MODEM73 is a [KISS](https://en.wikipedia.org/wiki/KISS_(amateur_radio_protocol)) TNC frontend for the [aicodix](https://github.com/aicodix/modem) OFDM modem.  ## Building ### Windows? Windows fork by SP5LOT https://github.com/SP5LOT/modem73 ### Linux On a system with `apt`? Run the installer script: ``` ./install.sh ``` 1. Install dependencies ``` # Debian/Ubuntu/Pi sudo apt install git build-essential libncurses-dev g++ ``` #### Optional Addons ##### CM108 USB PTT Support CM108-based USB audio interfaces have GPIO pins that can be used for PTT control. To enable CM108 support, install libhidapi-dev before building. The Makefile will auto-detect it and enable the feature. ``` # Debian/Ubuntu/Pi - install before building sudo apt install libhidapi-dev ``` ---- 2. Clone aiocdix DSP libraries and build. ``` # Requires DSP, code, and modem libraries git clone https://github.com/aicodix/dsp.git git clone https://github.com/aicodix/code.git git clone https://github.com/aicodix/modem.git # Clone modem73 git clone https://github.com/RFnexus/modem73 # Your folders should look like this: #.../ #├── dsp/ # DSP library (aicodix) #│ └── ... #├── code/ # Code library (aicodix) #│ └── ... #├── modem/ # Modem library (aicodix) #│ └── ... #└── modem73/ # modem73 src # └── ... # Build cd modem73 make AICODIX_DSP=../dsp AICODIX_CODE=../code MODEM_SRC=../modem # Optional: move to /usr/local/bin sudo make install ``` ## Running & Operations By default, MODEM73 will listen on port 8001 All of the modes provided by the OFDM modem require a bandwidth of 2400 Hz and work over both FM and SSB. There are currently five PTT options: - NONE (speaker/mic over the air) - Rigctl - VOX - Serial - CM108 ``` # Start in UI mode ./modem73 # Start in headless mode ./modem73 --headless # See all options with: ./modem73 --help ``` ### PTT options ``` # Connect to rigctld for PTT control ./modem73 --rigctl localhost:4532 ``` while running `rigctld` ``` ./modem73 --ptt vox --vox-freq 1200 --vox-lead 500 --vox-tail 150 # 500ms vox lead and 150ms vox tail ``` ``` ./modem73 --ptt com --com-port /dev/ttyUSB0 --com-line rts ``` ``` # CM108 USB audio interface PTT (GPIO3 is the default) ./modem73 --ptt cm108 --cm108-gpio 3 ``` ### Control port A control port for modem73 will automatically start on port `8073` by default. View `CONTROL_PORT.md` for the full JSON spec ## Updating modem73 comes included with a update utility `update.sh` To update to the latest version: ``` ./update.sh ```