KPA1500 Software Page

Current Production Firmware

MCU 1.28 March 15, 2018

All KPA1500 amplifiers ordered today will have Product Firmware loaded as they come out of the box. Monitor the Elecraft Email Reflector where announcements are made when new releases become available.

Elecraft delivers new features in firmware. As a result, you should consider the Release Notes as an extension of the Owners Manual. Documentation for the new features will be found there and will not appear in the Owner’s Manual until the next major manual revision is released.

Current Production Firmware Release Notes

01.28 3-14-2018

  • Force frequency counter inertia to a minimum of 7

  • Change minimum frequency count from 1500 to 1700 kHz

  • ATU HiSWR retune is now per-band. Use KPA1500 Utility version for configuration

  • ^HS command altered for per-band ATU HiSWR, see KPA1500 Programming Reference

  • Increase time-to-fault for input power, SWR bypass power and frequency count error.

  • Reduce frequency counter jitter.

  • Change frequency counter granularity from 1 to 8 kHz, improving counter reliability

  • Remove three frequency counter menu items

  • Bug fix: ATU HiSWR retune was broken

  • PHY (Ethernet LAN) interrupt no longer turns on power

  • Reduce fault alarm tone duration from 3 seconds to 1 second

  • Change factory relay cleaning command to always bypass PA

  • Change factory wattmeter calibration starting values

Important - Please read before installing the latest Production Firmware

There is no special instructions at this time.

Production Firmware Installation Instructions are found in the Utility

  • All Production Firmware is loaded with the KPA1500 Utility. It will take care of the download and installing Production Firmware
  • Before loading Production Firmware, please ensure you have installed the latest version of the KPA1500 Utility.
  • See the Help → Getting Started pull-down menu in the KPA1500 Utility for the steps to install firmware in your KPA1500.

Download and Install the KPA1500 Utility for your Operating System

Follow the links below to download and install the latest version of the Utility for your Operating System. You will be using the USB A-to-B cable that was shipped with the KPA1500.

Minimum Operating System Requirements for Elecraft Utilities

Microsoft Windows: XP Service Pack 3 or later, including Vista, 7, 8, and 8.1 and 10.

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

WindowsKPA1500 Utility (Windows Version March 15, 2018
MacIntosh Not yet available
X86 LinuxNot yet available
Installing the FTDI driverFollow this link to the FTDI Site for drivers:

Depending on the Operating System you have, the driver needed for the Utility to communicate with the KPA1500 will need to be loaded.

All Elecraft products in production use the FTDI chipset for this function. The FTDI driver allows your computer to create a virtual COM port so that the Utility can communicate with the Elecraft product.

Beta Firmware Installation and Release Notes

Beta Firmware Release Notes

There is no Beta firmware candidate at this time.

Beta Test Firmware Installation Procedures

NOTE: Beta test firmware may have new issues that we haven't caught during field testing. Please report them to

A little more detail

We make it a little harder to load Beta firmware mainly because we want you to be sure you want to do this. Beta firmware means that, while the KPA1500 engineering team has fully tested the firmware, it has not yet been deemed ready for Production status. You can always return to the last firmware you have downloaded by following the steps in the KPA1500 Utility’s Help section.

To load Beta Firmware, follow the steps below:

  1. Create a new folder for the beta firmware on your Desktop or some other easily found location. Use the a different folder than the default folder found in the Firmware tab of the KPA1500 Utility. In this way, you can revert to the last Production firmware easily.
  2. Now, we will download the firmware in Zip file format. In a web browser, type in this URL:
    If you do not see the correct version of the zip file, press the RELOAD / REFRESH button on your browser to update your browser cache.
  3. Right-click on the .zip file containing the beta firmware (e.g. for revision MCU X.YZ and all associated files). Save the file to your beta folder you just created.
  4. Unzip the files into the beta folder.
  5. Enter the path to the beta folder in KPA1500 Utility → Firmware tab → "Local folder for firmware files".
  6. After you have made the change in Step 5, make sure you *DO NOT* check the KPA1500 Utility box titled "Copy new files from Elecraft server". This will overwrite the Beta firmware if clicked.
  7. Connect the KPA1500 to your computer and be sure it is turned on. Select the Firmware tab and Click on "Check versions now" button.
  8. Review the release notes. To find them, select the "Help" pull-down menu.
  9. Click "Send all firmware to KPA1500." This will cause the firmware to be sent to the KPA1500. You will see that the KPA1500 appears to restart itself. Monitor the Activity Log until it is complete.
  10. After completing a new software download to your product, please power cycle the KPA1500 OFF and then back ON before using it.
  11. Please report any new firmware issues to