[Elecraft] question for psk31 users

[KC6CNN]

I am now up and running on psk31. 
I had my power set to 25watts and all is well. If I try to increase it to 30
watts, people say I have side bars. OK not sure what that is, but running 25
watts. 
I see stations that say they are running 50 and even a 100 watts. 
How are they able to run so much power and I get the side bar things at 30
watts. 

Guess I should ask also what are sidebars. lol

Thanks
Gerald - KC6CNN

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