[hpsdr] Front End protection

[FRANCIS CARCIA]

I don't know which Greek God guarded the gate but how are we going to protect this fast A/D from static and lightning transients? Racal used an interesting active limiter ahead of the RA6830 because the older RA6790 had real bad burnout problems with the FETs in the first mixer. I would think we need more than a NE2 across the input.  Frank WA1GFZ
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