[Elecraft] PX3 - odd 'missing' signal

[David Orman]

I've noticed on various modes/combinations of spans, I show some what look
like null regions. Sometimes it's right where I'm tuned, sometimes it's
offset. In this picture, I am tuned to 14.055.050, in CW mode, span is 2,
and there is a deep null area centered somewhere around 14.056.05.

In some modes, this is troublesome, especially when it's right on the
cursor where I am tuned. I must be doing something wrong, so would
appreciate any feedback you can give me regarding this / how to fix it.

Here's an image showing what I am talking about:
http://ormandj.corenode.com/images/radio/elecraft/px3-null.jpg

Thank you
David