This guide will help you connect the TORUN HT DiGi digital interface to a Baofeng UV-5R for APRS (Automatic Packet Reporting System) operations.

Requirements

1. Hardware Needed

• TORUN HT DiGi digital interface
• Baofeng UV-5R handheld transceiver
• Smartphone (Android-based) or PC
• TRRS Cable or a compatible Baofeng audio cable
• APRS Software (APRSdroid for Android or Soundmodem for PC)
• GPS module (optional, if not using a phone's GPS)

Step 1: Connecting the TORUN HT DiGi to UV-5R

1. Prepare the Hardware

   • Ensure that the UV-5R is charged and working properly.
   • Attach the TORUN HT DiGi to the UV-5R using a Baofeng-compatible audio cable.
   • Connect the other end of the TORUN HT DiGi to a smartphone (via TRRS cable) or a PC.

2. Radio Configuration

   • Set VOX (Voice-Activated Transmission) to 1 in UV-5R.
   • Set the frequency to 144.390 MHz (for North America) or the appropriate APRS frequency for your region.
   • Set the power level to LOW to avoid unnecessary interference.
   • Ensure PTT (Push-To-Talk) activation via the interface is working.

Step 2: Configuring APRS Software

For Android (APRSdroid)

1. Install APRSdroid (Download here).
2. Configure APRS settings:
   • Set APRS callsign (e.g., S21AF-7).
   • Choose APRS-IS or RF-only mode.
   • Select AFSK 1200 Baud as the modulation.
   • Adjust volume levels so that transmissions are clear without distortion.
3. Set audio output to "Ringtone" (not voice mode).
4. Press "Start Tracking" to begin sending APRS data.

For PC (Soundmodem + APRSISCE/32)

1. Install Soundmodem (Download here).
2. Set AFSK 1200 baud rate and select the correct audio input/output.
3. Use APRSISCE/32 (Download) for real-time APRS tracking and messaging.

Step 3: Testing & Troubleshooting

• Verify the signal by checking APRS.fi (https://aprs.fi).
• Adjust VOX sensitivity if APRS packets do not transmit properly.
• Check I-Gates and repeaters nearby to confirm data transmission.
• Use an external GPS module if location tracking is inaccurate.

Final Notes

• Ensure your APRS path is correctly set (e.g., WIDE1-1, WIDE2-1 for digipeater use).
• Use headphones or a dummy load when testing to avoid unnecessary RF interference.
• Keep the phone volume at 3/4 level for clear AFSK audio transmission.

This setup allows real-time APRS tracking and messaging using the TORUN HT DiGi, UV-5R, and a mobile/PC APRS setup.

73! Happy APRS Tracking! 🚀