Elecraft K3S
firmware v3.79
Elecraft · Released Mar 5, 2010 · First seen Sep 14, 2026
Source:
elecraft.com
v3.79 is not the latest firmware for the Elecraft K3S: the current version is v5.67 (January 22, 2019). Go to v5.67
In short — summary by updatemystuff.com
RX antenna can now be switched during transmission; eliminated spurious error messages on startup.
- RX antenna switch allowed during transmission for signal comparison
- Spurious error messages eliminated from power-up
Written from Elecraft's release notes, which are printed in full below.
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What's in this update
MCU 3.79 / DSP 2.54
- RX ANT SWITCH ALLOWED DURING TX. This is useful if you need to compare signal strength of received signals while sending a repeating CQ message in CW mode.
- SPURIOUS ERR XXX MESSAGES ELIMINATED: On rare occasions operators have seen multiple error messages such as ERR BP1, ERR LPF, etc. on power-up. This was caused by a timing error when communicating with SPI-bus devices, such as the shift registers controlling band-pass and low-pass filters.
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