Changelog

Elecraft firmware changelog

306 releases tracked, newest first.

  1. K3S v3.25 v3.27 Extends VFO tuning to 490 kHz, improves AUTONOTCH, fixes sidetone shift bug.

  2. K3S v3.19 v3.25 Improved noise reduction no longer causes weak signals to vanish; added automatic receiver protection and finer CW tuning steps.

  3. K3S v3.14 v3.19 CW VFO shifts automatically on mode switches, power control locking, bug fixes.

  4. K3S v3.11 v3.14 Adds speaker protection for mono plugs in stereo setup, extends RF frequency range to 24.9 GHz.

  5. K3S v3.10 v3.11 Data submode now restored correctly; fixed sidetone pitch, switch tones, and balance control.

  6. K3S v3.09 v3.10 External CW keying now reaches 100 WPM with pre-enabled PTT; transverter addresses limited to 1-7

  7. K3S v3.06 v3.09 Fixes AFX audio artifacts, improves squelch responsiveness, CW VOX defaults OFF, and preserves RIT/power settings on band changes.

  8. K3S v3.04 v3.06 Faster SSB power output, drive level no longer changes with ATU TUNE, all-mode squelch added

  9. K3S v3.03 v3.04 AGC now offers 15-25 dB IMD reduction option and memory recall preserves per-band settings; other bug fixes.

  10. K3S v1.77 v1.78

  11. K3S v2.82 v3.03 Sub receiver band independence, new AGC options for pileups, and per-band ATU storage.

  12. K3S v2.80 v2.82 AM speech compression added; FM TX deviation and AFSK transmit filter improved.

  13. K3S v2.78 v2.80 AM power stabilized, transmission improved, and manual ATU settings now saved per-band.

  14. K3S v2.76 v2.78 Sign-on banner feature added; SSB split audio, DVR recording, and sub-receiver balance fixed.

  15. K3S v2.73 v2.76 Eliminates power-on noise, fixes SSB filter after VFO swaps, and adds independent sub receiver preamp/attenuator.

  16. K3S v2.63 v2.72 LINE OUT now includes transmit audio; PSK31 passband flatness improved; DVR support added.

  17. K3S v2.72 v2.73 RX EQ applies to both receivers, tune no longer cancels auto-notch, and ADC calibration menu added.

  18. K3S v2.60 v2.63 NORM switch usable during TX, cross-mode SPLIT enabled, and compression range expanded to 0-40.

  19. K3S v2.59 v2.60

  20. K3S v2.57 v2.58 Keypad band switching and band mapping added; VOX disable and message playback fixed.

  21. K3S v2.58 v2.59 Audio tones now available for switches; diversity mode receive control issue fixed.

  22. K3S v2.46 v2.57 SSB power control stabilized, SPLIT now works in diversity mode, PSK31 transmit improved.

  23. K3S v2.45 v2.46 40-meter PA current reduced by correcting low-pass filter configuration

  24. K3S v2.38 v2.45 Added transmit noise gate and fixed coarse tuning synthesis and quantization bugs.

  25. K3S v2.37 v2.38 RIT CLEAR remote command now correctly clears offset instead of copying to VFO A.

  26. K3S v2.36 v2.37 Suppresses spurious error messages during firmware upgrades, especially for older versions

  27. K3S v2.34 v2.36

  28. K3S v2.33 v2.34

  29. K3S v2.23 v2.31 Diversity receive mode, RIT CLR transmit operation with undo, finer CW sidetone, and bug fixes.

  30. K3S v2.31 v2.32

  31. K3S v2.32 v2.33 DSP filter position corrected at certain bandwidth settings; CW sidetone pitch display improved.

  32. K3S v2.22 v2.23 ESSB transmit added for wider SSB bandwidth, LSB/USB equalization improved.

  33. K3S v2.20 v2.22 Channel scan no longer locks small encoders, user-defined settings renamed NORM1/2, flash initialization corrected.

  34. K3S v2.16 v2.20 AGC linearized with lower threshold, audio artifacts eliminated, and UI improved.

  35. K3S v2.15 v2.16 Fixed reversed antenna selections; sub receiver NB/NR/NOTCH controls now working

  36. K3S v2.14 v2.15 Corrected 80m tuning issue causing RX/TX loss; improved sync data mode crystal filter consistency.

  37. K3S v2.13 v2.14 Adds 50 and 100 Hz bandwidths for narrow digital modes; fixes memory recall on 6 meters.

  38. K3S v2.10 v2.13 Adds power-up transmit safety, memory erase, per-mode VFO tuning, and filter distortion corrections.

  39. K3S v2.03 v2.10 Fixed RX/TX dropouts, enabled noise blanker with AGC off, and improved audio gain balance.

  40. K3S v2.02 v2.03 Band change, power reading, and mode commands improved; EXT ALC adjusted.

  41. K3S v2.00 v2.02 VOX now works correctly in CW mode; memory-based channel hopping for 60m works as described.

  42. K3S v1.99 v2.00 Fixes CW speaker noise with headphones, adds transverter band outputs, defaults mic button functions to off.

  43. K3S v1.96 v1.99 Adds per-band power control, receive RFI detection, and RIT on both VFOs when linked; fixes 6m transmit power loss.

  44. K3S v1.94 v1.96 VFO coarse tuning rates adjusted, squelch persists across power, memory verification improved.

  45. K3S v1.88 v1.94 VOX and voice monitor improved; squelch and RF control reconfigured.

  46. K3S v1.87 v1.88 AFX BINO distortion fixed; FM deviation corrected; transverter power limits now enforced.

  47. K3S v1.78 v1.87 Adds FM mode and CW-in-SSB transmission, with automatic power rollback and refined controls.

  48. K3S v1.76 v1.77

  49. K3S v1.75 v1.76 Eliminated TX power spikes, added SQUELCH control, fixed dead RX on band changes

  50. K3S v1.73 v1.75 SSB transmit quality enhanced with higher signal-to-noise ratio, improved compression, and reduced distortion; custom filter slots added.