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

[EricJ]

It's not a K3 "feature" either. It happens with my K2 for the same 
reason. The computer tests the serial port and if the K2 is on, the PTT 
gets keyed. No fix other than to put the rig in Test or turn it off when 
booting the computer.

Eric
KE6US

On 4/16/2013 11:52 AM, Don Wilhelm wrote:
> 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.
>>
>>
>
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