1. Introduction
This manual provides detailed instructions for the setup, operation, maintenance, and troubleshooting of your Mokxihit Upgraded Duplex DMR Hotspot. This device is designed to facilitate digital voice communication across various modes, including DMR, YSF, D-STAR, and P25.
Figure 1: Mokxihit Duplex DMR Hotspot
2. Package Contents
Please verify that all items listed below are included in your package:
- Raspbery P Model 2B x1
- Duplex MMDVM hotspot board x1
- OLED display x1 (pre-installed on board)
- 8G TF card x1 (pre-configured)
- Wireless WiFi module x1
- Acrylic Shell x1
- 433Mhz UHF Antenna x2
- USB Cable x1
- User Manual (this document)
3. Setup Guide
Your hotspot comes with most Pi-Star settings pre-configured on the TF card for ease of use. It is set to duplex mode, OLED type 3, and STM32 GPIO type. A temporary WiFi parameter (SSID: m100, password: abc12345) is set, and default TX/RX frequencies are 439.550.000 MHz and 433.550.000 MHz respectively, with zero offset.
3.1. Initial Connection
For the first-time setup, it is highly recommended to connect the hotspot directly to your router using a network cable. This bypasses the need for immediate WiFi configuration.
Figure 2: Hotspot Ports and Connections
3.2. Antenna Installation
Carefully screw the two 433MHz UHF antennas onto the designated antenna ports on the hotspot. Ensure they are finger-tight to avoid damage.
Figure 3: Hotspot with Antennas Installed
3.3. Powering On
Connect the provided USB cable to the 5V USB port on the hotspot and to a mobile charger, computer, or laptop. The device will power on, and the OLED display will activate.
3.4. Accessing the Pi-Star Dashboard
Once powered on and connected to your network (via Ethernet or the temporary WiFi), open a web browser on a device connected to the same network and navigate to http://pi-star/. This will open the Pi-Star Digital Voice Dashboard.
Figure 4: Pi-Star Digital Voice Dashboard Interface
3.5. Essential Configuration
Within the Pi-Star dashboard, you will need to set the following parameters:
- Your callsign
- Your DMR ID
- Your hotspot security (for BrandMeister network)
Additionally, ensure your walkie-talkie's TX frequency is set to 433.550.000 MHz and RX frequency to 439.550.000 MHz, which are opposite to the hotspot's default settings for proper duplex operation.
Video 1: All-New Duplex DMR Dstar YSF Hotspot Digital Voice Modem. This video demonstrates the unboxing, component identification, and initial setup steps for the Mokxihit Duplex DMR Hotspot, including connecting antennas and powering on the device.
4. Operating Instructions
The Mokxihit Duplex DMR Hotspot supports various digital voice modes, including DMR, YSF, D-STAR, and P25. It operates in both duplex and single modes.
4.1. Supported Modes
- DMR (Digital Mobile Radio)
- YSF (Yaesu System Fusion)
- D-STAR
- P25
The basic setup frequency is 433.550000 MHz for DMR. Ensure your radio is configured to communicate with the hotspot on the correct frequencies and modes.
5. Maintenance
To ensure the longevity and optimal performance of your hotspot, follow these maintenance guidelines:
- Keep the device in a clean, dry environment, away from direct sunlight and extreme temperatures.
- The acrylic shell can be cleaned with a soft, damp cloth. Avoid abrasive cleaners.
- Ensure proper ventilation around the device to prevent overheating.
- Use a stable 5V power supply. While mobile chargers and laptop USB ports can be used, a dedicated 15W or higher adapter is recommended for consistent performance.
6. Troubleshooting
If you encounter issues with your hotspot, refer to the following common problems and solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| OLED display not active | Incorrect OLED type setting in Pi-Star; power issue. | Verify OLED type 3 is selected in Pi-Star configuration. Ensure stable 5V power supply. |
| Cannot access Pi-Star dashboard | Network connectivity issue; incorrect URL. | Ensure Ethernet cable is securely connected or WiFi module is properly installed and connected to your network (2.4GHz only). Verify you are using http://pi-star/ or the assigned IP address. |
| No digital voice activity | Incorrect radio settings (callsign, DMR ID, frequencies); hotspot security not set. | Double-check your callsign, DMR ID, and hotspot security in the Pi-Star dashboard. Confirm your walkie-talkie's TX/RX frequencies match the hotspot's opposite settings. |
7. Specifications
| Feature | Detail |
|---|---|
| Product Dimensions | 5.9 x 3.9 x 1.6 inches (108mm x 76mm x 30mm) |
| Item Weight | 7.8 ounces |
| Connectivity Technology | USB, Ethernet, WiFi (2.4GHz) |
| Compatible Devices | Laptop, Digital Radios (DMR, YSF, D-STAR, P25) |
| Total Ethernet Ports | 2 |
| Power Supply | 5V (via Micro USB) |
| Antenna Type | 433Mhz UHF (2 included) |
| Screen | Two Colors OLED (Yellow and Blue) |
Figure 5: Hotspot Dimensions
8. Warranty Information
This product is covered by a standard manufacturer's warranty. Please retain your proof of purchase for any warranty claims. For specific details regarding warranty terms and conditions, refer to the documentation provided at the time of purchase or contact the seller directly.
9. Support
For technical assistance, troubleshooting beyond this manual, or general inquiries, please contact Mokxihit customer support. Contact information can typically be found on the product packaging or the seller's official website. We aim to respond to inquiries within 6 hours.