ID-4100A | RWB Communications | Icom | Suppliers of World-Class Land Mobile, Marine, Aviation and Amateur Radios








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  • D-STAR Digital Voice and Data Communication
  • New Access Point Mode and Terminal Mode
  • Compact, Detachable Controller
  • DR (D-STAR Repeater) Function
  • Easy to Read Full Dot Matrix display
  • DV/FM Near Repeater Search Function
  • Applications for iOS and Android devices*
  • Wireless operation with optional VS-3 Bluetooth Headset
  • DV Fast Data Mode
  • Integrated GPS Receiver
  • Wideband Receiver
  • Selectable LCD and Key Backlight Colour
  • microSD Card Slot


Enjoy D-STAR Communication More Actively and More Comfortably

Terminal Mode and Access Point Mode Expand Communication Coverage and Fun

Terminal and Access Point modes* enable you to enjoy long-distance D-STAR (Digital Smart Technology for Amateur Radio) communication through the Internet. You can access the D-STAR repeater network through the Internet, regardless of locations and conditions of nearby repeaters.

* An optional free download software, RS-MS3W is required to be installed in the PC. An optional free download application, RS-MS3A is required to be installed, in the Android™ device.

Terminal Mode

By connecting the ID-4100A to the Internet through a Windows® PC or Android™ device, the Terminal mode enables you to use a D-STAR repeater to make D-STAR gateway calls.

Terminal Mode

Access Point Mode

The Access Point mode enables another D-STAR transceiver to make D-STAR gateway calls through the ID-4100A connected to the Internet. 50 watts of output power can be used for a D-STAR access point.

Access Point Mode

Compact, Detachable Controller for Flexible Installation

The controller can be attached or detached from the main unit for flexible installation. By using the supplied OPC-837 controller cable, you can install the controller up to 3.5 meters (11.5ft) away from the main unit.

Vehicle installation example Installation example
Vehicle installation example
(Using the optional MBF-1 mount base
and MBA-8 controller bracket)
Installation example
(Using the optional OPC-2350LU data cable
and RS-MS3W software for Windows® PC)

DR (D-STAR Repeater) Function

The DR function makes D-STAR communications simple. By simply selecting a destination call sign in "To", and your access repeater in "From", you can talk with other D-STAR users. In addition, using the reflector function, you can talk through several repeaters at once.

Easy-to-Read Full Dot-Matrix Display

To increase the amount of display information, a full dot-matrix display is used in the ID-4100A. For example, Repeater list or GPS position information are clearly arranged and easy to read.

GPS position information example Repeater list example
GPS position information example                             Repeater list example

DV/FM Near Repeater Search Function

The DV/FM near repeater search function assists you in accessing nearby repeaters, even in areas you are visiting for the first time. The function searches for nearby repeaters using the repeater memories with the GPS position information.

* To use the near repeater search function, the position data of the repeater is required. The ID-4100A will be shipped with the D-STAR repeater memories preprogrammed, but the position data of some D-STAR repeaters may not be entered or exact.

Applications for iOS™ and Android™ devices*

The RS-MS1I (for iOS™ devices) and RS-MS1A (for Android™ devices) enable you to wirelessly connect to the ID-4100A and remotely set the DR functions, link with a map application and send/receive messages over the DV mode. In addition, pictures taken by a smart device can be transmitted via the DV Fast Data mode or DV mode.

* The optional UT-137 Bluetooth® unit must be installed in the ID-4100A. Some functions may not work properly, depending on smart devices used.
DR function setting example Text messaging example Sending picture example Repeater map example
DR function setting
Text messaging
Sending picture
Repeater map
©2014 Google - Map data
©2014 Google

DV Fast Data Mode*

By using the data place in voice frames, the ID-4100A transfers data 3.5 times faster (3480 bps) than in the conventional DV mode (with voice).

* The DV Fast Data mode is not compatible with the DV mode low-speed data communication

Wireless Operation with VS-3 Bluetooth® Headset*

The optional VS-3 Bluetooth® headset provides convenient wireless communication away from the transceiver. The VS-3 remotely controls the ID-4100A with three programmable buttons.
* The optional UT-137 Bluetooth® unit must be installed in the ID-4100A.

microSD Card Slot for Voice and Data Storage*

microSD card slot

When used with a microSD card, you can store various information including voice memory, TX voice message, QSO log, RX history log and GPS log data. Memory channels and other settings can be saved and loaded into the transceiver.
* A microSD card is required separately.

Integrated GPS Receiver

The integrated GPS receiver shows your own position, course, speed and altitude on the display and can be used for exchanging position reports, D-PRS and searching for nearby repeaters.

Wideband Receiver

The ID-4100A receives 118–174 and 230–550 MHz*1. You can listen to air band, marine, and other VHF and UHF utility communications.
*1 Working range not guaranteed.

Selectable LCD and Key Backlight Color

The backlight color of the LCD and keys is selectable from white, green, amber or blue. Using the backlight night time setting function, the display backlight brightness can automatically be changed when the designated time comes.

Selectable LCD and Key Backlight Color

Other Features

  • The QUICK key allows instant access to menus listing dedicated functions depending on mode
  • Multiple scan functions for Memory/Bank scan, Full scan, Band scan, Program scan, Program link scan, Duplex scan Tone scan and DR scan
  • 16 channels of DTMF memory (24-digit)
  • CTCSS/DTCS signaling with the split tone functions (analog mode)
  • 8.33 kHz air band channel reception
  • Auto repeater function (USA version only)
  • HM-207S remote-control hand microphone (supplied as standard)