[Elecraft] K2 power problem with FT8

[Markku Siipola]

I have started to use my K2 for FT8, with the KIO2 digital interface and 
the SSB-module. My sound card is connected to the hear phone and 
microfon connections. Software WSJT-X, JTAlert and DXLab commander.

On 80m and 40m all is ok, but not on the higher bands. For example on 20 
m, the power is reduce very much for certain LF frequences. I tested 
this by using the TUNE function in WSJT-X and changing the TX frequence.

LF    Power

400    7
500    3
600    3
700    4
800    7
900    7
1000    7
1100    7
1200    7
1300    4
1400    2
1500    1 <---
1600    1 <---
1700    2
1800    3
1900    5
2000    7

The same problem is also on the remaining high bands

What can be wrong?

73 de SM5FLM