VOIP CM119B Interface

This project is a small PCB which incorporates the latest CM119B chip to interface a single radio to the AllStarLink network.

Features:

All SMD

Interfaces signals

PTT, COS, CTCSS,

Tx and Rx Audio

LEDs for easy identification of the node state.[1]

Completely assembled and tested!

This board is compatible with HAMVOIP Arm-Allstar and DIAL. It provides both audio and control signals in a single package.

The circuit uses the latest CM119B. This board is VERY small compared to other similar units and is intended to be mounted INSIDE of the radio. The .1" connector supports square pins headers and a connector with pendant cable to the radio allows quick disconnect.

The photo (above) shows the latest revision (left) which incorporates minor layout changes and provision for mounting on nylon hex posts (provided). The board on the right is electrically the same.

The photo (below) shows the newest rev with mounting screws. Just drill 2 holes in the lid of the radio and mount the board.

Note

1. Some features incorporated on the PCB are not yet available in the software, in particular, the operation of LEDs for COS, CTCSS and Connection Status.

Power for the interface is via USB from the RPi. The radio interface can be a pendant cable from the PCB to a 9 pin D-sub or a 6 pin header can be installed.

Photo (above) is on an early unit. This pic will be updated real soon now.

The gold extruded enclosure is approximately 1.5 *1.2 * 2" (50*38mm). The interface card slides into an integral slot. The unmodified case is available as an upgrade or can be purchased on ebay.

Radio Interface

Mount the PCB so the components face the radio lid. Mark and drill a 0.25" hole to allow the LEDs to be seen through the lid. It couldn't be much easier!

The radio interface is a 6 pin field on 0.1" centers. Wires can be soldered to the pads or a user provided 6pin header can be installed.

LEDs

Contact WØIY at barry.wØiy at gmail.com or use QRZ.

That's a ZERO (not letter ooooh) in the callsign. The FCC made me have a confusing email address!