MCU 5.29 / DSP 2.83 / FPF 1.22, 6-16-2015
Latest Production Release
IMPORTANT: MCU 4.67, or later, must be loaded with the new K3 Utility, Version 1.13.5.9 or later.
This release will automatically be recognized by K3 Utility.
See K3 Firmware Release Notes for a complete revision history.
Note: For KPAK3AUX cable use between the KPA500 and K3, K3 Version 4.36, or later, must be loaded.
Those loading rev. 5.10 (or later) for the first time must re-do the 50-Watt gain calibration step on all bands. Once this has been done, there is no need to do it when loading future firmware releases.
NOTE: Beginning with revision 5.26, the K3S and K3 transceivers share the same firmware. Both use K3 Utility for firmware loading. However, some firmware features and changes apply only to the K3S and various updated internal modules, as described in the rev. 5.26 release notes. For further details, refer to the K3S owner's manual.
* EXTERNAL ALC DEFAULT FIXED: External ALC (CONFIG:EXT ALC menu entry) was being set to ON at first-time power-up. It now correctly defaults to OFF. Any K3S first powered-up with rev. 5.26 should be checked for the correct setting (normally done at the factory). Set to OFF unless external ALC is in use.
* ADC REFERENCE DEFAULT FIXED: The A-to-D converter reference setting (CONFIG:ADC REF menu entry) was left uninitialized at first power-up, possibly with a value that could adversely affect the accuracy of power, SWR, and other readings. Any K3S first powered-up with rev. 5.26 should have ADC REF recalibrated (normally done at the factory).
http://www.elecraft.com/K3/k3_software.htm