Enjoy D-STAR Communication More Actively and More Comfortably

Entry Level D-STAR Mobile with Big Rig Features
Since the introduction of D-STAR in 2001, Icom has been committed to improving and advancing the D-STAR experience. The ID-4100A and its advanced technology do just that! The upgraded user interface and new enhancements provide a product other digital voice models cannot match!

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.

D-STAR System Introduction
Find the D-STAR system introduction and features from here. 

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.

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.

Note for the Terminal mode and Access point mode

  • You need an Internet connection with an IPv4 Global IP address. If you use a cellular system, you need an IPv4 Global IP address assigned to your Windows® or Android™ device.
  • Before you set up the Access point, check any regulations or laws in your country.
  • When operating in the Access Point mode, you need two call signs. One for the Access Point transceiver and one for the Remote D-STAR transceiver.
  • For the Access point or Terminal mode operation, you must register your MY and Access point call signs with a Gateway repeater/server that has the RS-RP3C installed.

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.

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.

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.

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*

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, weather channels*2 and other VHF and UHF utility communications.

*1 Working range not guaranteed.

*2 USA version only

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.

UDP Hole Punch function

The UDP Hole Punch function enables Access Point mode or Terminal mode communication (limited function), even if you cannot forward port 40000, or a Global IP address is not assigned to your device. This function is convenient when you are using a free Wi-Fi hotspot.


  • RS-MS3W/RS-MS3A version 1.30 or later is required.
  • You can communicate with individual stations, or stations that are listening to a repeater, whichever you set in “TO.” Once your transmit signal passes through a punched port, a reply (receive) signal can pass back through the port.
  • You cannot hear calls from stations that initiate a call to you.
  • See the RS-MS3W or RS-MS3A instruction manuals for precautions and setting details.

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)


Frequency coverage

USA Version Transmit: 144–148, 430–450 MHz
Receiver: 118–174, 230–550*1 MHz
EXP Version Transmit: 137–174, 400–470*2 MHz
Receiver: 118–174, 230–550*2 MHz
Type of emission F2D, F3E, F7W
Mode DV, FM, FM-N, AM (RX only), AM-N (RX only)
Operating temperature range −10°C to +60°C;
+14°F to +140°F
Frequency stability ±2.5ppm
(−10°C to +60°C on the basis of 25°C)
Antenna impedance 50Ω (SO-239)
Number of memory channels 1000 regular channels,
4 call channels,
50 program scan edges,
1500 repeater memories
and 300 GPS memories
Power supply requirements 13.8V DC ±15%
Current drain (approximate) TX 13.0A
RX 1.2A/0.9A (Max.audio/Stand-by)
(W×H×D, Projections are not included)
Main unit + Controller 150×40×171.9 mm;
5.9×1.6×6.8 in
Controller 122×40×29.9 mm;
4.8×1.6×1.2 in
Weight (approximate) Main unit 1.1kg; 2.4 lb
Controller 100g; 3.5 oz

Guaranteed range:
*1 144–148, 430–450MHz.

*2 144–148, 430–440MHz


Output power (at 13.8V DC) 50W, 15W, 5W (Hi, Mid, Low)
Max. frequency deviation ±5.0kHz/±2.5kHz (W/N)
Spurious emissions Less than −60dBc
Microphone impedance 600Ω (8-pin modular)


Intermediate frequencies 46.35MHz/450kHz (1st/2nd)
Sensitivity FM/FM-N Less than 0.18μV
(amateur bands at 12dB SINAD)
DV Less than 0.22μV
(at 1% BER)
Squelch sensitivity Less than 0.13μV
Selectivity FM/FM-N More than 60dB/55dB
DV More than 50dB
Spurious and image rejections More than 60dB
Audio output power More than 2.0W
(10% distortion, 8Ω load)
External speaker connector 2 condcutor 3.5 (d) mm (1/8″)/8Ω
Receiver sensitivity
(Except amateur bands)
(12dB SINAD)
137–159.995MHz Less than 0.32μV
160–174.000MHz Less than 0.32μV
230–259.995MHz Less than 1.8μV
260–321.995MHz Less than 0.56μV
322–374.995MHz Less than 0.56μV
375–399.995MHz Less than 0.56μV
400–499.995MHz Less than 0.32μV
500–550.000MHz Less than 0.56μV
(10dB S/N)
118–136.991MHz Less than 1.0μV
230–259.995MHz* Less than 5.6μV
260–321.995MHz* Less than 1.8μV
322–374.995MHz* Less than 1.8μV

* Only AM mode.
All stated specifications are subject to change without notice or obligation.

Supplied Accessories

  • Hand microphone, HM-207S
  • DC power cable, OPC-345B
  • Controller cable, OPC-837 (3.5 m; 11.4 ft)
  • Microphone hanger
  • Spare fuse

Catalogs / Brochures

Brochures Name Size
ID-4100A 634KB
HAM Radios and Receivers 5.87MB
D-STAR System Introduction 1.97MB

Instruction Manual / Guides

Name Model Name Note
Instruction Manual CS-4100
Basic Manual ID-4100A/ID-4100E
D-STAR Guide ID-4100A/ID-4100E
Advanced Manual ID-4100A/ID-4100E
About the DV Gateway function ID-4100A/ID-4100E
About the UDP Hole Punch function ID-51A (PLUS2)/ID-51E (PLUS2) /ID-31A PLUS/ID-31E PLUS/ID-4100A/ID-4100E/IC-9700
D-STAR Application Guide ID-52A/ID-52E/IC-705/IC-9700/IC-7100/ID-4100E/ID-4100A/ID-5100E/ID-5100A/ID-51E/ID-51A/ID-31E/ID-31A/ID-31E PLUS/ID-31A PLUS/RS-MS1A/RS-MS1I/RS-MS3A/ST-4001A/ST-4001I
D-STAR Updating the repeater list ID-52E/ID-52A/IC-705/IC-9700/IC-7100/ID-4100E/ID-4100A/ID-5100E/ID-5100A/ID-51E/ID-51A/ID-31E/ID-31A/ID-31E PLUS/ID-31A PLUS

Firmware / Software

Type Model Name Version Last Update
Repeater List, GPS Data, and Setting Data ID-4100A 20170315 Sep.26.2017
Firmware ID-4100A, ID-4100E Version 1.05 Jan.31.2020
Cloning software ID-4100A, ID-4100E Revision 1.00 Apr.24.2017