[Elecraft] [K3S] Radio transmits when computer powered on

[Don Wilhelm]

Jim,

What is the firmware level of your K3/K3S?
If it is 5.33 or later, there is a SAFE/UNSAFE mode for PTT-Key.  An 
excerpt from the 5.33 Firmware Release Notes is below:

* PTT/KEY USE WITH THE USB PORT IMPROVED:  PC applications can activate 
PTT and KEY at the K3S via the USB port's RTS/DTR signals. However, 
initial setup of the rig's USB port by the PC may cause pulsed or 
continuous activation of the transmitter. 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.

73,
Don W3FPR

On 7/22/2018 5:07 PM, Jim N7US wrote:
> I've lost track of the (menu?) setting that prevents the K3 or K3S from
> going into TX when the attached computer is powered on.  The radio goes into
> TX two or three times when the computer starts.
> 
>   
> 
> 73, Jim N7US
> 
>   
> 
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