Elecraft K3S
firmware v5.20
Elecraft · Released Mar 30, 2015 · First seen Sep 14, 2026
Source:
elecraft.com
v5.20 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
Menu enhancements and FA/FB remote commands extended to 100 kHz.
- Menu selections correctly restored when accessed via switches
- CONFIG:VFO LNK toggles when assigned to switches
- Remote frequency control extended to 100 kHz
Written from Elecraft's release notes, which are printed in full below.
Was this useful? Thanks.
What's in this update
MCU 5.20 / DSP 2.83 / FPF 1.21
- MENU IMPROVEMENTS: (1) CONFIG: VFO LNK will now alternate between ON and OFF when assigned to a PFx or Mx switch. (2) The KNB3 is required for operating the radio, and there are no configuration settings, so this entry was removed. (3) Accessing menu entries via PFx/Mx switches now correctly restores the operator's last-used MAIN and CONFIG menu selections on exit.
- VCO CAL (FOR KSYN3) DISABLED IF KSYN3A DETECTED.
- FA & FB REMOTE-CONTROL COMMANDS WORK DOWN TO 100 KHZ WITH KSYN3A. Note that a KBPF3 module is required to use the K3 below 160 meters. Sensitivity is then quite good (-125 dBm) down to about 400 kHz, although it falls off below that. For example, 250 kHz MDS is about -90 dBm.
updatemystuff.com never hosts firmware files — always download from the official source.
Get it from ElecraftWatch the K3S for updates
Create a free account and get an email the moment Elecraft publishes new firmware.
Create account & watch