[Elecraft] Spectrum not clean.

[Jesus L. Paleo]

My K2 is full operative since 10-febr, today I decide to see in the 
spectrum analizer how clean is the output and check the power output in 
a calibrated power meter.
The K2 has the ATU inside, so aditional filter in in line with the output.
Power is 13.2W from 3.5 to 18, down to 12W at 21Mhz, 6.5 at 24Mhz and 7 
at 28.
The spectrum has 2 spurious signals at 21 Mhz, up and down the carrier 
there are 2 signals 45 db down and spacing 1.41Mhz from carrier.
At 24 Mhz spurius are up and down too, -43 db from carrier an spaced 312 
Khz.
At 28 Mhz sigs are -53 db down and spaced 484Mhz.
Spectrum in the other bands down 21Mhz was very clear.

Any idea about how to eliminate or reduce this spurious signals, and get 
some more power at 24 and 28Mhz ?


Thanks. Jesús, EA1DAV.