[hpsdr] Mercury input

[Lyle Johnson]

Mercury has a transient suppressor on the input, a switchable attenuator 
followed by transformer coupling to a preamp (LTC6400), so the ADC is 
fairly isolated from the input.

73,

Lyle KK7P

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> Hi All,
> Sounds like Mercury could use a 1:1 BB transformer on the input. I would 
> wind one with 50 ohm coax. Primary the shield and secondary the center 
> conductor. I have wound transformers that work 160 m to 6 m with type 61 
> core material. Below 160 meters would require a second transformer with 
> higher perm material. I would think a good ESD or lightning transient 
> could also trash the input.   frank WA1GFZ
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