I am using BasicTX daughterboard to generate a VHF signal around 228MHz.
For this a complex signal is generated at -28MHz leading normally to
harmonic components at
256-28MHz=228MHz (wanted signal)
However looking at the spectrum (see attached), I still see powerful
Is it normal or is is a missconfiguration from my side or an I/Q gain
Is there a way to avoid these 156 and 284MHz components ? (they are hard
to filter compared to other one actually)