I am not able to tune my K3S on 10 meters to a usable SWR level. But I can with my K2. Here's the comparison:
Power requested: 100W
Antenna: Windom K2 K3S
SWR/Pout: -------> 1.1/96 3.4/47
Clearly the K2 will tune on 10m and the K3S will not. The K3S tunes fine on all other bands. At first I thought it was the antenna which is why I tried to confirm that with the K2, but I was wrong.
All comments are welcomed and appreciated!