25.4:1 SWR is what the KX3 reads for a short or an open, if I remember 
correctly.

Agreed, open it up, make sure everything is tight, include the ribbon cable.

wunder
K6WRU
Walter Underwood
CM87wj
http://observer.wunderwood.org/ (my blog)

> On Apr 17, 2017, at 11:20 AM, Don Wilhelm <[email protected]> wrote:
> 
> Nate,
> 
> Since the problem is intermittent, I would not suspect a problem with an 
> active component.
> 
> You might want to remove the bottom cover and check to be certain the 
> hardware on the BNC jack is tight and the LPF on the BNC connector is 
> properly positioned.  You may have to lift the KXAT3 to check - see Figure 43 
> of the KX3 Kit Assembly Manual.
> 
> 73,
> Don W3FPR
> 
> On 4/16/2017 4:55 AM, nate t wrote:
>> Hi,
>> I was working with my KX3 earlier today, RX only, using an endfed, while 
>> running on batteries, RXing WSPR and PSK31.
>> After running for a bit, the ATU seemed to stop working. Attempting to 
>> retune on 40m, it would stick at a 25.4:1 SWR.
>> Tried switching down to 20m and it retuned right away to a 1.3:1. Applying 
>> external power to the unit, I tried tuning again on 40m (battery was 
>> reporting 10V if I recall correctly); It then tuned the end fed up, but only 
>> to a 1.7, which it will typically match to a 1.0:1, it would also get stuck 
>> at the 25.4:1 SWR on some of the attempted tunes.
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