It's Summer Sale Time! Material shortages affecting companies worldwide...including Elecraft. Please see our Shipping Status page for updates.

K4 High Performance Direct Sampling SDR Software

Current K4 Production Software  

K4 / Release 13 / 5-12-2021

K4 Production Software - General Information

  • K4 software updates are handled at the radio itself.  An ethernet connection is required to obtain new software. It is also possible to load (or re-load) software from a USB flash drive. For further information on that topic, please refer to the K4 Operating Manual.
  • The K4 provides new features via software.
    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 manual revision is released.

Current K4 Production Software Release Notes  


PANADAPTER SPECTRUM TRACE VISIBILITY: The spectrum trace is now positioned in front of the VFO cursors to improve visibility.

KREF4 FIRMWARE LOAD: Corrected a problem with release 12 that could cause KREF4 firmware to load incorrectly.

PANADAPTER FREEZE: Fixes a case where the panadapter randomly freezes, typically after hours of operation.

FLASH DRIVE IN FRONT USB JACK: Improved compatibility between most USB flash drives and the front USB jack.

AM AND FM TX: Transmit is now on frequency in these modes.

FOR SOFTWARE DEVELOPERS: Added TQ command GET. Improved TU command handling.

  • See K4 Software Release Notes for complete revision history.