Its only  single tone , no  intermod  products , don't matter where the  alc is set,  that's  harmonics  , due to the  aggressive  tone switching ,  mfsk  produces a  similar set of sidebands ,  but not  as bad ,,  wspr2  makes the same , but the  rate is  slow, so no one notices ..interesting  arrl  have issued a statement  , stating its not  compatible  with there  data  award's ?

73-Graham
G0NBD