KAT500 Software Page

See the bottom of this page to get the latest KAT500 Utility. 

Beta Firmware Revisions

MCU 1.75, April 26, 2016

Only the current production firmware release can be downloaded by KAT500 Utility automatically.

Browse KAT500 Beta Firmware FTP Folder

  • When ATU's frequency is set with F, FA, or MT commands, update TX frequency counter from the command rather than waiting for next transmission. Avoids switching to the ATU settings for the old TX count frequency on next TX before the TX frequency is counted.

  • When Memory Recall Tune in Manual and Auto are off, don't retune on band switch frequency count.

  • Add FCCS (Frequency Count Continuous Sample time) command to influence frequency counter inertia. Lower values cause the KAT500 to more quickly accept a new frequency count, higher values make the KAT500 less willing to move. This is likely to make the most difference in SSB.

  • Use KAT500 command tester: FCCS; to query. FCCS nn; to set. Default is 12 msec.


Current KAT500 Firmware Revisions

MCU 1.67, March 12, 2014

This release can be automatically downloaded by KAT500 Utility.tility.

See KAT500 Firmware Release Notes for a complete revision history.

KAT500 Utility or newer. See downloads below.


FAQ: Consolidated Release of K-Line Firmware
(How to setup VFO Tracking for your KAT500 and K3)

  • Change to avoid early search termination by a transient SWR dip. Pause for exciter fold back recovery and average over more coupler samples when tuner setting is "best so far" or reaches "stop tune" threshold. Tuning stutters a bit, but sometimes a better tuning solution is found.

  • Experimental change to Icom AH-4 Start to perform Auto Tune to avoid full search tune on each Icom TUNE button press

  • Perform memory recall tune on transition from mode BYP to MAN or AUTO

  • Speed up some tunes



KAT500 Utilities and Drivers for Windows, Mac and Linux

Use this software to load the latest firmware into your KAT500 

Minimum Operating System Requirements for Elecraft Utilities:

Microsoft Windows: XP Service Pack 3 or later, including Vista, 7, 8, and 8.1.

Apple Mac: OS X 10.6 (Snow Leopard) or later

X86-based Linux: GTK+ 2.8 or later, glibc-2.4, libstdc++.so.6 and cURL. 64-bit Linux requires 32-bit compatibility libraries.


KXUSB Drivers:


KAT500 Utility:

After completing a new firmware download to your KAT500, please power cycle it OFF and then back ON before using it.