Blitzortung shielded ferrite antenne tube end caps
thingiverse
These are end caps for an aluminium 20mm tube for ferrite antennas of the Blitzortung.org lighning flash detection network. This tube shields the antenna against the electrical component of the longwave lighning flash signal. There are some pictures showing an older version of the end cap with hole. The new version has a slot which makes it easier to mount the cap. Tube outer diameter is 20mm, inner diameter 18mm. Used ferrite antennas have 12mm diameter incl. the heat shrink tubing. Drill a little hole for a small tin screw which fixes a short thin ground wire cable. Connect this cable to the ground terminal of the amplifier. Also a clamp is included but never tested or printed!!! I used PLA but in warm regions (above 30°C you should use PETG or anything similar).
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