[aprssig] Gieger counter kit

[david vanhorn]

I have one of the black cat systems, I'm probably one of the stations in
Denver on the map.
:)

It's been working fine for the last five years or so, reasonably
sensitive.  I've seen a GRB event on it, and "rain washout" where
rainstorms bring down various short lived radioactives from gamma ray
interactions in the upper atmosphere.
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