Radio Channel Logger

It seems to be a common requirement to make recordings of a radio or scanner output. I've not found much decent Free Software that can do this, and do it reliably in a headless configuration. What I've used is documented here, and will do 4 audio channels reliably.

My concept is based around a RPI 5 with Cmedia USB audio dongles as pictured below. This is compact and low power, while a full Linux environment allows you to do many other things as needed.

Features

• 4 audio channels
• Date/time logging down to the seconds
• Configuration of settings per channel
• Recordings are 8000 samples per second 16 bit WAV
• VOX activated recording with VOX level set per channel
• Low Overhead on as no voice coding is taking place, should run on a pi0 for at least one channel (not tested)
• 1tb ssd used for recording.

Hardware

RPI 5

• Case
• SSD
• nvme disk
• 4 usb jumpers
• PSU
• Cmedia Dongles

Radio

Per channel

• CDM radio
• CDM radio interface cable