[Elecraft] KX3 radio settings for WSJT-X

[Rick Bates, NK7I]

That is clearly a case of RFI; the USB connection is 'sensitive' at that 
frequency range.

Your clue is:  "
then settle down quietly to about 100W.
2.  Around the same time Windows reports "USB device not recognized" and 
the mouse cursor disappears.  "

If it doesn't happen at low wattage but does at higher is your hint; 
you're getting RF back into the shack, which is never a good thing.

Presuming that ALL your equipment is properly bonded AND grounded (not 
the same thing), adding some ferrite to the cabling (begin with the USB 
cable) would be a good place to start.

If you are not completely bonded and grounded, start there first (it can 
also lower the noise floor so you can hear better too).

73,
Rick NK7I


On 8/27/2020 9:41 AM, David Haines wrote:
> Here are more details:
>
> All seems to be working fine on 160m-10m except for 17m, so KX3 VFO is 
> at 18.100 for the rest of this discussion.
>
> Without WSJT-X running, ATU finds a 1.1 match and TUNE button on KX3 
> works as expected.
>
> With WSJT-X running, using the WSJT-X TUNE button causes the following:
>
> 1.  KXPA100 power LED's light from left to right _twice_, in 
> synchronization with a musical ringing that rises in frequency, then 
> settle down quietly to about 100W.
>
> 2.  Around the same time Windows reports "USB device not recognized" 
> and the mouse cursor disappears.   At this point different things can 
> happen:  Maybe the cursor comes back and I can stop the TUNE at 
> WSJT-X.  Maybe it doesn't and I have to shut off the KX3 with XMIT 
> button.  Sometimes the PC freezes and needs a hard reset.
>
> 3.  The KXPA100 fault table lists no faults.
>
> Anybody seen anything like this?
>
> david, KC1DNY, KX3 #08651
>
>
> On 8/26/2020 7:59 PM, Don Wilhelm wrote:
>> David,
>>
>> It is a mystery why the computer reports that message only on 17 
>> meters.  There should be no band dependency for the USB connection.
>>
>> 73,
>> Don W3FPR
>>
>> On 8/26/2020 7:02 PM, David Haines wrote:
>>> I've had good luck setting up my KX3 for FT-8., but it took awhile. 
>>> I used several good sources which I'm sure other will point you to. 
>>> But here's my current issue:
>>>
>>> I'm regularly getting FT-8 QSOs on 40m, 20m, and 10 m with no 
>>> problems. The other night I decided to try 17m.  My Windoze computer 
>>> replied "USB device not recognized."  HUH?
>>>
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