One other thing, have you perhaps got the PX3 Noise Blanker switched on and the 
PX3 NB level turned up high? That causes spikes at the centre.  (I am not 
referring to the KX3 noise blanker) 

73 from David GM4JJJ

> On 16 Jul 2017, at 23:06, Dave Sublette <k...@arrl.net> wrote:
> 
> I have had my PX3 for a little over a year (I think).  It has been used 
> sparingly.  Until this afternoon, it has worked perfectly.  Now I see a spike 
> in the center of the display and periodic spikes across the entire screen. 
> Almost all are symmetrical in frequency and amplitude about the center line. 
> There are some that are not symmetrical.  I have plugged and unplugged all 
> the cables, taking care to see that each is fully into the socket.
> 
> So, perhaps I have a failure that requires returning to Elecraft?  Have any 
> of you had the same experience?
> 
> 73,
> 
> Dave, K4TO
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