Try the internal keyer, just as a test, I think I recall that then the PX3 may 
freeze totally during semi break in keying. (I never used full break in because 
I was using transverters with sequenced relays).

I recall being confused as to what was different one day when I saw what you 
are seeing and it was because I had changed from external to internal keyer or 
vice versa.

73 from David GM4JJJ

> On 3 Aug 2017, at 17:54, Roger Meadows <[email protected]> wrote:
> 
> Noise blankers are off and it is an external key. 
>> On Thu, Aug 3, 2017 at 12:46 PM David Anderson <[email protected]> wrote:
>> I don't have my PX3 beside me now, but I recall that the PX3 acts 
>> differently between using an external keyer and the internal keyer of the 
>> KX3, one freezes the PX3 all the time you are transmitting in semi break in, 
>> the other doesn't.
>> 
>> The other thing that sometimes causes spurious signals to appear on the PX3 
>> is if the PX3 NB level is too high (not the KX3 NB level).
>> 
>> 73 from David GM4JJJ
>> 
>> > On 3 Aug 2017, at 16:53, Roger Meadows <[email protected]> wrote:
>> >
>> > When I'm sending code, I noticed that there is a signal showing up just to
>> > the right of the frequency I'm on. It goes away when I'm done
>> > transmitting.  Here is an example ...  https://youtu.be/zQ_VWCmKvOw
>> >
>> > Thanks for your input.
>> >
>> > 73,
>> > Roger Meadows
>> > AE4RM
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