My KX3-PX3 (and KPA100) are connected to an iMac also. On the theory that it’s 
the KUSB cable, or the chip in the cable, try swapping the KUSB cable with 
another. Just a thought.
Sure sounds like a software switch somewhere. 

> On Jun 25, 2015, at 2:16 PM, Tom Schaefer <[email protected]> wrote:
> 
> Can you try a different computer?
> 
> Principal Solutions Architect
> Better Software Solutions, Inc. 
> 727-437-2771
> 
>> On Jun 25, 2015, at 4:17 PM, James Bennett <[email protected]> wrote:
>> 
>> I verified that both the KX3 and PX3 are set to 38,400. Nothing has changed, 
>> from an operator perspective: the PX3 has been sitting on my desk, untouched 
>> since the last time I used it a day or so ago. Very frustrating and 
>> disappointing, as I was hoping to use these two units to operate Field Day 
>> this weekend. I can use the KX3 w/o the PX3, but it's not what I had 
>> planned. Maybe someone else will have an idea. If not, I'l call Elecraft on 
>> Friday morning.
>> 
>> Jim
>> 
>> 
>>> On   Thursday, Jun 25, 2015, at  Thursday, 1:05 PM, Jack Spitznagel 
>>> <[email protected]> wrote:
>>> 
>>> Hi Jim,
>>> 
>>> Sounds vaguely familiar. Double check all devices to make sure the port 
>>> speed is set to 38,400 on all devices.
>>> 
>>> I experienced this problem once. When I had the KX3/PX3/KXPA100 daisy 
>>> chained together and one of the speeds was not at 38,400 things went brain 
>>> dead just that way.
>>> 
>>> Jack - KD4IZ
>>> 
>>>> On 6/25/2015 12:37, James Bennett wrote:
>>>> Have a KX3 and PX3 that have been working fine - until this morning. Today 
>>>> I am unable to have the KX3 connect to my computer if the PX3 is powered 
>>>> on. If I turn off the PX3, the KX3 serial - USB connections works fine. As 
>>>> soon as the PX3 is powered on, the connection goes away. I'm using 
>>>> Elecraft-supplied cables, not off-brands. The PX3 Utility cannot connect 
>>>> to the PX3 with the KX3 on or with it off. Other than the connection to my 
>>>> iMac being hosed, the PX3 and KX3 appear to be working just fine.
>>>> 
>>>> Any suggestions how to determine what's going on?
>>>> 
>>>> Tnx, Jim / W6JHB
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