX20 and the target Bluetooth device close to each other (within 1 meter).
• Put both devices into pairing mode.
• Clear previous Bluetooth connections on both devices and try pairing again.
• Restart both the YET-TX20 and the target Bluetooth device.

8.3 Short Transmission Distance

• Ensure there are no physical obstructions (walls, large furniture) between the YET-TX20 and the connected Bluetooth device.
• Avoid placing the device near sources of strong electromagnetic interference (e.g., Wi-Fi routers, microwave ovens).
• The maximum working distance is approximately 10 meters in an open environment.

Image: Illustration of the 10-meter transmission range within a home environment.

9. User Tips

• Optimal Audio Quality: For the best sound experience, ensure both the YET-TX20 and your connected audio devices support the same high-quality codecs like aptX HD or AAC.
• Dedicated Use: If primarily using the device in one mode (RX or TX), keep it set to that mode to avoid accidental switching.
• Car Audio Note: When using in a car, remember that call functionality is not supported through the YET-TX20.
• PC Connectivity: For PC use, connecting via USB-C can offer a more stable digital audio signal compared to analog AUX.

10. Warranty and Support

For warranty information or technical support, please refer to the seller's policies or contact the manufacturer directly. Keep your purchase receipt as proof of purchase.