MODEM73 is a KISS TNC frontend for the aicodix OFDM modem.
- Install dependencies
# Debian/Ubuntu/Pi
sudo apt install git build-essential libncurses-dev g++
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
- 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
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 four 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
# 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 default)
./modem73 --ptt cm108 --cm108-gpio 3
modem73 comes included with a update utility update.sh
To update to the latest version:
./update.sh