A short analysis of the HAM Radio HF bands led me to the idea of under sampling the incoming signal and eliminate the mixer altogether here is my rationale The HAM Radio bands are quite narrow in comparison to my ADC Nyquist band (0-Fs/2) Checking the datasheet of LTC2314-14  it seems that is suited for under sampling because it has good full power bandwidth, so in theory is should be feasible to use aliasing in our favor and make the band limited signal to fall in our Nyquis