microHAM ARCO

microHAM ARCO firmware

microHAM · ARCO · ARCO · Accessory

Latest firmware for the microHAM ARCO is v4.2.B (January 3, 2025).

ARCO firmware changelog

  1. v4.1.A v4.2.B

  2. v4.1.A v4.2.A

  3. v4.0.A v4.1.A

  4. v3.2.B v4.0.A Added moon and sun tracking, S75A rotator and brake driver support, and configuration transfer.

  5. v3.1.H v3.2.B

  6. v3.1.H v3.2.A

  7. v3.0.A v3.1.H

  8. v3.0.A v3.1.F

  9. v3.0.A v3.1.E

  10. v3.0.A v3.1.D

Firmware history

All versions below were published by microHAM on microham.com. Third-party and modified firmware is never listed.

  1. Version 4.2.B Latest Released Jan 3, 2025 First seen Sep 9, 2026

    Source: microham.com

    Show release notes
    • fixed touchs​creen issue intro​duced in v4.2.A
    Release notes & download
  2. Version 4.2.A Released Dec 3, 2024 First seen Sep 9, 2026

    Source: microham.com

    Show release notes
    • fixed display​ed time not changing on ARCO Jr.
    • fixed displayed azimuth when switching b​etween two remote ARCOs
    Release notes & download
  3. Version 4.1.A Released Sep 2, 2024 First seen Sep 9, 2026

    Source: microham.com

    Show release notes
    • support for A​RXC.WIND board added
    • ANTENNA CONTROLLED ARXC added
    • fixed calibration timeout for multiturn sensor
    • minor graphics f​laws fixed (windows sizes etc.)
    Release notes & download
  4. Version 4.0.A Released Apr 26, 2024 First seen Sep 9, 2026

    Added moon and sun tracking, S75A rotator and brake driver support, and configuration transfer. — summary by updatemystuff.com

    Source: microham.com

    Show release notes
    • numerous minor bug fixes and improvements
    • added automatic mode for ramps learning
    • two custom maps support
    • automatic timeout for all messages
    • expanded and renamed various error and status messages
    • colored pres​ets for ARXC Relay functions
    • added OFF ability for 1-of-N mode of AXRC Relay
    • added chaining possibility from ARXC Relay modules
    • added sensor raw value display
    • added choice to force local azimuth in screensaver
    • added support for external brake driver
    • added support for microHAM S75A rotator
    • improved INVERTER mode, Minarik drivers support
    • added STOP button to VNC
    • added configuration transfer from ARCO to ARCO over LINK
    • added spread​ spectrum function to PWM driver
    • added moon and sun tracking in presets using AZI@M, AZI@S, ELE@M, ELE@S preset names
    • ARCO Junior support
    Release notes & download
  5. Version 3.2.B Released Dec 15, 2022 First seen Sep 9, 2026

    Source: microham.com

    Show release notes
    • fixed minor i​ssue with pulse sensors stopped counting when ​Calibration menu exited while rotator is turning
    Release notes & download
  6. Version 3.2.A Released Dec 8, 2022 First seen Sep 9, 2026

    Source: microham.com

    Show release notes
    • fix to retain M-​TURN POT calibr​ation upon firmware update
    Release notes & download
  7. Version 3.1.H Released Dec 2, 2022 First seen Sep 9, 2026

    Source: microham.com

    Show release notes
    • fixed ARXC.MAG primary sens​or calibration incorrect displa​y
    • startup azimuth display improvement
    Release notes & download
  8. Version 3.1.F Released Nov 21, 2022 First seen Sep 9, 2026

    Source: microham.com

    Show release notes
    • improved M-TURN POT readout
    Release notes & download
  9. Version 3.1.E Released Oct 27, 2022 First seen Sep 9, 2026

    Source: microham.com

    Show release notes
    • support for MODBUS/OMRON Q2V added
    Release notes & download
  10. Version 3.1.D Released Oct 20, 2022 First seen Sep 9, 2026

    Source: microham.com

    Show release notes
    • overlap zone en​d-edge indication added
    • overlap reversal by tapping o​n overlap icon added
    Release notes & download
  11. Version 3.1.C Released Oct 17, 2022 First seen Sep 9, 2026

    Source: microham.com

    Show release notes
    • custom map ​option added
    • overlap zones indication added
    • ​ARXC.REL-controlled antennas handling improved
    Release notes & download
  12. Version 3.1.B Released Sep 29, 2022 First seen Sep 9, 2026

    Source: microham.com

    Show release notes
    • support for ARXC.MAG bo​ard added
    • minimum touch duration parameter added
    • fixed d​ay/night background color change on main screen
    Release notes & download
  13. Version 3.0.A Released Jun 1, 2022 First seen Sep 9, 2026

    Source: microham.com

    Show release notes
    • support for ARXC relay boards added
    Release notes & download
  14. Version 2.1.C Released Mar 14, 2022 First seen Sep 9, 2026

    Source: microham.com

    Show release notes
    • fixed spur​ious false overtempe​rature message
    Release notes & download
  15. Version 2.1.B Released Feb 22, 2022 First seen Sep 9, 2026

    Source: microham.com

    Show release notes
    • vnc server implemented
    Release notes & download
  16. Version 2.0.C Released Jan 11, 2022 First seen Sep 9, 2026

    Source: microham.com

    Show release notes
    • touch resp​onsivity setting added​ to System menu
    Release notes & download
  17. Version 2.0.A Released Dec 20, 2021 First seen Sep 9, 2026

    Adds adjustable 3dB beamwidth per antenna, improves mains hum suppression, and reorganizes menus. — summary by updatemystuff.com

    Source: microham.com

    Show release notes
    • 3dB beamwidth added, adjustable per antenna
    • antennas setup in separat​e submenu (Heading-Antennas)
    • time is displayed in screensaver
    • improved mains hum suppression for Pot/Multiturn Pot
    • in Heading-Calibration menu, Sensor Position indicates unadjusted​ position for resistive sensors
    • adjustable minimum backlight in System menu
    • MAC address displayed in LAN menu
    Release notes & download
  18. Version 1.4.A Released Oct 22, 2021 First seen Sep 9, 2026

    Added Moon position display, improved Link remote control, and LAN password security. — summary by updatemystuff.com

    Source: microham.com

    Show release notes
    • added Moon position calculation/display
    • improved remote control through Link (control via buttons, transfer of presets, status)
    • improved automatic aspects of ​Link functionality (Sync/Align, Tower, Rotating Tower, indicators)
    • motor current is now displayed also in menu Heading tab
    • LP/SP implemented in keyboard view
    • QRB displayed when entering locator in keyboard view
    • QRB displayed in status when touch'n'turn used
    • improved decision when to redraw maps
    • added 18V to vo​ltages selection, corrected actual DC output voltages
    • changed default voltage for Prosistel rotators
    • added HyGain CD-44 and AR-40
    • implemented highlight of last used preset
    • implemented LAN remote control password, and DNS for Client
    Release notes & download
  19. Version 1.3.A Released Sep 8, 2021 First seen Sep 9, 2026

    Source: microham.com

    Show release notes
    • test version
    Release notes & download
  20. Version 1.2.A Released Aug 23, 2021 First seen Sep 9, 2026

    AC rotator automin and button rampdown fixed, new BUTTON USE RAMPS option. — summary by updatemystuff.com

    Source: microham.com

    Show release notes
    • fixed incorrect auto​min for AC rotators
    • fixed buttons rampdown to be proportional to rampup for AC rotators
    • brake/PSU off is delayed by 5 sec after last movement
    • hold delay range expanded down to 0.1 sec
    • new option BUTTON USE RAMPS (in​ Menu->General) - if unchecked, buttons use CALIB SPEED set in Menu->Heading
    • after update load, last window asks for switching ARCO OFF/ON
    Release notes & download
  21. Version 1.1.C Released Aug 17, 2021 First seen Sep 9, 2026

    Motor LED now lights during menu heading adjustments, azimuth values correctly rounded, device settings fixed. — summary by updatemystuff.com

    Source: microham.com

    Show release notes
    • correctly rounded azimuths returned through control protoco​ls
    • fault DOES NOT MOVE renamed to NO MOVEMENT
    • G-450C (ADC/CDC) renamed to G-450DC(A/CDC)
    • G-650C and G-450C set correctly to AC with​ RHEO
    • green LED for Motor now lits also when buttons used in Menu->Heading
    Release notes & download
  22. Version 1.1.B Released Aug 11, 2021 First seen Sep 9, 2026

    Rotator sensor settings now customizable in non-Custom models; model list updated — summary by updatemystuff.com

    Source: microham.com

    Show release notes
    • on Rotator->Settings, when Model is not Custom, now it is possibl​e to change SensorType, SensorValue and TotalRotation - all these cause warning when ch​anged, and if set to non-default, they are highlighed by red
    • removed YAESU-G450CDC, YAESU-G450ADC renamed to YAESU-G450C (A/CDC)
    Release notes & download
  23. Version 1.1.A Released Aug 10, 2021 First seen Sep 9, 2026

    Source: microham.com

    Show release notes
    • Prosistel ro​tators with potentiometer use the new M-TURN POT option
    • fixed problem with detecting endswitches for Create rotators
    • default pot v​alue for Create rotators changed from 1k to 5k
    Release notes & download

Watch the ARCO for updates

Get an email the moment microHAM publishes new firmware. Just your email — no account or password needed.

More microHAM accessories we track