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LinHT - Linux-based, SDR handheld transceiver.
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Wojciech Kaczmarski f2454bd04e tweaked the power-on circuit 
- supplied the XNOR gate with 5V instead of 3.3V
- added a MOSFET to drive the 3.3V DC/DC converter's EN pin
- removed a pull-up resistor at the ON/OFF line
2025-07-17 18:58:02 +02:00
parts Added footprint and 3D model for the PJ-204 audio 2.5 mm jack 2025-07-16 13:34:56 +02:00
photos added Retevis C62 mainboard's photos for reference 2025-07-10 18:02:33 +02:00
.gitattributes Added gitattributes to force Unix-style EOL 2025-07-14 16:50:00 +02:00
.gitignore Updated ignored files, removed fp-info-cache from the repository 2025-07-13 10:12:57 +02:00
audio.kicad_sch tweaked the power-on circuit 2025-07-17 18:58:02 +02:00
connectors.kicad_sch tweaked the power-on circuit 2025-07-17 18:58:02 +02:00
display.kicad_sch tweaked the power-on circuit 2025-07-17 18:58:02 +02:00
fp-lib-table Changed all EOLs from Windows (CRLF) to Unix style (LF) 2025-07-14 16:50:00 +02:00
keyboard.kicad_sch tweaked the power-on circuit 2025-07-17 18:58:02 +02:00
LICENSE.txt init push 2025-06-05 20:28:55 +02:00
linht-hw.kicad_pcb Assigned footprint and layout position of the 2.5 mm jack 2025-07-16 13:34:56 +02:00
linht-hw.kicad_pro Fixed constrains and board stackup based on PCBWay recommendations 2025-07-15 17:15:47 +02:00
linht-hw.kicad_sch tweaked the power-on circuit 2025-07-17 18:58:02 +02:00
linht-hw.pdf tweaked the power-on circuit 2025-07-17 18:58:02 +02:00
mcm-imx93-pinout.md Added PWM Pins 2025-07-15 12:18:20 +02:00
mux.kicad_sch Changed all EOLs from Windows (CRLF) to Unix style (LF) 2025-07-14 16:50:00 +02:00
power.kicad_sch tweaked the power-on circuit 2025-07-17 18:58:02 +02:00
README.md Update README.md 2025-07-16 12:58:55 +02:00
rf.kicad_sch tweaked the power-on circuit 2025-07-17 18:58:02 +02:00
soc.kicad_sch tweaked the power-on circuit 2025-07-17 18:58:02 +02:00
sym-lib-table Changed all EOLs from Windows (CRLF) to Unix style (LF) 2025-07-14 16:50:00 +02:00

README.md

CC BY-NC-SA 4.0

LinHT-hw

Open-source hardware, Linux-based, SDR handheld transceiver. OpenHT successor with greatly simplified hardware - no FPGAs involved. This project offers a replacement board for the Retevis C62 radio, greatly expanding its capabilities.

Hardware

The device uses an MCM-iMX93 System on Module (SoM) running Linux. The RF front-end is based on the Semtech SX1255. The chip is used as a complete IQ modulator/demodulator, allowing for true all-mode support.

Resources

CPU:

  • Dual-core ARM Cortex-A55 @ 1.7GHz
  • ARM Cortex-M33 coprocessor @ 250MHz
  • Floating Point Unit
  • ARM Ethos U-65 microNPU (Neural Processing Unit with Tensor Flow Lite support)

Memory:

  • 2GB LPDDR4
  • 64GB eMMC

RF:

  • 500kHz bandwidth complete IQ transceiver

Software

Developers can use C/C++/Python as well as (or in conjunction with) GNU Radio flowgraphs. Tools such as gcc are built-in. The Linux image will be published later.

Supported modes (so far):

  • M17 - transmission and reception,
  • TETRA - reception only,
  • Demo 64QAM transmission at 2Mbps

Other modes can be added later (analog FM/AM/SSB, FreeDV, APRS, etc.).

License

This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.

CC BY-NC-SA 4.0