RS-MS3A

RS-MS3A: D-STAR Transceiver Internet Connectivity App for Android

The RS-MS3A is an Android application developed to enhance the functionality of compatible D-STAR transceivers by enabling communication over the Internet. It supports two primary modes: Terminal mode and Access Point mode. This allows users to extend their D-STAR operations beyond the range of traditional repeaters by utilizing Internet, LTE, or 5G networks through an Android device.

Key Features:

1. Terminal Mode: Operate your D-STAR transceiver via the Android app to communicate with other D-STAR users over the Internet. In this mode, the transceiver does not emit RF signals even when the PTT (Push-To-Talk) is engaged, as audio is transmitted through data networks.

2. Access Point Mode: Use the D-STAR transceiver as a Wireless LAN access point. The transceiver repeats signals received from the Android device to other D-STAR transceivers, facilitating extended network coverage.

Device Requirements:

- Android 8.0 or later
- Touch screen Android device
- Bluetooth and/or USB On-The-Go (OTG) host functionality
- Public IP address (either on the device or the connected router)

Compatible Transceivers (as of August 2025):

Via USB:
- ID-31A PLUS / ID-31E PLUS
- ID-4100A / ID-4100E
- ID-50A / ID-50E (Ver.1.31 or later)
- ID-51A / ID-51E ("PLUS2" only)
- ID-52A / ID-52E (Ver.1.31 or later)
- IC-705 (Ver.1.31 or later)
- IC-905 (Ver.1.31 or later)
- IC-9700

Via USB or Bluetooth:
- ID-52A PLUS / ID-52E PLUS (Bluetooth requires Ver.1.40 or later)

Important Notes:

- A public IP address is mandatory for operation. Users should consult their mobile carrier or ISP for availability, as additional charges or data limits may apply.
- Compatibility with all Android devices is not guaranteed.
- Disable Wireless LAN when using LTE/5G networks to avoid conflicts.
- USB power supply may be interrupted during sleep or power-saving modes. Adjust timeout settings in the app or device accordingly.
- Operation must comply with local regulations; a club station license is recommended.

For detailed setup instructions, download the manual from the official ICOM website.