1. Introduction
The HYT SM25A1 Remote Microphone is a robust and versatile accessory designed to enhance communication for Hytera mobile radios. Featuring an integrated screen display, speaker, and Push-to-Talk (PTT) functionality, this microphone provides convenient and clear audio transmission and reception. Its IP54 rating ensures durability in various operating environments. This manual provides essential information for the proper setup, operation, and maintenance of your SM25A1 remote microphone.
2. Product Overview
The SM25A1 remote microphone is designed for ease of use and durability. Key components include a clear display, programmable buttons, a powerful speaker, and a sensitive microphone.
Figure 2.1: Front view of the SM25A1 remote microphone with coiled cable.
Figure 2.2: Close-up of the SM25A1 remote microphone's screen and control buttons (P1, P2, navigation).
Figure 2.3: Back view of the SM25A1 remote microphone, highlighting the rotating clip.
Components:
- Display Screen: Shows channel, zone, battery status, and signal strength.
- PTT Key: Push-to-Talk button for transmitting.
- Emergency Key: For emergency signaling.
- P1/P2 Buttons: Programmable function keys.
- Navigation Buttons: For menu and channel selection.
- Speaker: For clear audio reception.
- Microphone: For voice input.
- 10-pin Connector: For connecting to the mobile radio.
- Coiled Cable: Provides flexibility and reach.
- Rotating Clip: For attaching the microphone to clothing or a mount.
3. Setup
3.1 Connecting to Mobile Radio
- Ensure your Hytera mobile radio is powered off before connecting the microphone.
- Align the 10-pin connector of the SM25A1 remote microphone with the corresponding port on your Hytera mobile radio.
- Gently push the connector into the port until it clicks securely into place. Do not force the connection.
- Once connected, you may power on your mobile radio. The microphone's display should activate.
Figure 3.1: SM25A1 remote microphone connected to a Hytera mobile radio.
3.2 Mounting the Microphone
The SM25A1 comes with a rotating clip for easy attachment and a mounting bracket for fixed installations.
- Using the Clip: Attach the rotating clip to your uniform, belt, or other convenient location for quick access.
- Using the Mounting Bracket: For vehicle or desk use, secure the provided mounting bracket using the screws. The microphone can then be securely placed into the bracket.
Figure 3.2: SM25A1 remote microphone with mounting bracket and screws.
3.3 Compatibility
The HYT SM25A1 Remote Microphone is compatible with the following Hytera mobile radio models:
- Hytera MD650
- Hytera MD652
- Hytera MD655
- Hytera MD656
- Hytera MD658
- Hytera MD780
- Hytera RD650
4. Operating Instructions
4.1 Basic Communication
- Receiving: When a signal is received, audio will be heard through the microphone's speaker.
- Transmitting (PTT): To transmit, press and hold the PTT key located on the side of the microphone. Speak clearly into the microphone. Release the PTT key to stop transmitting and return to receive mode.
4.2 Display and Navigation
The integrated display provides real-time information about your radio's status.
Figure 4.1: SM25A1 display showing channel, zone, battery, and signal indicators.
- Channel/Zone Display: The screen typically shows the current channel number and zone.
- Battery Indicator: Displays the remaining battery life of the connected mobile radio.
- Signal Strength: Indicates the strength of the received signal.
- Navigation Buttons (< / >): Use these buttons to scroll through channels, zones, or menu options as configured on your mobile radio.
- P1/P2 Buttons: These are programmable keys. Their functions depend on the configuration of your mobile radio. Common functions include channel up/down, zone selection, or quick access to specific features. Refer to your mobile radio's manual for specific programming details.
4.3 Emergency Key
The orange Emergency Key is typically used to initiate an emergency alarm or call, depending on your radio's programming. Pressing this key will activate the pre-programmed emergency function.
5. Maintenance
5.1 Cleaning
- Wipe the microphone's exterior with a soft, damp cloth.
- Do not use harsh chemicals, solvents, or abrasive cleaners.
- Ensure the connector port is free from dust and debris. Use a soft brush if necessary.
5.2 Environmental Considerations
- The microphone has an IP54 rating, meaning it is protected against dust ingress and splashing water from any direction. It is not designed for immersion in water.
- Operating Temperature: –30℃ to 60℃.
- Storage Temperature: –40℃ to 85℃.
- Avoid exposing the microphone to extreme temperatures, direct sunlight for prolonged periods, or high humidity.
5.3 Cable Care
- Avoid excessive pulling, twisting, or bending of the coiled cable to prevent internal damage.
- Regularly inspect the cable for any signs of wear or damage.
6. Troubleshooting
- No Audio from Speaker:
- Check if the microphone is securely connected to the radio.
- Ensure the radio's volume is turned up.
- Verify that the radio is powered on and functioning correctly.
- Microphone Not Transmitting:
- Ensure the PTT button is fully pressed and held during transmission.
- Check the microphone connection.
- Confirm the radio is on an active channel and not in a scanning or busy state.
- Display Not Working:
- Ensure the microphone is properly connected and the radio is powered on.
- If the issue persists, try disconnecting and reconnecting the microphone.
7. Specifications
| Specs_Acc_Audio | |
|---|---|
| Dimensions | 92.8* 62.5* 32.1mm |
| Weight | about 160 g |
| Color | black |
| PTT Key | available |
| Emergency Key | available |
| Connector | 10-pin connector |
| Microphone Sensitivity | –42±3 dB @ 1 kHz 3.0 V 2.2 K, 0 dB = 1 V/Pa |
| Speaker Power | 2 W (rated); 3 W (max.) |
| Speaker Impedance | 20 Ω±15% @ 1.5 kHz |
| Speaker Frequency Response | 97±3 dB @ 1 kHz 2 W/30 cm |
| IP Rating | IP54 |
| Operating Temperature | –30℃ to 60℃ |
| Storage Temperature | –40℃ to 85℃ |
8. User Tips
- Cable Longevity: The coiled cable is designed for flexibility, but repeated harsh pulling or twisting can lead to internal wire damage. Always handle the cable gently, especially when connecting or disconnecting.
- Clear Communication: For optimal audio quality, speak directly into the microphone at a consistent distance. Avoid covering the microphone or speaker during use.
- Button Customization: Explore the programming options of your Hytera mobile radio to customize the P1 and P2 buttons on the remote microphone for functions that best suit your workflow.
9. Warranty and Support
For warranty information, please refer to the documentation provided with your original Hytera mobile radio or contact your authorized Hytera dealer. For technical support or inquiries regarding the SM25A1 remote microphone, please reach out to the manufacturer's customer service or your product supplier.
Product Demonstration Video
Video 9.1: Product demonstration of the HYT SM25A1 Remote Microphone.
