[TenTec] Orion-II 15m TX Spur?

[Trevor]

During the checkout of my new O-II I observed a significant spur on 
11.8mhz while transmitting on 21.105mhz
under the following conditions:

Barefoot - no linear amp.
"Out of the box" default settings - both VFO's on 21.105mhz - mode LCW 
on both - (A or B has the same spur)
Tune - advance power level  from 1w to 55w spur is ~30db down - spur 
disappears at 50w through 100w.

With amp (SB-220 or HF-2500) at 1kw there is no 11.8mhz spur  however 
should I wish to run QRP or reduced power up to 55w barefoot I have the 
spur.
My spectrum analyser is 3 feet away from the rig so I took it to another 
part of the house and saw no difference in the spur amplitude.

Anyone else see this? No spurs found on any other bands but have'nt 
completed my checkout yet.

-Trevor AB5EU