Elecraft K3S
firmware v5.13
Elecraft · Released Feb 24, 2015 · First seen Sep 14, 2026
Source:
elecraft.com
v5.13 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
Fixed receiver frequency drift and data sub-mode sync bugs; added DVS command for simultaneous diversity control
- KSYN3A communications error causing receiver drift fixed
- DVS host command added for diversity and sub receiver control
- Data sub-mode command corrected to sync both VFOs
Written from Elecraft's release notes, which are printed in full below.
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What's in this update
MCU 5.13 / DSP 2.83 / FPF 1.19
- KSYN3A CONTROL BUG FIXED: On some K3s, a communications error would sometimes occur between the main MCU and KSYN3A, leading to either the main or sub receiver being off frequency. This has been corrected.
- TURNING DIVERSITY OFF DOESNT TURN OFF THE SUB RX: This applies to both a hold of the SUB switch and the DV0 host command. The sub must be turned off by tapping SUB. (Also see next item.)
- NEW "DVS" HOST COMMAND: This variation of the DV command turns both diversity and the sub RX on/off at the same time. This is useful for operators who want a single switch macro to quickly alternate between sub with diversity ON and sub OFF. Use K3 Utility to create a switch macro, then assign it to a programmable switch using CONFIG: MACRO n.
- "DT" HOST COMMAND FIX (data sub-mode): The DT set command to select the DATA submode for VFO A now correctly sets the same submode for VFO B.
- RF board device driver updates. No effect on normal operation.
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