1. Introduction
The Gochanmi Y3 ER103 is a professional UHF wireless in-ear monitor system designed for various audio applications, including stage performances, studio monitoring, concerts, church services, conferences, and weddings. This system operates within the 530-580 MHz frequency range, offering 100 selectable channels and Bluetooth connectivity for versatile audio input. It provides reliable audio monitoring with a line-of-sight operating range of up to 150 meters.
2. Package Contents
Please verify that all items listed below are included in your package:
- 1 x Transmitter
- 1 x 6.35mm Audio Cable
- 1 x Power Supply
- 1 x User Guide
- 2 x TNC Antennas
- 2 x Bodypack Receivers
- 2 x Headphones
3. Product Overview
Familiarize yourself with the components of the Gochanmi Y3 bodypack receiver:

Image 3.1: Gochanmi Y3 Bodypack Receiver Components. This image highlights the key features of the bodypack, including the 3.5mm headphone jack, volume adjustment knob, LED display, channel adjustment buttons, and battery compartment.
- 3.5mm Headphone Jack: Connect your in-ear headphones or any 3.5mm input device here.
- Volume Adjustment Knob: Rotate this knob to increase or decrease the audio output level to your headphones.
- LED Display: Shows the current operating frequency and signal strength of the bodypack.
- Channel Adjustment Buttons (UP/DOWN): Used to navigate and select different channels.
- Battery Compartment: Houses two AA batteries, which power the bodypack receiver.
4. Setup
Follow these steps to set up your Gochanmi Y3 ER103 system:
- Install Batteries: Open the battery compartment on each bodypack receiver and insert two AA batteries, ensuring correct polarity.
- Connect Transmitter Power: Connect the provided power supply to the transmitter and plug it into an appropriate power outlet.
- Attach Antennas: Screw the TNC antennas securely onto the designated ports on the transmitter.
- Connect Audio Source: Connect your audio source (e.g., mixer, computer) to the transmitter using a 6.35mm cable, XLR cable, or via Bluetooth. The transmitter supports 6.35mm, XLR, and Bluetooth audio inputs.
- Power On: Turn on the transmitter and each bodypack receiver.
5. Operating Instructions
This section details how to operate your in-ear monitor system.
5.1. Frequency Pairing (IR Sync)
To ensure proper communication between the transmitter and bodypack receivers, frequency pairing is essential:

Image 5.1: Gochanmi Y3 ER103 Frequency Pairing. This image illustrates the process of synchronizing the bodypack receiver with the main transmitter unit to establish a stable frequency link.
- On the transmitter, select the desired channel using the UP/DOWN buttons or the SYNC button.
- On the bodypack receiver, press the SYNC button (if available) or align the IR port of the bodypack with the IR port of the transmitter.
- The frequency link is complete when the channel number displayed on your bodypack receiver matches the channel number displayed on the main transmitter unit.
- Repeat this process for any additional bodypack receivers you wish to use. The system supports connecting up to 100 bodypack receivers simultaneously.

Image 5.2: Gochanmi Y3 ER103 Multiple Unit Connectivity. This image demonstrates the system's capability to connect up to 100 bodypack receivers to a single transmitter, suitable for large-scale events.
5.2. Channel Adjustment
Use the UP and DOWN buttons on the bodypack receiver to manually change the operating channel if needed, for example, to avoid local interference.
5.3. Volume Control
Adjust the volume of your in-ear monitors using the dedicated volume adjustment knob on the bodypack receiver.
5.4. Bluetooth Functionality
The transmitter includes Bluetooth input. Pair your Bluetooth-enabled device with the transmitter to stream audio wirelessly to the system.
6. Maintenance
Proper maintenance ensures the longevity and optimal performance of your system:
- Cleaning: Use a soft, dry cloth to clean the surfaces of the transmitter and bodypack receivers. Avoid using liquid cleaners or solvents.
- Battery Replacement: Replace AA batteries in the bodypack receivers when the low battery indicator appears on the LED display or when performance degrades.
- Storage: Store the system in a cool, dry place away from direct sunlight and extreme temperatures when not in use.
- Cable Care: Handle all cables carefully to prevent damage. Avoid sharp bends or excessive pulling.
7. Troubleshooting
If you encounter issues with your Gochanmi Y3 ER103 system, consider the following tips to improve performance:
- Signal Interference: Ensure the transmitter and receiver antennas maintain a clear line of sight. Avoid placing the receiver near sources of radio wave emissions, magnetic objects, or most digital devices (e.g., CD players, computers, speakers, Wi-Fi routers).
- Receiver Placement: For optimal reception, try to place the receiver at a height of 1.5 meters (approximately 5 feet) from the ground and at least 1 meter (approximately 3 feet) away from walls or large metallic objects.
- No Audio Output: Check all cable connections, ensure the audio source is active, and verify that the volume on both the transmitter and bodypack receiver is adequately set. Confirm that the bodypack is correctly paired to the transmitter's channel.
- Poor Audio Quality: Check for potential interference sources as mentioned above. Ensure batteries in the bodypack are fresh. Verify that the audio input level to the transmitter is not too high (causing distortion) or too low.
8. Specifications
| Feature | Specification |
|---|---|
| Brand | Gochanmi |
| Model Name | Y3 ER103 |
| UHF Frequency Range | 530-580 MHz |
| Channels | 100 selectable |
| Transmission Method | FM (Transmitter), 4-DQPSK (System) |
| RF Output Power | 10mW / 50mW |
| Frequency Response | 60Hz-17KHz +/- 3dB |
| Total Harmonic Distortion (T.H.D.) | > 0.5% at 1KHz (Transmitter), 0.1% (System) |
| Display | Backlit LCD (Transmitter), LED Digital Tube (Bodypack) |
| Audio Input | 6.35 mm / XLR / Bluetooth |
| Audio Output | Mono (Transmitter), 6.3mm Headphone Jack (Transmitter), 3.5mm Headphone Jack (Bodypack) |
| Antenna | TNC |
| Power Supply | DC12V-18V / 1000mA or DC12-18V / 1500mA (Transmitter), 2x AA Batteries (Bodypack) |
| Operating Range | Up to 150m (line of sight) |
| Sampling Rate | 48 KHz |
| Transmission Speed | 204.8Kbps |
| Dynamic Range | > 90dB |
| Audio Transmission Delay | 3ms |
| Signal/Noise Ratio | >96dB |
| RX Sensitivity | <-94dBm |
| Bluetooth Version | 5.1 |
| Bluetooth Range | 10 Meters |
| Impedance | 8 Ohms (Headphones) |
| External Material | Metal, Plastic |
| Country of Origin | China |
9. Warranty and Support
This product comes with a 1-month seller warranty. For any technical assistance, troubleshooting, or warranty claims, please contact your seller or refer to the official Gochanmi support channels.
