SVXLink TRXrptr HAT

The TRXrptr is a highly adaptable repeater controller that integrates DAC/ADC technology and essential audio filtering to enhance sound quality. Designed for seamless compatibility with any Raspberry Pi, it ensures uninterrupted operation by automatically bypassing audio/COS or PTT in the event of a power loss.

This board enables PTT (Push-To-Talk) transmission and COR (Carrier Operated Relay) or COS (Carrier Operated Signal) reception via GPIO. The COS detection input supports a wide voltage range from 3V to 30V for added flexibility.

Features & Compatibility

For ease of integration, the TRXrptr package includes a Breakout Board, simplifying wiring connections for your repeater setup. This board also features adjustable trimmers to fine-tune audio gain and impedance matching.

The TRXrptr has been successfully tested with:

✔ Motorola MTR2000
✔ Motorola MTR3000
✔ Hytera MD780
✔ Kenwood MD380
✔ Expected compatibility with most other repeaters

It is an excellent solution for setting up an EchoLink/SVXLink analog repeater system.

Key Specifications

• Datasheet & Raspberry Pi Pin Compatibility
• PCB with Electroless Nickel Immersion Gold (ENIG) finish
• Adjustable RX and TX volume (via software & optional trimmers on the breakout board)
• Wolfson WM8960 ADC/1W DAC, 48 kHz sampling rate
• COS signal detection (3V – 30V input range)
• Status LEDs for clear identification:
• COS Signal (Blue LED)
• PTT Signal (Blue LED)
• Audio Bypass Override (Blue LED)
• PTT or COS/COR Bypass Override (Blue LED)
• Low power consumption when used with a Raspberry Pi Zero W running SVXLink
• Idle mode: 192mA

Software & Resources

GitHub Repository: 
🔗 SVXTRXRepeater Software

GitHub Repository for split RX/TX TX: 
🔗 https://github.com/Guru-RF/TX-Repeater-SVXLink

GitHub Repository for split RX/TX RTL-SDR RX :
🔗 https://github.com/Guru-RF/RTL-SDR-RX-Repeater-SVXLink