[Elecraft] I/Q details for the KX3.

[JEROME SODUS]

Hello,

Although I have asked some of these questions on another forum, here I have expanded on them a bit. 

When the KX3 transmits a CW-signal, are both I and Q used?
If so, why would that be necessary?
(My guess is only the I is needed.)

Same questions too for a SSB-signal.

But, for any digital transmission like RTTY, FT8, or Olivia, wouldn't both I and Q would be active?  

The LO is used for the "In Phase" and is delayed by 90 degrees for the "Quadrature"; how is that delay done?
How much can the delay deviate from 90 degrees and still be useful?

My reason for asking is that I'm to give a talk to the Radio Club in August about how a KX3 works and want to mention these details.

TIA for any replies.
73 jerry km3k....KX3#6088