Elecraft K3S
firmware v4.93
Elecraft · Released Oct 16, 2014 · First seen Sep 14, 2026
Source:
elecraft.com
v4.93 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
PSK63 mode added; K3 no longer locks up with certain powered-off accessories at startup.
- PSK63 data mode now selectable alongside PSK31 using DATA switch and VFO
- Fixed K3 lockup when powered-off KAT500 equipment connected at power-on
- Reduced TX noise from Remote-Rig polling during transmission
Written from Elecraft's release notes, which are printed in full below.
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What's in this update
MCU 4.93 / DSP 2.83
- PSK63 MODE ADDED: To select PSK31 or PSK63, first tap either end of the MODE switch to select DATA, then hold the DATA MD switch and use VFO A to select the PSK data rate.
- KAT500 POWER-ON REMINDER ON K3 DISPLAY: If a powered-off KAT500 is pulling the auxBus signal low when the K3 is first turned on, "TURN ON KAT500" is displayed. Previously this condition would lock up the K3 without explanation.
- K3/0-MINI TX NOISE REDUCTION: Polling by Remote-Rig units is suspended during PTT use to reduce a "ticking" noise heard in some cases.
- Changes to synthesizer, KXV3, and KPA3 device drivers (no effect on normal operation).
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