microHAM ARCO firmware `v4.0.A`

microHAM · Released Apr 26, 2024 · First seen Sep 9, 2026

v4.0.A is not the latest firmware for the microHAM ARCO: the current version is v4.2.B (January 3, 2025). Go to v4.2.B

In short — summary by updatemystuff.com

Added moon and sun tracking, S75A rotator and brake driver support, and configuration transfer.

Written from microHAM's release notes, which are printed in full below.

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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 presets 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

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