Elecraft K3S
firmware v3.10
Elecraft · Released Apr 15, 2009 · First seen Sep 14, 2026
Source:
elecraft.com
v3.10 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
External CW keying now reaches 100 WPM with pre-enabled PTT; transverter addresses limited to 1-7
- CW keying reaches 100 WPM with pre-enabled PTT
- Transverter auxBus limited to addresses 1-7
Written from Elecraft's release notes, which are printed in full below.
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What's in this update
MCU 3.10 / DSP 2.15
- FASTER EXTERNAL CW KEYING SPEEDS : When transmit is pre-enabled using PTT (i.e., with a footswitch or with PTT under computer control), external keying speeds up to 100 WPM are now possible. (When using CW with VOX, the recommended maximum is still 60 WPM.) Notes: (1) If you use a computer to control PTT, and wish to do this via the K3s serial I/O jack, refer to the CONFIG: PTT-KEY menu entry.
(2) The maximum attainable CW speed may be lower during heavy use of RS232 polling. Also, higher settings of the transmit delay menu parameter (CONFIG: TX DLY) will also reduce maximum CW speeds.
- TRANSVERTER BAND DECODE CHANGE: The K3 can control up to 9 transverter bands via either a serial output (auxBus) or parallel (BAND0-3). The parallel outputs can select all 9 transverter bands, but the auxBus is now limited to addresses 1-7, matching Elecrafts XV-series transverters. (In all cases, use CONFIG: XVn ADR to specify the address.)
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