Elecraft KPA500
firmware v1.21
Elecraft · Released Dec 23, 2012 · First seen Sep 14, 2026
Source:
elecraft.com
v1.21 is not the latest firmware for the Elecraft KPA500: the current version is v1.54 (December 17, 2017). Go to v1.54
In short — summary by updatemystuff.com
Fixed K3 power-on detection and AuxBus command handling when K3 powers up after KPA.
- K3 power-on detection fixed when K3 powered on after KPA
- Proper AuxBus command sending on K3 power-on
Written from Elecraft's release notes, which are printed in full below.
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What's in this update
- K3 powered on after KPA now works properly. KPA properly detects K3 power on and sends AuxBus commands as needed.
Note that the previous version (V1.20) was misidentified in the release notes that accompanied it as V1.19. This was also corrected here.
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