Icom IC-905

Icom IC-905 firmware

Icom · IC-905 · IC-905 · VHF/UHF transceiver

Latest firmware for the Icom IC-905 is v1.20 (October 2, 2025).

Specifications

IC-905 specifications

Type
Amateur VHF/UHF/SHF transceiver
Frequency range
Europe / TX: 144-146 / 430-440 / 1240-1300 / 2300-2450 / 5650-5850 MHz / RX: 144-146 / 430-440 / 1240-1300 / 2300-2450 / 5650-5850 MHz / USA / TX: 144-148 / 430-450 / 1240-1300 / 2300-2310 / 2390-2450 / 5650-5925 MHz / RX: 144-148 / 430-450 / 1240-1300 /
Modes
AM / FM / SSB / CW / RTTY / DV & DD (D-Star) / FM-ATV / Selectable audio subcarriers for ATV: 4.5, 6.0 and 6.5 MHz / (Also 5.5, 7.02 and 7.2 MHz from firmware v1.15 and up)
Show the full specification

General

Mode
AM / FM / SSB / CW / RTTY / DV & DD (D-Star) / FM-ATV Selectable audio subcarriers for ATV: 4.5, 6.0 and 6.5 MHz (Also 5.5, 7.02 and 7.2 MHz from firmware v1.15 and up)
Type
Amateur VHF/UHF/SHF transceiver
Weight
Controller: 940 g (2.1 lb) RF unit: 3.2 Kg (7.1 lb)
Power supply
13.8 VDC ±15% (Barrel jack)
Tuning steps
Down to 1 Hz
Other features
Analog A/V in/out for ATV (75 ohm, 1 Vpp). SD-card slot. USB-C connector. 4.3" touch screen color display. Spectrum scope and waterfall. LAN ports. SWR meter (Except for the optional bands). IPX5 weatherproof outdoor RF unit.
Frequency range
Europe TX: 144-146 / 430-440 / 1240-1300 / 2300-2450 / 5650-5850 MHz RX: 144-146 / 430-440 / 1240-1300 / 2300-2450 / 5650-5850 MHz USA TX: 144-148 / 430-450 / 1240-1300 / 2300-2310 / 2390-2450 / 5650-5925 MHz RX: 144-148 / 430-450 / 1240-1300 / 2300-2310 / 2390-2450 / 5650-5925 MHz 3 cm / 10.0-10.5 GHz option (CX-10G) 1.2 cm / 24 GHz option (CX-24G)
Dimensions (W*H*D)
Controller: 200*84*82 mm (7.9*3.3*3.2") RF unit: 172*87*210 mm (6.8*3.4*8.3")
Frequency stability
Less than ±65 ppb (GPS stabilized OCXO) Outdoor RF unit: -10 to +55°C (14 to 131°F)
Repeater shift / offset
Programmable
Channels / memory management
500 regular in up to 100 groups 25 scan edge pairs (Program scan) 12 call (2 in each band) 2500 repeater 300 GPS Non-volatile EEPROM storage
Antenna impedance / connector
2 m/70 cm/23 cm 50 ohm / N-jack 13 cm 50 ohm / SMA 6 cm 50 ohm / SMA (There is also an SMA connector for the GPS antenna)
Current drain / power consumption
RX: Max 3 A TX: Max 5.5 A

Miscellaneous

Manufactured
Japan, 2023-202x

Receiver Section

Selectivity
AM (BW=6 KHz) 6 KHz (-3 dB) 15 KHz (-60 dB) FM (BW=15 KHz) 12 KHz (-6 dB) 20 KHz (-60 dB) SSB (BW=2.4 KHz) 2.4 KHz (-3 dB) 3.6 KHz (-60 dB) CW (BW=500 Hz) 500 Hz (-3 dB) 700 Hz (-60 dB) RTTY (BW=500 Hz) 500 Hz (-3 dB) 700 Hz (-60 dB) DV (12.5 KHz spacing) -50 dB DD (300 KHz spacing) -40 dB
Sensitivity
AM (10 dB S/N) 2 m: 1 uV 70 cm: 1 uV 23 cm: 1 uV 13 cm: 1 uV 6 cm: 1.4 uV 3 cm: 1.12 uV (With optional CX-10G) 1.2 cm: ? uV (With optional CX-24G) FM (12 dB SINAD) 2 m: 0.17 uV 70 cm: 0.17 uV 23 cm: 0.17 uV 13 cm: 0.17 uV 6 cm: 0.25 uV 3 cm: 0.22 uV (With optional CX-10G) 1.2 cm: ? uV (With optional CX-24G) SSB/CW (Filter: SOFT. 10 dB S/N) 2 m: 0.11 uV 70 cm: 0.11 uV 23 cm: 0.11 uV 13 cm: 0.11 uV 6 cm: 0.15 uV 3 cm: 0.14 uV (With optional CX-10G) 1.2 cm: ? uV (With optional CX-24G) DV (1% BER (PN9)) 2 m: 0.35 uV 70 cm: 0.35 uV 23 cm: 0.35 uV 13 cm: 0.35 uV 6 cm: 0.5 uV 3 cm: ? uV (With optional CX-10G) 1.2 cm: ? uV (With optional CX-24G) DD (1% BER (PN9)) 23 cm: 1.58 uV 13 cm: 1.58 uV 6 cm: 2.23 uV 3 cm: ? uV (With optional CX-10G) 1.2 cm: ? uV (With optional CX-24G) FM-ATV (Measured on the first US demo unit) -80 dBm (Threshold for noise free P5 video) -90 dBm (Threshold for detection) Sensitivity for the European version (Analog modes) AM (BW=4 KHz, 60% modulation, 12 dB SINAD) 2 m: 0 dBuVemf 70 cm: 0 dBuVemf 23 cm: 0 dBuVemf 13 cm: 0 dBuVemf 6 cm: 0 dBuVemf 3 cm: ? dBuVemf (With optional CX-10G) 1.2 cm: ? dBuVemf (With optional CX-24G) FM (BW=7 KHz, 60% modulation, 12 dB SINAD) 2 m: 0 dBuVemf 70 cm: -6 dBuVemf 23 cm: -6 dBuVemf 13 cm: -6 dBuVemf 6 cm: -6 dBuVemf 3 cm: ? dBuVemf (With optional CX-10G) 1.2 cm: ? dBuVemf (With optional CX-24G) SSB/CW (BW=2.4 KHz, Filter: SOFT, 12 dB SINAD) 2 m: -6 dBuVemf 70 cm: -6 dBuVemf 23 cm: -6 dBuVemf 13 cm: -6 dBuVemf 6 cm: -6 dBuVemf 3 cm: ? dBuVemf (With optional CX-10G) 1.2 cm: ? dBuVemf (With optional CX-24G)
Image rejection
SSB/CW 2 m/70 cm: 70 dB 23 cm/13 cm/6 cm: 50 dB AM/FM/DV 2 m / 70 cm: 60 dB 23 cm/13 cm/6 cm: 50 dB DD 23 cm/13 cm/6 cm: 50 dB
Receiver system
RF direct sampling (2 m/70 cm) Down conversion IF sampling (23 cm/13 cm/6 cm) 23 cm: 331-371 MHz 13 cm / 6 cm: 1st: 914 MHz band, 2nd: 346 MHz band
AF output power / speaker
Internal speaker: 530 mW at 10% distortion / 12 ohm External speaker: 200 mW at 10% distortion
External speaker connector
TS "Minijack" (3.5 mm), 8 ohm

Transmitter Section

RF output power
2 m:10 W (AM: 2.5 W) 70 cm:10 W (AM: 2.5 W) 23 cm:10 W (AM: 2.5 W) 13 cm:2 W (AM: 500 mW) 6 cm:2 W (AM: 500 mW) 3 cm:500 mW (AM: 125 mW) With optional CX-10G using 13 cm (2.4 GHz) IF 1.2 cm:500 mW (AM: 125 mW) With optional CX-24G using 13 cm (2.4 GHz) IF
Modulation system
AM: Digital low power modulation FM: Digital reactance modulation SSB: Digital PSN modulation DV: Digital GMSK modulation DD: Digital GMSK modulation ATV: Digital reactance modulation
Spurious emissions
Better than --43 to -60 dB (Depending on band)
Microphone input level
? mV
Max FM deviation (Factory set)
FM: ±5 KHz NFM: ±2.5 KHz
Microphone impedance / connector
2.2 Kohm / TRRS "Subminijack" (2.5 mm)

Changelog

IC-905 firmware changelog

  1. v1.15 v1.20 Adds 256 GB SDXC card support, improves repeater search and picture sharing features.

  2. v1.14 v1.15 Added ATV Audio Sub Carrier Frequency options and improved GPS frequency synchronization.

  3. v1.13 v1.14 Fixed bug causing transmit output to stop

  4. v1.12 v1.13 Improved communication resilience with automatic recovery during RF unit interruptions.

  5. v1.11 v1.12 Improved RF unit detection dialog when CX-10G is connected during startup.

  6. v1.03 v1.11 Adds DV Repeater Monitor with route icon display and improved call sign handling

  7. v1.03 first tracked

Firmware history

All versions below were published by Icom on icomjapan.com, icomamerica.com, icomeurope.com and icom.co.jp. Third-party and modified firmware is never listed.

  1. Version 1.20 Latest Released Oct 2, 2025 First seen Sep 6, 2026

    Adds 256 GB SDXC card support, improves repeater search and picture sharing features. — summary by updatemystuff.com

    Source: icomjapan.com

    Show release notes

    Changes from Version 1.15

    • Improved the importing repeater list.

    Supported importing repeater list while retaining the existing order.

    • Added the ability to select other near repeaters using the dial after entering​ an access repeater using the Near Repeater Search function on the DR screen.
    • Improved the Share Pictures function.
    • Added the percentage display for the picture data received.
    • Added the visibility of the received block.
    • Improved so that a beep sounds after finishing the transmission using the DV Fast Data function.
    • Added an option for the Digital Repeater Set function.
    • Changed the display unit "m" from less than 1 km to less t​han 10 km on screens that display distance, such as the GPS position screen.
    • Supported for SDXC cards up to 256 GB

    Formatting on the transceiver is required.

    Release notes & download
  2. Version 1.15 Released Mar 29, 2024 First seen Sep 7, 2026

    Added ATV Audio Sub Carrier Frequency options and improved GPS frequency synchronization. — summary by updatemystuff.com

    Source: icomjapan.com

    Show release notes

    Changes from Version 1.14

    -Added the 5.5 MHz, 7.02 MHz, ​and 7.2 MHz options to the ATV Audio Sub Carrier Frequency item in the Function set item.

    -Improved the GPS synchronization of the reference​ frequency adjustment.

    Refer to INFORMATION IC-905 Version 1.15 for details.

    Release notes & download
  3. Version 1.14 Released Mar 7, 2024 First seen Sep 7, 2026

    Fixed bug causing transmit output to stop — summary by updatemystuff.com

    Source: icomjapan.com

    Show release notes

    Changes from Version 1.13

    -Fixed a bug that caused the transmit output to stop transmitting.

    • If the firmware is updated after the "The R​F unit is not detected." dialog is displayed at startup, the firmware of the RF unit is not updated. After restarting, the " RF CPU firmware is wrong version. Retry updating the firmware." dialog will appear.

    In that case, update the firmware from the state that the RF unit is correctly recognized (the state ​the "The RF unit is not detected." dialog is not displayed).

    If the "The RF unit is not detected" dialog is repeatedly displayed after restarting, disconnect the CX-10G and update the firmware.

    Release notes & download
  4. Version 1.13 Released Jan 25, 2024 First seen Sep 7, 2026

    Improved communication resilience with automatic recovery during RF unit interruptions. — summary by updatemystuff.com

    Source: icomjapan.com

    Show release notes

    Changes from Version 1.12

    -Improved that the communication between the controller and the RF unit was momentarily interrupted and automati​cally recovered during the operation, "A communication error occurred between the controller and the RF unit." dialog not displayed.

    • If the firmware is updated after the "The RF unit is not detected." dialog is displayed at startup, the firmware of the RF unit is not updated. After restarting, the " RF CPU firmware is wrong version. Retry updating the firmware." dialog will appear.

    In that ca​se, update the firmware from the state that the RF unit is correctly recognized (the state the "The RF unit is not detected." dialog is not displayed).

    If the "The RF unit is not detected" dialog is repeatedly displayed after restarting, disconnect the CX-10G and update the firmware.

    Release notes & download
  5. Version 1.12 Released Nov 30, 2023 First seen Sep 7, 2026

    Improved RF unit detection dialog when CX-10G is connected during startup. — summary by updatemystuff.com

    Source: icomjapan.com

    Show release notes

    Changes from Version 1.11

    -Improved the " The RF unit is not detected." dialog, which sometimes appears when the transceiver is turne​d ON with the CX-10G connected.

    -Other minor changes

    • If the firmware is updated after the "The RF unit is not detected." dialog is displayed at startup, the firmware of the RF unit is not updated. After restarting, the " RF CPU firmware is wrong version. Retry updating the firmware." dialog will appear.

    In that case, update the firmware from the state that the RF unit is correctly recognized (the ​state the "The RF unit is not detected." dialog is not displayed).

    If the "The RF unit is not detected" dialog is repeatedly displayed after restarting, disconnect the CX-10G and update the firmware.

    Release notes & download
  6. Version 1.11 Released Aug 18, 2023 First seen Sep 7, 2026

    Adds DV Repeater Monitor with route icon display and improved call sign handling — summary by updatemystuff.com

    Source: icomjapan.com

    Show release notes

    Changes from Version 1.03

    • Added the DV Repeater Monitor function. (You can connect to a DPlus-compatible repeater.）

    When moni​toring the Destination repeater selected in “TO,” it is necessary to read the Connection IP Address List file.

    You can download the Connection IP Address List sample file from here .

    • Displays the Receiving (or Transmitting) route icon (RF or TM: Terminal mode or MONI: DV Repeater Monitor) on the RX History Log and QSO Log.
    • Displays the Receiving (or Transmitting) route icon (RF or TM: Terminal mode or MONI: DV Repeater Monitor) to the chunk information in the QSO audio file.
    • Displays the Receiving route icon (TM: Terminal mode or MONI: DV Repeater Monitor) to the following screens;

    RX HISTORY screen

    GPS POSITION (RX) screen

    QSO audio, PLAY FILES screen

    QSO audio, FILE INFORMATION screen

    -Improves the​ CI-V command 1F 01 (DV transmit call sign) so you can set only the “UR” call sign without the other call signs.

    -Improved the Terminal/AP Call sign setting of the DV GATEWAY screen can be registered call signs where the seventh character is not blank.

    Release notes & download
  7. Version 1.03 Released Aug 17, 2023 First seen Sep 7, 2026

    Source: icomjapan.com

    Show release notes

    This is the first release.

    Release notes & download

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