1. Introduction
This manual provides detailed instructions for the setup, operation, and maintenance of your FM Transmitter. Please read this manual thoroughly before use to ensure optimal performance and safety. This device is designed for broadcasting audio signals over FM frequencies, suitable for various applications such as parking lot broadcasts, events, or personal use.
2. Package Contents
Verify that all items listed below are included in your package:
- 1x FM Transmitter Unit
- 1x Telescopic FM Transmitting Antenna
- 1x 3.5mm Audio Input Cable
- 1x USB Type-C Power Cable
3. Product Overview
The FM Transmitter is a compact, black rectangular unit featuring an LCD display and control buttons. It is designed for easy setup and operation.
3.1. Components
- Main Unit: Houses the electronics, display, and controls.
- LCD Display: Shows the current transmitting frequency.
- Control Buttons:
- DW (Down): Decreases frequency.
- UP (Up): Increases frequency.
- Step: Adjusts frequency step (e.g., 1MHz or 0.1MHz).
- RES (Reset): Resets settings.
- Antenna Connector: For attaching the telescopic antenna.
- 3.5mm Audio Input: Standard stereo audio input port.
- USB Type-C Port: For 5V power supply.
- Indicator Light: A red LED light indicates operation status.
4. Specifications
| Feature | Specification |
|---|---|
| Output Frequency | Adjustable, 76~108MHz (1MHz or 0.1MHz step), 320 transmitting frequencies, with memory function. |
| Output Power | 10~500mW (0.01~0.5W) @ 88-108MHz |
| Receiving Equipment | Ordinary FM radio capable of receiving FM broadcasts. |
| Display Mode | LCD display (shows current transmitting frequency). |
| Max Transmission Distance | Up to 2000 meters (in open areas). |
| Supply Voltage | 5V via USB Type-C |
| Supply Current | 500mA |
| Input Signal | Audio stereo, 3.5mm interface standard |
| Signal-to-Noise Ratio (SNR) | 63dB 0.05% THD |
| Material | Plastic |
| Color | Black |
| Package Dimensions (L x W x H) | 38 cm x 10 cm x 8 cm |
| Package Weight | 0.143 kg |
5. Setup
Follow these steps to set up your FM Transmitter:
- Attach the Antenna: Screw the telescopic FM transmitting antenna securely into the antenna connector on the top of the transmitter unit. Extend the antenna fully for optimal performance.
- Connect Audio Source: Plug one end of the 3.5mm audio cable into the audio input port on the transmitter. Connect the other end to your audio source (e.g., smartphone, MP3 player, computer).
- Connect Power: Plug the USB Type-C power cable into the Type-C port on the transmitter. Connect the other end to a 5V USB power adapter (not included) or a compatible USB port. The device will power on automatically.
6. Operating Instructions
Once the transmitter is set up and powered on, you can begin broadcasting:
- Power On: The device powers on automatically when connected to a 5V USB power source. The LCD display will light up, showing the current transmitting frequency.
- Adjust Frequency:
- Use the UP button to increase the transmitting frequency.
- Use the DW button to decrease the transmitting frequency.
- Set Frequency Step: Press the Step button to cycle through available frequency step increments (e.g., 1MHz or 0.1MHz). This allows for fine-tuning of the broadcast frequency.
- Reset Settings: Press the RES button to reset the transmitter to its default settings or a predefined state.
- Tune Receiver: On your FM radio receiver, tune to the same frequency displayed on the transmitter's LCD.
- Start Audio Playback: Begin playing audio from your connected audio source. The sound should now be broadcast and receivable on your FM radio.
Note on Output Power Adjustment:
The product specifications indicate an adjustable output power of 10~500mW. However, the provided documentation does not detail how to adjust this output power using the available buttons (DW, UP, Step, RES). Users may need to refer to additional product information or contact support for specific instructions on power adjustment.
7. Maintenance
To ensure the longevity and proper functioning of your FM Transmitter, follow these maintenance guidelines:
- Cleaning: Use a soft, dry cloth to clean the exterior of the device. Do not use liquid cleaners or solvents.
- Storage: Store the transmitter in a cool, dry place away from direct sunlight and extreme temperatures.
- Handling: Avoid dropping the device or subjecting it to strong impacts.
- Antenna Care: Handle the telescopic antenna gently to prevent bending or breaking.
8. Troubleshooting
If you encounter issues with your FM Transmitter, refer to the following troubleshooting tips:
- No Power / Display Off:
- Ensure the USB Type-C cable is securely connected to both the transmitter and a functioning 5V power source. Check if the power source is active.
- No Audio Output / Static on Receiver:
-
- Verify that the 3.5mm audio cable is properly connected to both the transmitter and your audio source.
- Ensure your audio source is playing sound and its volume is turned up.
- Confirm that your FM radio receiver is tuned to the exact frequency displayed on the transmitter's LCD.
- Check for strong local FM stations on the chosen frequency; try a different frequency if interference is present.
- Ensure the antenna is fully extended and positioned vertically.
- Poor Signal Quality / Limited Range:
-
- Extend the telescopic antenna fully and ensure it is vertical.
- Reduce the distance between the transmitter and the receiver.
- Minimize obstacles (walls, large metal objects) between the transmitter and receiver.
- Try a different transmitting frequency to avoid local interference.
- While the device supports adjustable output power, the method for changing it via the buttons is not specified. Ensure the device is operating at an appropriate power level for your desired range.
9. User Tips
- Optimal Antenna Placement: For the best transmission range and signal clarity, always ensure the telescopic antenna is fully extended and positioned vertically.
- Frequency Selection: Experiment with different frequencies within the 76-108MHz range to find the clearest channel in your specific environment, especially in areas with many active FM stations.
- Audio Source Volume: Adjust the volume on your audio source to a moderate level before connecting it to the transmitter to prevent distortion.
- Power Adjustment: While the device offers adjustable output power, the specific button sequence for this function is not detailed in this manual. If you require to change the output power, please consult the seller or manufacturer for further guidance.
10. Warranty and Support
For any technical support, warranty claims, or further inquiries regarding your FM Transmitter, please contact the seller or manufacturer directly. Keep your purchase receipt as proof of purchase.
