ACOM 500S firmware v1.7

ACOM · Released Jul 16, 2025 · First seen Sep 7, 2026

Source: acom-bg.com

v1.7 is the latest firmware for the ACOM 500S, released July 16, 2025.

In short — summary by updatemystuff.com

ATU tuning now works with listen-only CAT, improved error handling, mic level fixes

  • ATU tuning support for listen-only CAT
  • CAT command retry logic improved
  • Mic gain handling fixed for TS-990-compatible radios

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

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What's in this update

  • Improve stability d​uring CAT-controlled ATU tune
  • Make the ATU Tune process work with listen-only CAT
  • Fix ATU tune with unidirectional (listen-only) CAT
  • Retry CAT commands only when the radio does not respond
  • Try not to switch to manual tune mode when CAT error detected
  • Do not hardcode 100 mic level​ maximum for TS-990 and similar
  • Properly save the radio mic gain before tuning
  • Always report band number in telemetry messages

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Other versions for this product

See the full firmware history for the ACOM 500S