[hpsdr] Mercury input protection

[stoskopf at tri.net]

Guess my query was about possible IM in the area between the full standoff
area and the break over area.  That would be in the strong signal (single
signal or sum of input passband) area and might result in limiting
usefulness of the full DR.  Any change in device C would be largely
swamped by whatever tuned circuit or matching C from the filter I would
use in front of it.  Just nit picking on a great module.  Thanks,  N0UU
>
> The protection of a diode in series with a zener only adds a little C to
> the input. It will have no effect on performance as long as the diode and
> zener are not forward biased. The Diode isolates the high junction C of
> the zener from the input. Cheap insurance and yes it is nice to see a
> little isolation amp ahead of the A/D.
>   I belong to HPSDR for one reason, performance. Take your time TAPR and
> get it right.
>   Nice to get a status report though. Frank WA1GFZ



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