Init

2026-04-27 14:30:33 +00:00 · 2026-01-02 22:45:56 -05:00 · 2026-01-02 22:45:56 -05:00 · f58acebeb1
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+<p align="center">
+  <picture>
+    <source media="(prefers-color-scheme: dark)" srcset="https://i.ibb.co/LDNR23jg/MODEM73-white.png">
+    <source media="(prefers-color-scheme: light)" srcset="https://i.ibb.co/wZKznzrF/MODEM73-blk.png">
+    <img alt="MODEM73" src="https://i.ibb.co/wZKznzrF/MODEM73-blk.png">
+  </picture>
+</p>
+
+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. 
+
+
+![Screenshot](https://i.ibb.co/4ZhhvcQs/Peek-2026-01-01-10-41.gif)
+
+
+## Building
+
+
+1. Install dependencies
+
+```
+# Debian/Ubuntu/Pi
+sudo apt install git build-essential libncurses-dev g++  
+```
+
+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 four PTT options:
+- NONE (speaker/mic over the air)
+- Rigctl
+- VOX
+- Serial
+
+
+```
+# 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
+```
+
+
+