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# LinHT-hw
Open-source hardware, Linux-based, SDR handheld transceiver. [OpenHT](https://github.com/M17-Project/OpenHT-hw) 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](https://www.compulab.com/products/computer-on-modules/mcm-imx93-nxp-i-mx-93-som-smd-system-on-module) System on Module (SoM) running Linux. The RF front-end is based on the [Semtech SX1255](https://www.semtech.com/products/wireless-rf/lora-core/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].

[![CC BY-NC-SA 4.0][cc-by-nc-sa-image]][cc-by-nc-sa]

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