Try disconnecting and reconnecting all connections.

I work in telecom and for years I had been told that a cable cannot go bad just 
lying in a cable tray. Well, I discovered that isn’t true. It can go bad all on 
its own just lying in a cable tray screwed down at both ends. No one knows what 
happened and there was no physical damage to the cable.

Also, jacks will get dirty. There is a fix for a DSX cross-connect (it’s for T1 
testing and patching) where you insert and remove a bantam cable several times. 
It’s surprising how often this “fix” works.

73,
Joel - W4JBB

> On Jun 25, 2015, at 4:45 PM, James Bennett <[email protected]> wrote:
> 
> Tried it. In fact, not only did I try the one that connects to my K3/P3, I 
> tried a spare that I use occasionally for my KAT500. Neither of the three 
> allow the PX3 & KX3 pair to work if the PX3 has power. If I power off the 
> PX3, then the KX3 signal flows to the iMac like it did yesterday. 
> Arrghhhhh....... :-(
> 
>> On   Thursday, Jun 25, 2015, at  Thursday, 2:39 PM, David Ahrendts 
>> <[email protected]> wrote:
>> 
>> 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] 
>>> <mailto:[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] 
>>>> <mailto:[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] <mailto:[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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>> 
>> 
>> 
>> David Ahrendts   [email protected] <mailto:[email protected]>   
>> 
>> 
>> 
>> 
> 
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