> ## Interesting. So other than the –42 db harmonic suppression, what > else is > required to make an HF amp meet FCC technical requirements ? > > Jim VE7RF As far as I remember, no more than 15 dB gain and no gain between 26 and 28 MHz. If DX5 meets those requirements, it could be authorized by FCC as far as the max power is out of question. 73, Val LZ1VB