[Elecraft] question on old topic K3 Key-down on power-up [Solution?]"

[Don Wilhelm]

Lee,

That behavior is NOT dependent on when the K3 is powered up - unless the 
K3 is powered on only after the computer completes its boot cycle and 
the OS is loaded.

It does happen every time the computer boots - the computer port testing 
will activate the DTR and RTS lines for a short time.
There is nothing in the K3 that can prevent that from occurring.

Yes, if you have the K3 menu set to use DTR or RTS for PTT or keying, it 
would be a good idea for you to place the K3 into TX TEST whenever the 
computer is powered up.

73,
Don W3FPR

On 4/16/2013 1:55 PM, Lee Hill wrote:
> Hi:
>
> I recently purchased a used K3.
>
> I have noticed the exact problem described in posts in 2008,
> http://marc.info/?l=elecraft&m=121462133723056&w=2
>
> where the K3 goes into transmit due to a connected computer's serial port
> -  when the computer first powers up and the serial port has not yet been
> configured by a logging or serial control program.
>
> The undesired behavior stems from the K3 PTT being asserted by the computer
> at the rig's serial port via DTR or RTS (depending on the K3 setup) The
> problem goes away after the logging or serial port control program is
> launched.
>
> Was a feature discussed in the above post implemented in later firmware?
>   The feature is the rig detects an asserted PTT during the first couple of
> seconds of power up and goes into TX test mode and/or displays and error.
>
> I haven't done any HW or firmware upgrades to the rig yet.
>
>