[1000mp] Harmonics on Ft1000MP

[Neal]

I've recently observed ,while transmitting on 80 cw that I have a harmonic
on 40 meter cw  I ran some tests with two local friends here ,and it seems
to be confined to 80 meter cw transmissions only. Nothing wrong when on 75
meter phone or on any other band. I'm using the FT1000MP with a ladder line
center fed ant for 80 meters and an outboard tuner. I've also used another
rig with this antenna and found  no problems with harmonics, so I believe
its in the MP.

Any ideas here about the possible cause and cure ?

Neal N4HAF