What is Allstar?

Allstar leverages Voice Over IP (VoIP) to extend the range of line-of-sight radios via the internet, effectively bridging local and global radio communications.

Initial Build

To address the lack of Allstar nodes in my area, I constructed my own using a 144MHz mobile FM transceiver (Kenwood TM-241a), a Raspberry Pi 4B, and an RA-25 soundcard, sourced after extensive research.

Connecting the transceiver to the soundcard involved creating a custom cable, incorporating modifications to support push-to-talk and signal detection (COS). The setup, combined with AllstarLink software, allowed for global connections via a simple walkie-talkie.

Node V2: Enhancements

To mitigate interference issues in my complex, I transitioned to a Motorola CDM 1550LS+ for the 70cm band. This radio provided better noise handling and a straightforward COS interface, enhancing reliability and functionality.

Looking ahead, I planed to expand the setup with additional radios and a duplexer for a more robust repeater system.

Now a Repeater!!

As time went on, I found good details on an older Motorola GM300 radio to use as a dedicated receiver, along with a duplexer for about $100. What started as a simplex node is now a humble but decent repeater.

The current Repeater consists of the following:

• Transmitter: Motorla CDM1550-ls+ 400mhz Tranciever
• Reciever: Motorola Radius M130 (GM300 Family)
• Controller: Raspberry Pi 4b running Allstarlink 3
• Audio Interface: Masters Communications RA-25
• Duplexer: Decibel Products Transceiver Duplexer
• Antenna: Homebrew 1/4 Wave Ground Plane Antenna

Connection Guide

Refer to the KIT5LZ Allstar User Guide for current node information and connection details. The node is open for public use!