PTT KEY setting not Sticky upon reboot power cycle. See Manual ERRATA;
https://ftp.elecraft.com/K3S/Manuals%20Downloads/E740258E%20K3S%20Owner's%20man%20errata%20A1-2.pdf
PTT/KEY USE WITH THE USB PORT IMPROVED: Some PC applications can control
PTT and KEY at the K3S via the RTS/DTR signals of the USB port. However,
use of these signals may also allow the PC’s USB port initialization to
unexpectedly activate transmit at the K3S. This can happen if the
computer is turned on after the K3S, or if the USB cable is not
connected. There is now a "Safe" mode (the default) which disables
PTT-KEY transmit until the K3S receives a command via USB, such as a
read of the rig's VFO frequency. To turn on safe mode on/off, go into
CONFIG:PTT-KEY and tap '1' to select "USB SAFE" or "UNSAFE". Exit the
menu and turn the K3S off/on. Applications that use PTT KEY via USB but
never send commands may require "UNSAFE" mode. In this case, unwanted
transmit can be avoided by turning the PC on before the K3S
Keith WE6R K3/K4 Tech
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