Elecraft KPA500
firmware v1.29
Elecraft · Released Feb 13, 2013 · First seen Sep 14, 2026
Source:
elecraft.com
v1.29 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 Auxbus hang on shutdown and added serial command for Power On Operate
- Fixed Auxbus not completing on shutdown
- Added ^PO; command for serial control of Power On Operate
- Fixed serial I/O becoming disabled during EEPROM writes
Written from Elecraft's release notes, which are printed in full below.
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What's in this update
- Corrected problem with Auxbus not completing transmission on shutdown thus keeping power-off hanging, waiting for the Auxbus to complete. This only occurred if Auxbus was active when user pressed power button to shut down.
- Found and corrected a situation where faulty ADC reads would occur. Such reads are now properly ignored.
- Improvement with SWR fault checking code.
- Added ^PO; command to enable / disable Power On Operate from serial control. The format of the command is:
^PO; - gets the state of the parameter. ^POn; - sets the state of the parameter. n = 0 to disable, 1 to enable. The response is: ^POn; where n indicates the parameter state, 0 = disabled, 1 = enabled.
- An inbound serial character while eeprom was being written could cause serial IO to become disabled. This is now corrected with an improved EEPROM write function that causes interrupts to be disabled for an absolute minimum time.
- Improved power-on algorithm for K3 state detection. We still have anomalies with the K3 off in that it gives a band indication of 60 meters when off. We now properly detect power on conditions and handle them properly.
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